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Earth of fire

Actualité volcanique, Articles de fond sur étude de volcan, tectonique, récits et photos de voyage

volcanic activity

Publié le par Bernard Duyck
Publié dans : #volcanic activity
Mauna Loa and nearby habitable areas - photo USGS/ Volcano watch - one click to enlarge

Mauna Loa and nearby habitable areas - photo USGS/ Volcano watch - one click to enlarge

Mauna Loa worries!

Recent events at Mauna Loa remind us to be prepared for rapid change.

The rapid onset of extreme unrest leading to the 1984 eruption is typical of Mauna Loa eruptions that have been observed over the past two centuries.

Mauna Loa - ancient eruptions and forecasts in terms of days, weeks; month - Doc. USGS - - one click to enlarge

Mauna Loa - ancient eruptions and forecasts in terms of days, weeks; month - Doc. USGS - - one click to enlarge

Mauna Loa's last eruption occurred in 1984 and began in typical volcano style. At 10:55 p.m. on March 24, 1984, the rate of earthquakes beneath Mauna Loa began to increase rapidly. While earthquake rates were already above normal, they quickly increased to 2-3 earthquakes per minute.

At 11:30 p.m., a strong tremor had begun, indicating that the magma was moving underground and approaching the surface. The eruption began atop Mauna Loa at 1:30 a.m. on March 25.

 

The current episode of Mauna Loa unrest began in late 2014 with increased rates of inflationary deformation and seismicity. These rates declined in 2017-2018, but started to increase again in 2019 and have remained somewhat stable since then, with earthquake rates around 20 per day. A notable seismic swarm occurred from late January to mid-April 2021 and was accompanied by changes in ground surface tilt recorded by a summit tiltmeter. This was an unprecedented observation that indicated magma was approaching the surface. Another short swarm and tilt event was observed in early August 2022.

There were less than 20 earthquakes per day (blue bars) from early August to mid-September. The rate has increased to around 40 to 50 earthquakes per day for the past two weeks, with peaks of over 100 earthquakes per day on September 23 and 29. (USGS).
The current and ongoing swarm began on September 22, 2022, and marked the beginning of a persistent increase in the earthquake rate at Mauna Loa's summit. It went from around 20 a day to 40-50 a day, with two days reaching 100 a day. The shallow opening (less than about 2 miles or 3 kilometers deep) of the magma lanes has also been detected as an inflationary tilt event.

Mauna Loa monitoring data from the Hawaiian Volcanoes Observatory showing increased ground deformation rates (top) and earthquake rates (bottom) from August 8 to October 5, 2022. The distance (length of the line) between the MOKP and MLES GPS stations (blue circles) elongated by about 2 cm (less than 1 inch), indicating that Mauna Loa is expanding as more magma accumulates below the surface. MOKP is located just northwest of Mokuʻāweoweo (the summit caldera of Mauna Loa) and MLES is located on the upper southeast flank of Mauna Loa. Tiltmeter measurements (green line) also show increased ground motion - USGS

Mauna Loa monitoring data from the Hawaiian Volcanoes Observatory showing increased ground deformation rates (top) and earthquake rates (bottom) from August 8 to October 5, 2022. The distance (length of the line) between the MOKP and MLES GPS stations (blue circles) elongated by about 2 cm (less than 1 inch), indicating that Mauna Loa is expanding as more magma accumulates below the surface. MOKP is located just northwest of Mokuʻāweoweo (the summit caldera of Mauna Loa) and MLES is located on the upper southeast flank of Mauna Loa. Tiltmeter measurements (green line) also show increased ground motion - USGS

Last week, about 430 small-magnitude earthquakes were recorded below the summit and upper flanks of Mauna Loa, the majority of them occurring at depths less than 15 kilometers below sea level. Global Positioning System (GPS) measurements show continued ground deformation consistent with swelling of a magma chamber beneath the summit. Gas concentrations and fumarole temperatures at the summit and at Sulfur Cone on the southwest rift zone have remained stable over the past week. The webcams show no change in the landscape.

Mauna Loa is not erupting today, and remains at the ADVISORY Volcanic Alert Level. This alert level does not mean that an eruption is imminent or that progress to an eruption from the current level of unrest is certain.

The alert level for Mauna Loa remains at advisory / yellow.
Beginning October 6, HVO will change UPDATES for Mauna Loa from WEEKLY to DAILY, reflecting the increased level of unrest.
HVO continues to monitor conditions carefully and will post appropriate updates if conditions change.

 

Source: USGS – Volcano watch- Recent events at Mauna Loa remind us to prepare for rapid change

Nishinoshima -activity as of 08.09.2022 - image sentinel-2 zoom / Copernicus - one click to enlarge

Nishinoshima -activity as of 08.09.2022 - image sentinel-2 zoom / Copernicus - one click to enlarge

Nishinoshima - plume and discolored water area on 09.28.2022 / 11:50 p.m. - image Sentinel-2 L2A nat. colors - one click to enlarge
Nishinoshima - plume and discolored water area on 09.28.2022 / 11:50 p.m. - image Sentinel-2 L2A nat. colors - one click to enlarge

Nishinoshima - plume and discolored water area on 09.28.2022 / 11:50 p.m. - image Sentinel-2 L2A nat. colors - one click to enlarge

The Nishinoshima volcano in the Ogasawara Islands is the site of an ongoing eruptive phase.
Images taken by the Sentinel2 and Landsat-8.9 satellites show activity since September 23.

According to JMA and Tokyo's VAAC, an eruption at Nishinoshima produced ash plumes that reached 1.8 to 2.6 km (6,000 to 8,500 feet) above sea level and drifted toward east and west from October 1 to 4.
Multi-satellite views of the eruption show a main plume, extending 400 km, with thick haze extending further.

 

Sources: JMA, VAAC Tokyo, Sentinel-2

Nishinoshima- Sentinel-2 nat colors +SWIR image from 01.10.2022- Copernicus - one click to enlarge

Nishinoshima- Sentinel-2 nat colors +SWIR image from 01.10.2022- Copernicus - one click to enlarge

Nishinoshima - on 05.10.2022, an improved SO2 signal of 23.78 DU at a distance of 26.9 km -Estimated mass 20.3 kt - Doc. Sentinel-5P Tropomi

Nishinoshima - on 05.10.2022, an improved SO2 signal of 23.78 DU at a distance of 26.9 km -Estimated mass 20.3 kt - Doc. Sentinel-5P Tropomi

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Publié le par Bernard Duyck
Publié dans : #volcanic activity
Stromboli - new lava overflow - 04.10.2022 / 09:48 - therm webcam SCT / INGV OE

Stromboli - new lava overflow - 04.10.2022 / 09:48 - therm webcam SCT / INGV OE

Stromboli - the flow seems less fed at 7:15 p.m. on 04.10.2022 webcam therm. Sct0385/INGV OE

Stromboli - the flow seems less fed at 7:15 p.m. on 04.10.2022 webcam therm. Sct0385/INGV OE

As of 09:07 UTC on October 4, 2022, a new overflow of lava from the North crater of Stromboli was observed, which overlaps the previous one dating from October 3.

This overflow caused the lava material to roll along the Sciara del Fuoco and the front of the flow currently remains confined to the upper part of the Sciara.


In addition, a slight increase in the frequency of explosive activity and splashing is observed. From the seismic point of view, there is no significant variation in the amplitude of the volcanic tremor. The signals from the GNSS network do not show any significant variations. Tilt signals from Timpone Del Fuoco station over the past few hours show a slight change in trend.

 

Source: INGV OE

Iwo-jima - Sentinel-2 L1C image from 03.10.2022 - Copernicus, via @ar_etsch

Iwo-jima - Sentinel-2 L1C image from 03.10.2022 - Copernicus, via @ar_etsch

The status of activities on Satsuma Iwo Jima, Ogasawara Islands, from September 26 to October 3 at 3:00 p.m., regarding the Ioto volcano is published by the JMA.

At Iodake Crater, a white volcanic plume rises over 1000m above the crater rim.
At night, an incandescence was observed with a high-sensitivity surveillance camera.

No volcanic earthquake or deformation is reported... to be continued.

 

Source: JMA

Sabancaya - activity bulletin from 26.09.- to 02.10.2022 - Doc. I.G.P.

Sabancaya - activity bulletin from 26.09.- to 02.10.2022 - Doc. I.G.P.

Between September 26 and October 2, the eruptive activity of Sabancaya, Peru, remained at moderate levels, with an average of 46 daily explosions, accompanied by plumes of gas and ash reaching up to 3,000 meters above sea level. above the top.

During this period, the I.G.Peru detected 387 earthquakes of volcanic origin associated with the circulation of internal magmatic fluids, and VT earthquakes related to rock fracturing.

No significant deformation anomalies; nine thermal anomalies, VRP max. 40 Mw, are associated with the presence of a dome on the surface of the crater.

The alert level is maintained in naranja, as is the non-accessible zone of 12 km radius

 

Source: I.G.Peru

Piton de La Fournaise - Evolution of the RSAM (indicator of a surface lava emission) since 09/19/2022 00:00 UTC time (04:00 local time) on the RVA seismological station located at the level of the Rivals crater (© OVPF/IPGP ).

Piton de La Fournaise - Evolution of the RSAM (indicator of a surface lava emission) since 09/19/2022 00:00 UTC time (04:00 local time) on the RVA seismological station located at the level of the Rivals crater (© OVPF/IPGP ).

The eruption started on 09/19/2022 around 07:48 local time at Piton de La Fournaise continues. The amplitude of the eruptive tremor (indicator of an emission of lava and gas on the surface) has slightly decreased over the past 24 hours.

During the day of October 3, 64 volcano-tectonic earthquakes were recorded directly above the summit area.

Data from the permanent GNSS stations of the OVPF-IPGP show signals associated with deflation (deflation) of the building.

Piton de La Fournaise - the eruptive site on 03.10.2022 / 5:54 p.m. local - webcam Piton de Bert 4 / OVPF

Piton de La Fournaise - the eruptive site on 03.10.2022 / 5:54 p.m. local - webcam Piton de Bert 4 / OVPF

Piton de La Fournaise - the eruptive site on 04.10.2022 / 06:19 local time - webcam Piton de Bert 4 / OVPF

Piton de La Fournaise - the eruptive site on 04.10.2022 / 06:19 local time - webcam Piton de Bert 4 / OVPF

Images from the OVPF-IPGP webcam located at Piton de Bert show that :

- a lava projection activity in decrease compared to the previous days, remaining however important at the level of the eruptive vent;

- the secondary vent, located on the southern flank of the cone, which remains weakly active;

- significant degassing which persists at the level of the eruptive site;

- the majority of lava flows are always done by lava tunnels within which many resurgences are visible up to several kilometers from the eruptive cone

The Sentinel-2 satellite images (©ESA-COPERNICUS) of October 3 made it possible to locate the front of the southern casting arm at an altitude of 1800 m, or about 1.5 km northwest of the Nez coupé du Tremblet.

Piton de La Fournaise - image Sentinel-5P Tropomi SO2 from 04.10.2022 / via Mounts project

Piton de La Fournaise - image Sentinel-5P Tropomi SO2 from 04.10.2022 / via Mounts project

The lava flow estimates established by satellite method on the HOTVOLC (OPGC - Clermont Auvergne University) and MIROVA (University of Turin) platforms indicate a decreasing average flow over the last 24 hours evaluated on average at 10 m3/s (between 4 and 20 m3/s depending on the method) with a peak recorded at 27 m3/S. Over the last 2 days, the estimated lava flows are slightly decreasing in accordance with the decrease in the observed tremor. As lava flow activity is now partly tunnelled, these estimates are minimum values.

 

According to ECMWF/ERA5 meteorological data, the complex shape of the plume indicates that the maximum altitude of this plume (associated with a piece of plume heading northeast) is at an altitude of the order of, or greater than , at 4 km (600 hPa). This maximum altitude of the plume is therefore higher than that observed the previous days, in agreement with an intensification of the activity. However, this image of the plume also indicates the coexistence of lower level emissions transported west/southwest.

 

Update: The eruption started on September 19, 2022 around 07:48 local time stopped today, October 5, 2022, around 10:10 local time (6:10 UTC) following a sudden stop of the eruptive tremor.

No more lava projections are visible on the surface.

No hypothesis is ruled out as to the evolution of the situation to come (pause of the eruption, definitive cessation, resumption of activity on the same site, resumption of activity on another site), taking into account the strong seismicity that has been recorded in recent days.

 

Source: OVPF – part of the press release dated 04.10.2022 – full text at https://www.ipgp.fr/fr/ovpf/communique-04102022-15h00-heure-locale

updated 05.10.2022 / 08:30 UTC

Find all the information relating to the activity of Piton de la Fournaise on the various OVPF-IPGP media: - the website: ipgp.fr/fr/ovpf/actualites-ovpf - the Twitter account: twitter. com/obsfournaise - the Facebook account: facebook.com/ObsVolcanoPitonFournaise

Piton de La Fournaise - the eruptive site on 05.10.2022 / 01:54 UT - webcam Piton de Bert 4 / OVPF

Piton de La Fournaise - the eruptive site on 05.10.2022 / 01:54 UT - webcam Piton de Bert 4 / OVPF

Piton de La Fournaise - tremor in free fall on 05.10.2022 / 10:10 a.m. loc. - Doctor. OVPF

Piton de La Fournaise - tremor in free fall on 05.10.2022 / 10:10 a.m. loc. - Doctor. OVPF

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Publié le par Bernard Duyck
Publié dans : #volcanic activity
Stromboli - material rolling in the Sciara del Fuoco on 03.10.2022 / 10:30 a.m. - cam.SCV / INGV OE

Stromboli - material rolling in the Sciara del Fuoco on 03.10.2022 / 10:30 a.m. - cam.SCV / INGV OE

Stromboli - lava flow on 03.10.2022 / 11:00 a.m. - cam. therm. SCT / INGV OE

Stromboli - lava flow on 03.10.2022 / 11:00 a.m. - cam. therm. SCT / INGV OE

The INGV-OE reports that the monitoring networks recorded at 11:15 (09:15 UTC), the start of an overflow of lava from the northern crater of Stromboli; this overflow caused lava material to roll along the Sciara del Fuoco. The poorly fed lava front remains at the base of the NE crater.
From the seismic point of view, there is no significant variation in the amplitude of the volcanic tremor.
There are currently no significant changes in the ground deformations measured by the GNSS network.

Following an increase in flow, the lava flow, which developed along the Sciara del Fuoco, reached the coast at 12:30 p.m. (10:30 UTC).

 

After the episode of September 29, this is the second overflow in a few days at Stromboli.

 

Source: INGV OE

Ebeko - explosive episode of 07.08.2022 - photo archives L. Kotenko. IVS FEB RAS - one click to enlarge

Ebeko - explosive episode of 07.08.2022 - photo archives L. Kotenko. IVS FEB RAS - one click to enlarge

In the northeast, the KVERT communicates for this October 3

Moderate eruptive activity of the Ebeko volcano continues. According to visual data from Severo-Kurilsk volcanologists, explosions sent ash up to 3 km a.s.l., ash clouds drifted north and northeast from the volcano. Satellite data from KVERT showed that the volcano was obscured by clouds.

The Aviation Color Code is Orange.


A moderate explosive-effusive eruption of the Alaid volcano continues. According to visual data, a lava flow began flowing down the southern slope of the volcano on September 27-28. Satellite data from KVERT showed a bright thermal anomaly over the volcano.

The Aviation Color Code is Orange

 

Source: KVERT

Alaid - explosive eruption of 18.09.2022 - photo archives A.Yakimova KVERT - one click to enlarge

Alaid - explosive eruption of 18.09.2022 - photo archives A.Yakimova KVERT - one click to enlarge

At Piton de La Fournaise on October 3, the amplitude of the eruptive tremor (indicator of an emission of lava and gas on the surface) has remained stable over the past 24 hours.

Over the past 24 hours, 75 volcano-tectonic earthquakes have been recorded directly above the summit area.

The data from the permanent GNSS stations of the OVPF-IPGP no longer show signals associated with a significant deformation of the building.

Piton de La Fournaise - eruptive site and lava flows in the Enclos Fouqué - webcam Piton de Bert / OVPF - one click to enlarge
Piton de La Fournaise - eruptive site and lava flows in the Enclos Fouqué - webcam Piton de Bert / OVPF - one click to enlarge

Piton de La Fournaise - eruptive site and lava flows in the Enclos Fouqué - webcam Piton de Bert / OVPF - one click to enlarge

Piton de La Fournaise - extent of flows - image Sentinel-2 bands 12,11,8A from 03.10.2022 / 06:35 via Mounts project - one click to enlarge

Piton de La Fournaise - extent of flows - image Sentinel-2 bands 12,11,8A from 03.10.2022 / 06:35 via Mounts project - one click to enlarge

Piton de La Fournaise - thermal anomalies on 03.10.2022 / 10:20 p.m. - Very high - Doc. Mirova_MODIS_Latest10NTI

Piton de La Fournaise - thermal anomalies on 03.10.2022 / 10:20 p.m. - Very high - Doc. Mirova_MODIS_Latest10NTI

The images from the webcam located at Piton de Bert show:
- a lava projection activity which is still significant at the level of the eruptive vent;
- the secondary vent, located on the southern flank of the cone, which is weakly active
- significant degassing persists at the eruptive site.
- the majority of lava flows are always done by lava tunnels within which many resurgences are visible up to several kilometers from the eruptive cone.

The lava flow estimates established by satellite method on the HOTVOLC (OPGC - Clermont Auvergne University) and MIROVA (University of Turin) platforms indicate a stable average flow over the last 24 hours of 10 m³/s (between 4 and 20 m³/ s depending on the method) with a peak recorded at 33 m³/s. The thermal anomalies reported by Mirova remain very high.

Over the last 5 days, the estimated lava flows are increasing together with the intensification of the tremor observed from September 29.

Alert level remains at Alert 2-1 (Access to the Enclosure prohibited; eruption in the Enclosure without any particular threat to the safety of persons, property or the environment)

 

Source: OVPF - Press release dated 03.10.2022

A press point "ongoing eruption" will be proposed by the Volcanological Observatory of Piton de La Fournaise (OVPF) / Institute of Physics of the Globe (IPGP), on Tuesday October 4, 2022 at 1:30 p.m. in the auditorium of the Cité du Volcan in Bourg Murat.

Map of GPS displacements recorded during the magmatic injection that led to the eruption of September 19, 2022 at Piton de La Fournaise. The arrows represent the vertical displacements and the colored circles the vertical displacements. The color scale is given by the colored bar. The cracks opened on the 1st day are in red and the eruptive cone in formation is represented by a black circle. ©️ OVPF-IPGP

Map of GPS displacements recorded during the magmatic injection that led to the eruption of September 19, 2022 at Piton de La Fournaise. The arrows represent the vertical displacements and the colored circles the vertical displacements. The color scale is given by the colored bar. The cracks opened on the 1st day are in red and the eruptive cone in formation is represented by a black circle. ©️ OVPF-IPGP

The increase in superficial seismicity under the summit from August 28, 2022 and the inflation of the volcanic edifice which has continued almost continuously since the end of the December 2021-January 2022 eruption, witnessed the replenishment and pressurization of the superficial magmatic reservoir by upwellings of deep fluids.

This replenishment of the superficial reservoir and its pressurization led first to the September 7 intrusion which did not reach the surface, then to the September 19, 2022 eruption at 7:48 (local time, 3:48 UTC) on the flank south of the volcano inside the Enclos Fouqué caldera. The eruption is still ongoing as of this writing.

 

Source: OVPF – monthly bulletin

Find all the information relating to the activity of Piton de la Fournaise on the various OVPF-IPGP media: - the website: ipgp.fr/fr/ovpf/actualites-ovpf - the Twitter account: twitter. com/obsfournaise - the Facebook account: facebook.com/ObsVolcanoPitonFournaise

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Publié le par Bernard Duyck
Publié dans : #volcanic activity

In the past 24 hours, nine eruptions are reported at Home Reef by TGS, as well as a 5-day decline in activity with steam-dominated eruptions, with no traces of ash. The volcanic plume disperses over the ocean and causes discoloration of the waters.

On September 28, the measurements of the new island including: 268 m. X 283m. - total area 15 acres / 60,700 m² - height asl. : 15-18m.

A zone of 4 km is forbidden to navigation, and the aviation code is yellow.

 

Sources : Tonga Geological Services & USGS

Home Reef - sat. Worldview-3 of 27.09.2022 / 21:40 UTC - Doc. USGS

Home Reef - sat. Worldview-3 of 27.09.2022 / 21:40 UTC - Doc. USGS

Home Reef - evolution from June to September 2022 - Planet satellite images - via Tonga Geological services

The Sernageomin monitoring stations, installed near the Laguna del Maule Volcanic Complex, have recorded a seismic swarm since October 1 at 10:06 p.m. local time, which has 330 volcano-tectonic events (VT) associated with the fracturing of rocks at the time of the report on October 2 at 8 a.m. local time. still in progress.

The characteristics of the strongest earthquake: ML 0.2 – depth 2.9 km.

The episode being low energy, the technical alert remained green

 

At Nevados de Chillan, the Sernageomin recorded this October 2 at 4:30 p.m. an LP earthquake associated with internal fluid dynamics, dz m^zmz than an explosion, accompanied by a plume of ash and gas.

The alert remains at amarilla.

 

Source: Sernageomin

Laguna del Maule - photo Neuquen informa

Laguna del Maule - photo Neuquen informa

The eruption started at Piton de La Fournaise on 09/19/2022 around 07:48 local time continues. The amplitude of the eruptive tremor (indicator of surface lava emission) continues to increase since September 29, 9:40 p.m. local time yesterday (5:40 p.m. UTC). This intensification is most certainly linked to an increase in pressure within the eruptive cone at the origin of an increase in activity at the level of the eruptive vent observed for more than 48 hours.

Piton de La Fournaise - Evolution of the RSAM (indicator of a surface lava emission) since 09/19/2022 00:00 UTC time (04:00 local time) on the RVA seismological station located at the level of the Rivals crater (© OVPF/IPGP )

 

Images from the OVPF-IPGP webcam located at Piton de Bert show:
- still significant lava projection activity at the eruptive vent
- the secondary vent, located on the southern flank of the cone, is active again;
- degassing is still observed at the eruptive site;
- the majority of the lava flows are always done by lava tunnels within which many resurgences are visible in particular near the eruptive cone.

Piton de La Fournaise - 02.10.2022 / 02:30 UT - webcam Piton de Bert 4 / OVPF - one click to enlarge

Piton de La Fournaise - 02.10.2022 / 02:30 UT - webcam Piton de Bert 4 / OVPF - one click to enlarge

Piton de La Fournaise - 02.10.2022 / 6:17 p.m. - pano camera IRT - OVPF - one click to enlarge

Piton de La Fournaise - 02.10.2022 / 6:17 p.m. - pano camera IRT - OVPF - one click to enlarge

Piton de La Fournaise - SO2 mass 3.30 kt on 02.10.2022 - image Sentinel-5P Tropomi - Doc. DLR / BIRA / ESA

Piton de La Fournaise - SO2 mass 3.30 kt on 02.10.2022 - image Sentinel-5P Tropomi - Doc. DLR / BIRA / ESA

The lava flow estimates established by satellite method on the HOTVOLC (OPGC - Clermont Auvergne University) and MIROVA (University of Turin) platforms indicate an average flow over the last 24 hours of 5 to 15 m3/s. Estimated lava flows have been increasing since the tremor intensification observed on September 29. As lava flow activity now takes place primarily in tunnels, these estimates are minimum values.

The acquisitions of the COPERNICUS program developed by the European Commission provide images of the TROPOMI instrument intended for the observation of the composition of the atmosphere, and in particular the concentrations of SO2. The image of October 1 (09:44 UTC) indicates a notable increase in degassing, with a plume more concentrated in SO2 than the previous days, and visible up to a distance of about 400 km.

Below is the evolution of the integrated mass within a radius of 300 km for the last few days (7 km altitude): The direction of plume transport is still compatible with an altitude of about 3 km. At this altitude and in the hours preceding the acquisition, the wind speed was about 7 m/s (approx. 25 km/h). Thus, the plume visible over a distance of 300 km, with a mass of 1.5 kton, corresponds to an integrated emission over approximately 12 hours, which leads to an estimate of the average flux of SO2 of approximately 3.0 kton/day over these last 12 hours. The true altitude of the plume, less than 7 km, implies that this value is an underestimate (perhaps by a factor of 2 to 5). (©ESA-Copernicus (TROPOMI); GVO (volcanoes); AERIS/ICARE-LOA (VolcPlume portal); INERIE-LCSQA-ATMO France / GEOD'AIR; IPGP).

24 volcano-tectonic earthquakes were recorded directly above the summit area during the day of October 1.

The data from the permanent GNSS stations of the OVPF-IPGP no longer show signals associated with a significant deformation of the building.

Alert level: Alert 2-1 (Access to the Enclosure prohibited; eruption in the Enclosure without any particular threat to the safety of persons, property or the environment).

 

Source: OVPF

Find all the information relating to the activity of Piton de la Fournaise on the various OVPF-IPGP media: - the website: ipgp.fr/fr/ovpf/actualites-ovpf - the Twitter account: twitter. com/obsfournaise - the Facebook account: facebook.com/ObsVolcanoPitonFournaise

Sorikmarapi - 29.09.2022 / 08:13 - PVMBG Magma Indonesia

Sorikmarapi - 29.09.2022 / 08:13 - PVMBG Magma Indonesia

The activity of the Sorikmarapi volcano on Sumatra has continued at fluctuating values ​​since January 2022.
The PVMBG Volcano Observatory has detected about 146 volcano-tectonic earthquakes since September 29, but without any high visual activity. This may suggest increasing pressure from the hydrothermal system and/or magma within the volcano edifice. On October 2, the PVMBG reports six deep volcanic earthquakes, with an amplitude of 2-43 mm, S-P 0.7-2.5 seconds and an earthquake duration of 4-25 seconds.


However, the alert status remains at level 1.
In order to avoid the potential danger of volcanic gases or sudden phreatic explosion, people and tourists are not allowed to approach the nearby main crater.


Source: Volcano Activity Update/PVMBG October 3, 2022

Sorikmarapi - risk zone map - Doc. PVMBG

Sorikmarapi - risk zone map - Doc. PVMBG

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Publié le par Bernard Duyck
Publié dans : #volcanic activity
Piton de La Fournaise - the eruptive site on 01.10 at 5:44 local time - OVPF-IPGP-IRT camera located at Piton de Bert (©OVPF-IPGP-IRT) - one click to enlarge

Piton de La Fournaise - the eruptive site on 01.10 at 5:44 local time - OVPF-IPGP-IRT camera located at Piton de Bert (©OVPF-IPGP-IRT) - one click to enlarge

Piton de La Fournaise - the eruptive site on 01.10 at 10:54 am local - Cam. OVPF- IPGP - IRT- one click to enlarge

Piton de La Fournaise - the eruptive site on 01.10 at 10:54 am local - Cam. OVPF- IPGP - IRT- one click to enlarge

The eruption of Piton de La Fournaise, which began on 09/19/2022 around 07:48 local time, continues. The amplitude of the eruptive tremor (indicator of surface lava emission) has been increasing since 9:40 p.m. local time on September 29, 2022 (5:40 p.m. UTC). This intensification is most certainly linked to an increase in pressure within the eruptive cone which led to the widening of the opening of the main mouth yesterday. The activity at the level of the secondary mouth (south of the main cone) mentioned in yesterday's press release has greatly decreased.

Piton de La Fournaise - Evolution of the RSAM (indicator of a surface lava emission) since 09/19/2022 00:00 UTC time (04:00 local time) on the RVA seismological station located at the level of the Rivals crater (© OVPF/IPGP )

Piton de La Fournaise - Evolution of the RSAM (indicator of a surface lava emission) since 09/19/2022 00:00 UTC time (04:00 local time) on the RVA seismological station located at the level of the Rivals crater (© OVPF/IPGP )

Three volcano-tectonic earthquakes have been recorded directly above the summit area over the past 24 hours.

The resumption of slight inflation (swelling) over the entire volcano (summit and enclosure) is confirmed but remains of very low intensity for the moment (< 1 cm).

 

Images from the OVPF-IPGP webcam located at Piton de Bert show that the greater lava projection activity observed yesterday at the eruptive site is continuing. On the other hand, the secondary eruptive mouth mentioned in the previous press release, gradually ceased its activity during the day yesterday.

Degassing is still observed at the eruptive site.

Piton de La Fournaise - degassing on 02.10.2022 / 10:10 a.m. - pano webcam IRT-OVPF - one click to enlarge

Piton de La Fournaise - degassing on 02.10.2022 / 10:10 a.m. - pano webcam IRT-OVPF - one click to enlarge

The majority of lava flows are still through lava tunnels within which many resurgences are visible;

Lava flows also occur directly from the secondary mouth.

 

The lava flow estimates established by satellite method on the HOTVOLC (OPGC - Clermont Auvergne University) and MIROVA (University of Turin) platforms indicate an average flow over the last 24 hours relatively stable around 4-6 m3/s with a peak recorded at 16 m3/s today late morning. These measurements show since September 28, a gradual increase in the estimated flow. As lava flow activity now takes place primarily in tunnels, these estimates are minimum values.

It should be noted that significant peaks in SO2 air pollution were reached at the Bourg-Murat station, with hourly values ​​that exceeded 330 ug/m3.

Piton de La Fournaise - image Sentinel-5P Tropomi / SO2_PBL at 01.10.2022 / via Mounts project

Piton de La Fournaise - image Sentinel-5P Tropomi / SO2_PBL at 01.10.2022 / via Mounts project

Alert level: Alert 2-1 (Access to the Enclosure prohibited; eruption in the Enclosure without any particular threat to the safety of persons, property or the environment)

 

Source: OVPF

Find all the information relating to the activity of Piton de la Fournaise on the various OVPF-IPGP media: - the website: ipgp.fr/fr/ovpf/actualites-ovpf - the Twitter account: twitter. com/obsfournaise - the Facebook account: facebook.com/ObsVolcanoPitonFournaise

Semeru - webcam snapshot monitor PVMBG 02.11.2022 / 00:11

Semeru - webcam snapshot monitor PVMBG 02.11.2022 / 00:11

The eruption of Semeru continues.

A white plume was observed at the main crater on October 1, with moderate to high intensity about 200 meters from the summit.

The seismicity of 01,10,2022 is characterized by:

- 65 eruption earthquakes with an amplitude of 10-22 mm and an earthquake duration of 55-130 seconds.
- 7 emission / blast earthquakes, with an amplitude of 1 to 8 mm and the duration of the earthquake was 35 to 85 seconds.
- An episode of harmonic tremor, with an amplitude of 6 mm, and an earthquake duration of 100 seconds.
- 1 deep volcanic earthquake, with an amplitude of 24 mm, S-P 1.5 seconds and an earthquake duration of 15 seconds.
- A local tectonic earthquake, with an amplitude of 18 mm, S-P 9 seconds and an earthquake duration of 40 seconds.
- And 3 distant tectonic earthquakes.

The activity level is at III (Siaga), with the recommendation not to
carry out no activity in the southeastern sector along Besuk Kobokan, up to 13 km from the summit (the center of the eruption). Outside of this distance, the community does not conduct activities within 500 meters of the bank (river edge) along Besuk Kobokan due to the potential for expansion from hot clouds and lava flows. at a distance of 17 km from the summit.
and not to move within 5 km of the crater / summit of Mount Semeru because it is subject to the danger of stone throwing (incandescent).

 

Source: Magma Indonesia, PVMBG

Sakurajima - webcam and doc. DMY 02.10.2022

Sakurajima - webcam and doc. DMY 02.10.2022

At Sakurajima, the activity continues, with in 1st report this October 2, 2022 at 1:34 p.m. local time, a white eruptive plume at 1,300 m. above the Minamidake crater.

The displacement of the plume is towards the west.

 

Source: JMA

Fuji San - 30.09.2022 - The local Kofu Meteorological Observatory in Yamanashi Prefecture announced the first snow on Mount Fuji. - Doctor. WeatherNews - one click to enlarge

Fuji San - 30.09.2022 - The local Kofu Meteorological Observatory in Yamanashi Prefecture announced the first snow on Mount Fuji. - Doctor. WeatherNews - one click to enlarge

As a bonus, the first snows on Mount Fuji... at your discretion.

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Piton de La Fournaise - the OVPF teams in the field give the scale - photo 30.09.2022 OVPF

Piton de La Fournaise - the OVPF teams in the field give the scale - photo 30.09.2022 OVPF

The eruption started at Piton de La Fournaise on 09/19/2022 around 07:48 local time continues.

The amplitude of the eruptive tremor (indicator of surface lava emission) has been increasing since 9:40 p.m. local time yesterday (5:40 p.m. UTC). This intensification is very certainly linked to an increase in pressure within the eruptive cone which first led to the widening of the opening of the main mouth of the cone then to an increase in activity of the secondary mouth (to the south of the main cone) around 23:15 local time.

Piton de La Fournaise - Evolution of the RSAM (indicator of a surface lava emission) since 09/19/2022 00:00 UTC time (04:00 local time) on the RVA seismological station located at the Rivals crater (© OVPF/IPGP ).

Piton de La Fournaise - Evolution of the RSAM (indicator of a surface lava emission) since 09/19/2022 00:00 UTC time (04:00 local time) on the RVA seismological station located at the Rivals crater (© OVPF/IPGP ).

The images from the OVPF-IPGP webcam located at Piton de Bert show since 11:15 p.m. local time yesterday evening a lava projection activity greater than the previous days at the level of the eruptive site, with an enlargement of the main eruptive mouth and secondary.

Degassing is still observed at the eruptive site

the majority of lava flows are still through lava tunnels within which many resurgences are visible; lava flows also occur directly from the secondary mouth.

The lava flow estimates established by satellite method on the HOTVOLC (OPGC - Clermont Auvergne University) and MIROVA (University of Turin) platforms indicate an average flow over the last 24 hours relatively stable and low around 2-4 m³/s. As lava flow activity now takes place primarily in tunnels, these estimates are minimum values.

A main flow of fluid lava formed and was advancing eastward at about 150 meters per hour yesterday.

Piton de La Fournaise - the eruptive site on 09.30.2022 / 05:45 UT - webcam Piton de Bert 4 / OVPF - one click to enlarge

Piton de La Fournaise - the eruptive site on 09.30.2022 / 05:45 UT - webcam Piton de Bert 4 / OVPF - one click to enlarge

Piton de La Fournaise - For comparison: shooting of the eruptive site on September 28, 2022 around 3 p.m. (local time). The main mouth was more closed and the secondary mouth (on the left in the photo) was already visible but of small size (©OVPF-IPGP).

Piton de La Fournaise - For comparison: shooting of the eruptive site on September 28, 2022 around 3 p.m. (local time). The main mouth was more closed and the secondary mouth (on the left in the photo) was already visible but of small size (©OVPF-IPGP).

The processing by stereophotogrammetry of the images acquired by the OVPF-IPGP teams on September 28, 2022 made it possible to estimate the size of the eruptive cone. It was at this date, at its highest point, about 27 m high and 87 m wide.

A volcano-tectonic earthquake was recorded directly above the summit area over the past 24 hours.

The resumption of slight inflation (swelling) over the entire volcano (summit and enclosure) is confirmed but remains of very low intensity for the moment (< 1 cm).

Alert level: Alert 2-1 (Access to the Enclosure prohibited; eruption in the Enclosure without any particular threat to the safety of persons, property or the environment)

 

Source: OVPF-IPGP

Find all the information relating to the activity of Piton de la Fournaise on the various OVPF-IPGP media: - the website: ipgp.fr/fr/ovpf/actualites-ovpf - the Twitter account: twitter. com/obsfournaise - the Facebook account: facebook.com/ObsVolcanoPitonFournaise

Piton de La Fournaise - 3D reconstruction by stereophotogrammetry of the eruptive cone from images (drone) acquired on September 28, 2022 (©OVPF-IPGP).

Piton de La Fournaise - 3D reconstruction by stereophotogrammetry of the eruptive cone from images (drone) acquired on September 28, 2022 (©OVPF-IPGP).

In Suwanosejima, there were 7 explosions on September 29 and 5 on September 30 until 3:00 p.m. In addition, large volcanic blocks are sometimes observed reaching about 500m from the center of the crater.
The volcanic plume accompanying the eruption rose up to 1,500m above the crater rim and a glowing glow was observed at night.
According to the Fukuoka District/Toshima Village Meteorological Observatory, about 5 km south-southwest of Mitake Crater, rumbling and falling tephra have been confirmed.
At 0036 and 17:51 on September 29, a large volcanic earthquake occurred and an earthquake intensity of 1 was observed with the epicenter on the west side of Suwanosejima.

Minor fluctuations were observed suggesting an increase in magma accumulation.
Volcanic earthquakes on the western side of the island, including large ones, continue to occur.
Vigorous eruptive activity will continue in the future, and a large volcanic eruption will occur within a radius of about 2 km from the center of Mitake Crater, according to the JMA report.

 

Source: JMA – information on the situation of the volcano on September 30, 2022 / 4 p.m. / Fukuoka District Meteorological Observatory/Kagoshima Local Meteorological Observatory.

Suwanosejima - explosion of 09.30.2022 / 17:17-18 - JMA webcam

Suwanosejima - explosion of 09.30.2022 / 17:17-18 - JMA webcam

A minor, passive ash emission from an active vent behind crater lake at Whakaari/White Island observed on Sunday September 18 has not been seen since.

The North Rim web camera continues to produce views of the crater area and regular checks by our National Geohazard Monitoring Center have shown no ash emissions. Observations from the TropOMI satellite which images sulfur dioxide (SO2) once a day have shown no signal from Whakaari/White Island since Sunday 18 September.
In recent days, images from the North Rim camera have become less clear. This is a normal result of the island vapor plume drifting over the camera and depositing a thin, salty film on the camera's protective cover. Images remain bright enough to provide useful views of the active crater area. The thin, salty film will often disappear with the next heavy rain.

Whakaari - activity downing - alert remains at 2 - GeoNet webcam comparative views 18.09.2022 & 28.09.2022 - one click to enlarge

Whakaari - activity downing - alert remains at 2 - GeoNet webcam comparative views 18.09.2022 & 28.09.2022 - one click to enlarge

GeoNet has previously suggested that the minor, passive emission of ash and sulfur dioxide on Sunday September 18 was most likely due to a small, shallow batch of magma releasing its gas and carrying small magma fragments with it. The absence of other ash or sulfur dioxide emissions since confirms this conclusion. There is no evidence of increased activity at Whakaari/White Island.

The VAL remains at Level 2 (Moderate to Intense Disorder), acknowledging the current level of activity, but also continuing to recognize the greatest level of uncertainty in our interpretation due to the current lack of consistent and useful real-time data. The Aviation Color Code is lowered to yellow, reflecting a reduced likelihood of minor ash emissions.

 

Source: GeoNet

Reykjanes ridge - earthquake of 01.10.2022 / 01:18 UTC and regional seismicity - Doc. EMSC automatic location (2)

Reykjanes ridge - earthquake of 01.10.2022 / 01:18 UTC and regional seismicity - Doc. EMSC automatic location (2)

The seismic swarm, which started in the southern part of the Reykjanes Ridge about 4 days ago, continues, with about 80 events recorded between magnitude 4.5 to 5.9.

 

 

Citizen
Response

 

 

 

 

Date & Time 

UTC

Latitude

degrees

Longitude

degrees

Depth

km

Mag

[+]

Region name

[+]

 

 

 

 

 

2022-10-01   04:58:04.21hr 52min ago

53.81 

N  

35.30 

W  

10

4.8

 REYKJANES RIDGE

 

 

 

 

2022-10-01   02:06:09.54hr 44min ago

53.91 

N  

35.28 

W  

10

5.0

 REYKJANES RIDGE

 

 

 

 

2022-10-01   01:18:53.95hr 31min ago

53.75 

N  

35.51 

W  

10

5.9

 REYKJANES RIDGE

 

 

 

 

2022-09-30   19:52:05.510hr 58min ago

53.92 

N  

35.33 

W  

10

4.8

 REYKJANES RIDGE

 

 

 

 

2022-09-30   12:50:09.9

54.07 

N  

35.29 

W  

10

4.8

 REYKJANES RIDGE

 

 

 

 

2022-09-30   12:21:07.3

53.62 

N  

35.18 

W  

10

4.6

 REYKJANES RIDGE

 

 

 

 

2022-09-30   11:38:53.2

53.54 

N  

35.34 

W  

10

4.6

 REYKJANES RIDGE

 

Bold : Earthquakes with a magnitude ≥ 4.5 in Euro-med, or ≥ 5.5 in the world
Red : Earthquakes with a magnitude ≥ 5 in Euro-med, or ≥ 6 in the world

Sources: USGS earthquake hazards program and EMSC

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Suwanosejima - Ontake crater - phoyo Yukio Hayakawa 1998 / Gunma univ. / via GVP-06460 - one click to enlarge

Suwanosejima - Ontake crater - phoyo Yukio Hayakawa 1998 / Gunma univ. / via GVP-06460 - one click to enlarge

Suwanosejima - Volcanic ash advisory on 29.09.2022 - VAAC Tokyo

Suwanosejima - Volcanic ash advisory on 29.09.2022 - VAAC Tokyo

Authorities raised the warning for Suwanosejima Volcano to Level 3 from September 28, 22:50 JST due to increased activity.

The Suwanosejima volcano has been erupting since September 24, with volcanic activity increasing from September 26. Authorities recorded 25 eruptions from September 24-28. The Japan Meteorological Agency (JMA) warned of new pyroclastic activity up to 2 km (1.2 miles) from the Otake and Mitake craters, as well as volcanic ash on the leeward side of the volcano. As of September 29, no damage had been reported at the village of Toshima, Kagoshima Prefecture, located about 4 km (2.5 miles) from the craters.


Authorities have created a 2 km (1.2 mile) exclusion zone around the crater. Access to the volcano is also restricted. New eruptions could cause localized transport disruptions; flight delays could occur at Suwanosejima Airport (RJX8) if an eruption creates a large ash plume. Ground transportation disruptions could also occur. Ash fall could cause slippery driving conditions on nearby roads and reduced visibility, resulting in localized traffic disruptions.

 

Source: JMA

Suwanosejima - simplified map - Doc.photovolcanica

Suwanosejima - simplified map - Doc.photovolcanica

Stromboli - explosion and fallout in the Sciara del Fuoco - 29.09.2022 / 1:25 p.m. - LGS webcam - click to enlarge

Stromboli - explosion and fallout in the Sciara del Fuoco - 29.09.2022 / 1:25 p.m. - LGS webcam - click to enlarge

Stromboli - exhibition of 29.09.2022 / 1:25 p.m. by the therm.webcam SCT / INGV OE - one click to enlarge

Stromboli - exhibition of 29.09.2022 / 1:25 p.m. by the therm.webcam SCT / INGV OE - one click to enlarge

LGS recorded an explosive event above the norm in Stromboli this September 29 at 13:24 UTC / 15:24 local, associated with a seismic signal in the VLP band with a maximum amplitude of 2.7x10-5 m (moving) and at a ground deformation of about 0.25 microradians (recorded on the OHO inclinometer). The explosion generated an infrasonic pressure of 150 Pa, located in the NE sector of the crater.
From the surveillance cameras (LBZ), the material emitted poured into the Sciara del Fuoco.

Stromboli - 29.09.2022 - Comparison between seismic amplitudes (UD) and inclination - Ground deformations indicate that today's event (star) enters the field of major explosions - Doc.LGS - one click to enlarge

Stromboli - 29.09.2022 - Comparison between seismic amplitudes (UD) and inclination - Ground deformations indicate that today's event (star) enters the field of major explosions - Doc.LGS - one click to enlarge

This event is compatible with a Major type explosive event.
The explosion was preceded by an increase in the CO2/SO2 ratio in the plume which, although of lesser magnitude and duration than those recorded on the occasion of previous major explosions post-2020, alerted the experimental prototype of an automatic alert system.
Ground deformations indicate that today's event (star) is entering the field of major explosions
The major explosion did not exceed the parameters of the climax early warning system.

 

Sources: Laboratorio Geofisica Sperimentale / LGS & INGV OE

The Trident Group, seen from Baked Mountain - photo Game McGimsey - USGS / via AVO - click to enlarge

The Trident Group, seen from Baked Mountain - photo Game McGimsey - USGS / via AVO - click to enlarge

The earthquake swarm that began on August 24, 2022 under the Trident volcano continues. In addition, episodes of weak seismic tremor and low frequency earthquakes have been detected since August 28. Together, these observations mean that Trident is showing signs of elevated unrest above the known background level. Therefore, we are raising the Aviation Color Code to Yellow and the Volcano Alert Level to Advisory.

During the current swarm, earthquake depths were initially mostly deep at about 25 km below sea level, but gradually became shallower to about 5 km on August 28. Since then, earthquakes have mostly occurred 3-6 km below sea level, although some deeper events have been detected. Earthquake magnitudes (M) ranged from M –0.7 to M 1.9. At the height of the swarm, dozens of earthquakes occurred daily beneath the volcano, but earthquake rates have since declined to a few per day. No other signs of agitation were detected in the monitoring data.

The increase in seismic activity is probably caused by the movement of magma or magmatic fluids. Increases in seismic activity have already been detected at Trident and other similar volcanoes, with no subsequent eruptions. We expect additional shallow seismicity and other signs of unrest, such as gassing, elevated surface temperatures, and surface deformation, to precede any future eruption, should it occur.

Source: AVO

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Nishinoshima - slight activity this 28.09.2022 - image Sentinel-2 L2A Optimized natural colors - Doc. Copernicus - one click to enlarge

Nishinoshima - slight activity this 28.09.2022 - image Sentinel-2 L2A Optimized natural colors - Doc. Copernicus - one click to enlarge

Nishinoshima - extended plume and discolored water zone this 09.28.2022 / 11:50 p.m. - image Sentinel-2 L2A Optimized natural colors - Doc. Copernicus - one click to enlarge

Nishinoshima - extended plume and discolored water zone this 09.28.2022 / 11:50 p.m. - image Sentinel-2 L2A Optimized natural colors - Doc. Copernicus - one click to enlarge

A small activity is visible at Nishinoshima in the Ogasawara Islands, noticeable in Sentinel-2 L2A imagery, with a white plume spreading tens of kilometers to the west and gassy discolored waters.

Mirova detected weak thermal anomalies on September 28, 2022, of VRP 1 and 2 MW.

 

Sources: Sentinel-2 and Mirova

Ebeko - photo archive 08.2022 / L.Kotenko - KVERT

Ebeko - photo archive 08.2022 / L.Kotenko - KVERT

A moderate eruptive activity continues at Ebeko, in the Kuriles, on September 28. According to visual data from Severo-Kurilsk volcanologists, explosions sent ash up to 1.9 km a.s.l., ash cloud drifts east from volcano; an ash fall is observed in Severo-Kurilsk.

Ash explosions up to 6 km above sea level could occur at any time. Ongoing activity could affect low-flying aircraft and Severo-Kurilsk airport. The aviation color code remains Orange.

 

Source: KVERT & Interfax

Piton de La Fournaise - Eruptive site and two lava flow arms - image Sentinel bands 12,11,8 - IR dated 28.09.2022- via Mounts Project - one click to enlarge

Piton de La Fournaise - Eruptive site and two lava flow arms - image Sentinel bands 12,11,8 - IR dated 28.09.2022- via Mounts Project - one click to enlarge

At Piton de La Fournaise, the amplitude of the eruptive tremor (indicator of surface lava emission) has remained generally stable over the past 24 hours. It is however, slightly increasing on September 28, 2022, compared to the previous days, to around 25% of its initial amplitude.

The resumption of a slight inflation (swelling) of the entire volcano (summit and enclosure) is confirmed.

No volcano-tectonic earthquake has been recorded directly above the summit area over the past 24 hours.

Piton de La Fournaise - Evolution of the RSAM (indicator of a surface lava emission) since 09/19/2022 00:00 UTC time (04:00 local time) on the RVA seismological station located at the level of the Rivals crater - slightly increasing this 28.09.2022 (© OVPF/IPGP).

Piton de La Fournaise - Evolution of the RSAM (indicator of a surface lava emission) since 09/19/2022 00:00 UTC time (04:00 local time) on the RVA seismological station located at the level of the Rivals crater - slightly increasing this 28.09.2022 (© OVPF/IPGP).

Lava flow estimates established by satellite method on the HOTVOLC (OPGC - Clermont Auvergne University) and MIROVA (University of Turin) platforms indicate an average flow over the last 24 hours that is relatively stable and low around 3.5 m³/s with a peak maximum rated at 7 m³/s. The analyzes of sentinel-1 and ALOS satellite images carried out by the ISDeform platform show that:
- The positions of the fronts of the various flow arms have not changed since September 20, 23:56 local time (19:56 UTC),
- The contour of the lava flows did not change significantly between September 20 and 23,
- On the other hand, between September 23 and 27, the two main arms (east and south-east) widened. (image Sentinel-1, below)

The observations of the OVPF-IPGP teams in the field show for today an activity similar to the previous days

 

Alert level: Alert 2-1 (Access to the Enclosure prohibited; eruption in the Enclosure without any particular threat to the safety of persons, property or the environment)

 

Source: OVPF

Find all the information relating to the activity of Piton de la Fournaise on the various OVPF-IPGP media: - the website: ipgp.fr/fr/ovpf/actualites-ovpf - the Twitter account: twitter. com/obsfournaise - the Facebook account: facebook.com/ObsVolcanoPitonFournaise

Piton de La Fournaise - Contours of the flows on 09.27.2022, with 2 main arms - Sentinel-1 satellite image (passage of September 15 and 27, 2022) - Doc. ©ESA-Copernicus, ©ISDeform; OSUG-EOST-OSUL-IPGP-OPGC

Piton de La Fournaise - Contours of the flows on 09.27.2022, with 2 main arms - Sentinel-1 satellite image (passage of September 15 and 27, 2022) - Doc. ©ESA-Copernicus, ©ISDeform; OSUG-EOST-OSUL-IPGP-OPGC

Piton de La Foi-urnaise - 28.09.2022 / 2:30 p.m. local time - formation of corded lavas. - photo ©OVPF-IPGP - one click to enlarge

Piton de La Foi-urnaise - 28.09.2022 / 2:30 p.m. local time - formation of corded lavas. - photo ©OVPF-IPGP - one click to enlarge

Hawaii Volcano Observatory staff replaced the Mauna Loa Sulfur Cone gas measuring station in the Southwest Rift Zone. The gas monitoring site is at an altitude of 3,430 meters (11,240 feet) above sea level.
The MultiGas station is one of many the HVO has deployed on the island of Hawai'i. The stations measure volcanic gases (sulphur dioxide, hydrogen sulphide, carbon dioxide and water vapour), fumarole temperature and meteorological parameters. The data is tele-measured at HVO, where scientists can view it remotely. The monitoring of the ratio of the various gases emitted provides information on the agitated behavior of this volcano.
When it was named in 1921, Sulfur Cone was notable for the abundance of sulfur crystals that covered it and the surrounding area, the result of extensive outgassing from a fissure downstream of Mauna Loa's summit. But a later visit noted that molten sulfur had flowed down the side of the cinder and spatter cone and remnants of this yellow flow can be seen on the side of the cone.

Current volcanic alert level: Advisory
Current Aviation Color Code: Yellow

 

Source : HVO

Mauna Loa - Replacement of the Sulfur cone gas measurement station - photo HVO- USGS - one click to enlarge

Mauna Loa - Replacement of the Sulfur cone gas measurement station - photo HVO- USGS - one click to enlarge

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Sangay - ash emission on 27.09.2022 / 06:53 loc. - cam ECU911 / IGEPN - one click to enlarge

Sangay - ash emission on 27.09.2022 / 06:53 loc. - cam ECU911 / IGEPN - one click to enlarge

Sangay - 27.09.2022 / 6:20 UTC - GOES-16 ABI / NOAA image

Sangay - 27.09.2022 / 6:20 UTC - GOES-16 ABI / NOAA image

From 01:00 TL, September 27, 2022, thanks to satellite images (GOES-16), an ash cloud is observed which reaches about 2 km above the crater of the Sangay volcano, Ecuador, and headed towards the southwest.

Therefore, there is a possibility of ash fall in the province of Chimborazo. This phenomenon has persisted during the current eruptive period which began in May 2019.

The IG-EPN continues to monitor the event and will report in a timely manner if changes in seismic signals are detected.

 

In the past 24 hours, the Washington VAAC has issued 3 reports of ash emissions in a west and northwest direction with a maximum height of 2,400 meters above crater level.
Frequent small columns of ash were observed during the day.
The FIRMS system records 34 thermal alerts and MIROVA records 2 high thermal alerts (239 and 196 MW) in the last 24 hours.
This morning, thanks to the images shared by ECU-911, the volcano was clear, an emission of ash could be observed 800 meters above the summit in a southwesterly direction. At the moment, the volcano is cloudy.
Seismicity is significant, with 825 explosion earthquakes (EXP), 12 Long Period earthquakes (LP), and 22 emission earthquakes (TREMI)
The alert remains at the Amarilla level.

 

Source: IGEPN

Home Reef - volcanic events of 09.27.2022 (red dots), and ash eruption (gray dot) - Doc. VOLCAT via TGS

Home Reef - volcanic events of 09.27.2022 (red dots), and ash eruption (gray dot) - Doc. VOLCAT via TGS

In the Pacific, the geological service of the Tonga Islands reports for September 27, 2022 a total of 21 volcanic events at Home Reef, including an ash eruption at 12:36 p.m., imaged by the Himawari-8 satellite.

No new measurements from the new island since September 19: 211 m. x 218m. Surface: 8.6 acres / 34800 m², estimated height: 15 m. asl.

Notice for the navy: do not enter waters within a radius of 4 km. around Home Reef

 

Source: Tonga Geological Services

Piton de La Fournaise - shooting of the eruptive site on September 27, 2022 at 1:55 p.m. local time. On the left the cone in formation since the beginning of the eruption on September 19, on the right the peak Kalla Pélé (eruption August-October 2015) (©OVPF-IPGP) - one click to enlarge

Piton de La Fournaise - shooting of the eruptive site on September 27, 2022 at 1:55 p.m. local time. On the left the cone in formation since the beginning of the eruption on September 19, on the right the peak Kalla Pélé (eruption August-October 2015) (©OVPF-IPGP) - one click to enlarge

The amplitude of the eruptive tremor (indicator of surface lava emission) at Piton de La Fournaise has remained generally stable over the past 24 hours, at around 20% of its initial amplitude.

No volcano-tectonic earthquake has been recorded directly above the summit area over the past 24 hours.

Piton de La Fournaise - The amplitude of the eruptive tremor (indicator of surface lava emission) to station  has remained generally stable over the past 24 hours / as of 27.09.2022 (©OVPF-IPGP)

Piton de La Fournaise - The amplitude of the eruptive tremor (indicator of surface lava emission) to station has remained generally stable over the past 24 hours / as of 27.09.2022 (©OVPF-IPGP)

A slight inflation (swelling) of the summit zone of the volcano seems to be emerging, this parameter will be confirmed in the coming days.

The lava flow estimates established by satellite method on the HOTVOLC (OPGC - Clermont Auvergne University) and MIROVA (University of Turin) platforms indicate an average flow over the last 24 hours that is relatively stable and low around 2 m3/s, with a maximum peak rated at 7 m3/s.

The observations of the OVPF-IPGP teams in the field show for today an activity similar to the previous days.

Alert level: Alert 2-1 (Access to the Enclosure prohibited; eruption in the Enclosure without any particular threat to the safety of persons, property or the environment)

 

Source: OVPF-IPGP

Find all the information relating to the activity of Piton de la Fournaise on the various OVPF-IPGP media: - the website: ipgp.fr/fr/ovpf/actualites-ovpf - the Twitter account: twitter. com/obsfournaise - the Facebook account: facebook.com/ObsVolcanoPitonFournaise

Vulcano - INGV photo archives

Vulcano - INGV photo archives

At Vulcano, in the Aeolian Islands, temperatures remain stable at high values ​​along the upper edge of the crater.
The CO2 flux in the crater area remains stable at medium-high values.
The SO2 flux in the crater area is stable at a moderately medium-high level
Geochemistry of fumarolic gases: The concentration of magmatic species (CO2, He, N2) is slightly decreasing (11 mol% CO2 on 09/14/2022).
The CO2 flux at the base of the La Fossa cone and in the Vulcano Porto area: stable CO2 flux values ​​above the background noise in the Rimessa site; stable but still abnormal values ​​on the Camping Sicilia site; slightly decreasing values ​​at the Palizzi site (P4max); in the Faraglione site the values ​​recorded are stable and close to the baseline values
Monthly CO2 Flux Campaign: C emissions in the Vulcano Porto area show no significant change from the previous month and still remain at levels above background.

Vulcano - spatial distribution of CO2 flux from the ground on 20.09.2022 - Doc. INGV OE

Vulcano - spatial distribution of CO2 flux from the ground on 20.09.2022 - Doc. INGV OE

The INGV reports a stabilization of the supply of fluids of fumarolic origin to the thermal aquifer is generally observed, but still remains at abnormal levels in certain sites.

The other parameters do not show significant variations.

 

Source: INGV OE – full text https://buff.ly/3LPH6Zo

Reykjanes Ridge - seismic swarm and its location: A seismic swarm takes place south of the Reykjanes Ridge, in the Atlantic at the Charlie-Gibbs transform fault, and reveals a possible magmatic intrusion. Source: USGS Earthquake Hazards, via @EQuake_Analysis - one click to enlargeReykjanes Ridge - seismic swarm and its location: A seismic swarm takes place south of the Reykjanes Ridge, in the Atlantic at the Charlie-Gibbs transform fault, and reveals a possible magmatic intrusion. Source: USGS Earthquake Hazards, via @EQuake_Analysis - one click to enlarge

Reykjanes Ridge - seismic swarm and its location: A seismic swarm takes place south of the Reykjanes Ridge, in the Atlantic at the Charlie-Gibbs transform fault, and reveals a possible magmatic intrusion. Source: USGS Earthquake Hazards, via @EQuake_Analysis - one click to enlarge

A seismic swarm takes place south of the Reykjanes Ridge, in the Atlantic at the level of the Charlie-Gibbs transform fault, and reveals a possible magmatic intrusion.

 

Source: USGS Earthquake Hazards

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Publié le par Bernard Duyck
Publié dans : #volcanic activity
Piton de La Fournaise - A closed cone, leaning against Piton Kalla Pélé, has formed around the remaining active vent - photos ©OVPF-IPGP-IRT 26.09.2022 - one click to enlarge
Piton de La Fournaise - A closed cone, leaning against Piton Kalla Pélé, has formed around the remaining active vent - photos ©OVPF-IPGP-IRT 26.09.2022 - one click to enlarge

Piton de La Fournaise - A closed cone, leaning against Piton Kalla Pélé, has formed around the remaining active vent - photos ©OVPF-IPGP-IRT 26.09.2022 - one click to enlarge

The eruption started at Piton de La Fournaise on 09/19/2022 around 07:48 local time continues. The amplitude of the eruptive tremor (indicator of surface lava emission) has remained generally stable over the past 24 hours, at around 20% of its initial amplitude

No volcano-tectonic earthquake has been recorded directly above the summit area over the past 24 hours. Over the last 72 hours, no significant deformation has been recorded.

Piton de La Fournaise - the active cone, its plume, and the lava flow arms - photo ©OVPF-IPGP-IRT 26.09.2022 - one click to enlarge

Piton de La Fournaise - the active cone, its plume, and the lava flow arms - photo ©OVPF-IPGP-IRT 26.09.2022 - one click to enlarge

Piton de La Fournaise - The most active flow spreads out towards the Château-fort crater with numerous resurgences on its 1° km - photo ©OVPF-IPGP-IRT 26.09.2022 - one click to enlarge

Piton de La Fournaise - The most active flow spreads out towards the Château-fort crater with numerous resurgences on its 1° km - photo ©OVPF-IPGP-IRT 26.09.2022 - one click to enlarge

The lava flow estimates established by satellite method on the HOTVOLC (OPGC - Clermont Auvergne University) and MIROVA (University of Turin) platforms indicate an average flow over the last 24 hours that is relatively stable and low, with a peak estimated at 8 m³/ s.

The images from the OVPF-IPGP webcam located at Piton de Bert showed this morning 09/26/2022:
- still significant degassing at the eruptive site and low-amplitude lava projections;
- a gas plume still directed towards the south-west quarter as also observed on satellite data in recent days;
- a lava flow activity still mainly through lava tunnels as observed yesterday by infrared imagery according to 2 main flow arms, oriented respectively east-south-east and south-east;
- several resurgences of lava visible at the level of the tunnels.

An overview performed this afternoon confirmed the following points:
- A closed cone has formed around the remaining active vent;
- The plume is pushed by the wind towards the southwest;
- The flow is divided into 2 arms spreading respectively towards the east-south-east and the south-east;
- The most active flow extends east-south-east towards the castle crater;
- The end of this flow located around 1850 m altitude and about 1 km south-east of the castle is no longer active;
- Visible active flows (resurgences) remain confined to the first km of flows from the vent.

 
Alert 2-1 (eruption in the Enclosure without any particular threat to the safety of people, property or the environment) remains in effect.

 

Source: OVPF-IPGP press release 26.09.2022 / 5 p.m. local

Find all the information relating to the activity of Piton de la Fournaise on the various OVPF-IPGP media: - the website: ipgp.fr/fr/ovpf/actualites-ovpf - the Twitter account: twitter. com/obsfournaise - the Facebook account: facebook.com/ObsVolcanoPitonFournaise

Piton de LaFournaise - thermal anomalies on 09.26.2022 / 10:15 p.m. - Doc. Mirova MODIS_logVRP

Piton de LaFournaise - thermal anomalies on 09.26.2022 / 10:15 p.m. - Doc. Mirova MODIS_logVRP

A moderate eruptive activity continues at Alaid Volcano in the northern Kuriles. An ash plume rose to 2,500-3,000 meters asl. and spread about 140 km east-southeast of the volcano.

The moderate eruptive activity of the volcano continues. Ash explosions up to 6 km (19,700 ft) above sea level could occur at any time. Current activity could affect low-flying aircraft. Aviation color code remains Orange.

Mirova reports moderate to high thermal anomalies on September 26 and 27, between VRP 123 and 801 MW

 

Sources: KVERT, Mirova and VAAC Tokyo

Alaid - explosive eruption of 09.18.2022 - photo A.Yakimova / KVERT

Alaid - explosive eruption of 09.18.2022 - photo A.Yakimova / KVERT

Alaid - thermal anomalies at 09.27.2022 / 0600Z - Doc. Mirova - - Alaid - volcanic ash advisory on 27.09.2022 - Doc. VAAC Tokyo - one click to enlargeAlaid - thermal anomalies at 09.27.2022 / 0600Z - Doc. Mirova - - Alaid - volcanic ash advisory on 27.09.2022 - Doc. VAAC Tokyo - one click to enlarge

Alaid - thermal anomalies at 09.27.2022 / 0600Z - Doc. Mirova - - Alaid - volcanic ash advisory on 27.09.2022 - Doc. VAAC Tokyo - one click to enlarge

The Geophysical Institute of Peru reports that the eruptive activity of the Sabancaya volcano remains at moderate levels this week, that is to say with the recording of an average of 50 daily explosions, with columns of ash and gases up to 1.8 km altitude above the summit of the volcano and their consequent dispersion.

The IGP recorded and analyzed the occurrence of 323 earthquakes of volcanic origin, associated with the circulation of internal magmatic fluids and Volcano-Tectonic (VT) type earthquakes associated with rock fracturing.

Monitoring the deformation of the volcanic structure using GNSS techniques (processed with fast orbits) does not show any significant anomalies. However, in general, an inflation process was observed in the northern sector (surroundings of the Hualca Hualca volcano).

Satellite recordings have identified the presence of 10 thermal anomalies, with a maximum value of 18 MW, associated with the presence of a lava body on the surface of the crater of the volcano.

The volcanic alert level remains orange, with an inaccessible zone of 12 km radius.
 

Source : I.G.Peru

Sabancaya - activity report between 19 and 25.09.2022 - Doc. I.G.Peru

Sabancaya - activity report between 19 and 25.09.2022 - Doc. I.G.Peru

A small seismic swarm has been detected below the summit of Mauna Loa volcano. As of 2 a.m. HST on 2022-09-23, the U.S. Geological Survey's Hawaiian Volcano Observatory has recorded more than 38 earthquakes beneath the summit caldera region, the most earthquakes in a group about 3.1 mi (5 km) wide and -1.2 to 0.6 mi (-2 to 1 km) below the surface.

Mauna Loa - seismic swarm as of 09.23.2022 - Source Hawaii Tracker


These earthquakes may result from changes in the magma storage system and/or may be part of normal readjustments of the volcano due to changing stresses within it. The HVO continues to monitor Hawaiian volcanoes for any changes.


According to HVO Scientist in Charge Ken Hon, "Seismic activity beneath Mauna Loa has been gradually increasing over the past two months. Small earthquake swarms are considered a normal part of this increase in activity. Currently, there is no indication that magma is moving towards the surface and other monitoring systems are showing normal behavior.Seismicity and deformation levels remain below those recorded during the winter of 2021. HVO will continue to monitor closely monitor this activity and report any significant changes."
 

 

Source : HVO

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