Overblog
Suivre ce blog Administration + Créer mon blog

Earth of fire

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

sismologia

Publié le par Bernard Duyck
Publié dans : #volcanic activity, #Sismologia

The Fuego Volcano Observatory reports 3 to 5 explosions per hour, with weak, moderate and strong characteristics, which raise columns of gray ash to heights of 4,500 to 4,800 meters above sea level, which propagate north and northwest for a distance of up to 30 kilometers or more, with the probability of generating a weak ashfall on La Soledad, San Antonio Nejapa, Acatenango and Patzicía. The explosions produce weak avalanches and moderate towards the ravines of Santa Teresa, Ceniza and Las Lajas until they reach the edge of the vegetation, as well as low rumblings with shock waves that vibrate the roofs and windows of the houses of the nearby communities of the volcano.

Fuego - incandescence in the crater and plume of gas and cebdres towards the northwest - Landsat 9 bands 7,6,2 image of 24.03.2022 - Doc. Insivumeh USGS - one click to enlarge

Fuego - incandescence in the crater and plume of gas and cebdres towards the northwest - Landsat 9 bands 7,6,2 image of 24.03.2022 - Doc. Insivumeh USGS - one click to enlarge

During the night and early in the morning, incandescent pulses reaching up to 200 meters high were observed above the crater. Due to the direction of the wind in the Observatory, no sounds associated with volcanic activity were heard. Bulletin BEFGO 015-2022 remains in force

Ashes can be carried by the wind and remain suspended at low levels in the air, creating a hazy environment for several hours which can be harmful to human health. In the presence of rain, lahars can be generated in all the ravines of the volcano. It is not excluded that new lava flows will be generated towards more ravines, as well as the continuation of violent explosions loaded with ash and avalanches of moderate characteristics. towards one of the canyons of the Fuego volcano, so you should not stay near or inside the canyons of the volcano.

INSIVUMEH maintains visual and instrumental monitoring of volcanic activity through seismic stations, volcano spotters and web cameras.

 

Source: Insivumeh

Anak Krakatau - 2022.03.25 / 09:57 WIB - Sertung / PVMBG webcam - Magma Indonesia - one click to enlarge

Anak Krakatau - 2022.03.25 / 09:57 WIB - Sertung / PVMBG webcam - Magma Indonesia - one click to enlarge

Anak Krakatau - 25.03.2022 / 2:39 p.m. WIB - Sertung / PVMBG webcam - Magma Indonesia - one click to enlarge

Anak Krakatau - 25.03.2022 / 2:39 p.m. WIB - Sertung / PVMBG webcam - Magma Indonesia - one click to enlarge

Continuation of the eruptive episodes reported yesterday morning at Anak Krakatau: two episodes occurred this Friday, March 25, 2022, respectively at 09:55 WIB, accompanied by a gray to black ash plume reaching ± 1,500 m above the summit ( ± 1657 m above sea level). This eruption was recorded on a seismograph with a maximum amplitude of 57 mm and a duration of 104 seconds.

And at 2:37 p.m. WIB with a gray ash plume observed at ± 2,000 m above the summit (± 2,157 m above sea level). This eruption was recorded on a seismograph with a maximum amplitude of 60 mm and a duration of 114 seconds.

The activity level remains at 2 / siaga, with a no-go zone of 2 km radius.

 

Sources: PVMBG & Magma Indonesia

São Jorge - seismic swarm in and around the island - doc. IPMA 24.03.2022

São Jorge - seismic swarm in and around the island - doc. IPMA 24.03.2022

São Jorge - seismic swarm at 03.25.2022 09:22 - screenshot Doc. CIVISA

São Jorge - seismic swarm at 03.25.2022 09:22 - screenshot Doc. CIVISA

The Portuguese Institute of the Sea and the Atmosphere announces that the seismic crisis they are experiencing on the island of São Jorge in the Azores archipelago, could be linked to a rise in magma through a dike.

More than 2,000 seismic movements have already been detected in the Azores, in particular on the island of São Jorge, where the Portuguese Meteorological Institute, in charge of seismic and volcanic monitoring, has raised alert levels to level 4 out of 5 , that is, a real risk of a possible eruption due to the presence of clear pre-eruption signs, with a lot of seismicity, deformation and gas, for which the evacuation of patients from the island and the preparation of new evacuations if the activity continues to increase.

In view of the seismic energy released accumulated in the Azores, after a very powerful release at the beginning, the energy continues to be released at a constant rate, which indicates an ongoing process, which neither relaxes nor accelerates , but continues, indicating a clear eruptive process in progress.

 

Sources: IPMA, CIVISA and Volcanes y ciencia Hoy

Azores Sao Jorge Volcano Update; Magma is on the Move, Alert Level Raised The Sao Jorge volcano in the Azores Island chain is showing signs of unrest, as its alert level was just raised from 2 to 4.

La Palma / Cumbre Vieja - long duration earthquakes on 24.03.2022 - InVolcan

La Palma / Cumbre Vieja - long duration earthquakes on 24.03.2022 - InVolcan

Since 7:01 p.m. on March 24, 2022, the Canarian seismic network, operated by INVOLCAN, has been recording a swarm of long-term seismic events on the Cumbre Vieja volcano. So far, more than 60 small events located at depths of around 10-13 km have been recorded.

These long-period seismic events do not reflect a process of magmatic intrusion, but a release of hydrothermal fluids caused by the cooling of the magma chamber.

 

Source: InVolcan

Lire la suite

Publié le par Bernard Duyck
Publié dans : #volcanic activity, #Sismologia

Two eruptive episodes marked the morning of Anak Krakatau on March 24, 2022.

The first at 09:12 WIB was accompanied by a white-colored plume, observed about 500 meters above the summit, dispersing to the southeast. It was recorded on the seismogram with a max. of 40mm.

The second occurred at 11:10 a.m. WIB; the plume, white to gray, rose about 1,000 meters above the summit / 1,157 m. asl. The recording on the seismogram shows a max. 45mm.

Anak Krakatau - eruption of 03.24.2022 / 09:12 WIB - Sertung PVMBG webcam - one click to enlarge

Anak Krakatau - eruption of 03.24.2022 / 09:12 WIB - Sertung PVMBG webcam - one click to enlarge

Anak Krakatau - eruption of 03.24.2022 / 11:11 WIB - plume at 1000 m. Sertung PVMBG webcam - one click to enlarge

Anak Krakatau - eruption of 03.24.2022 / 11:11 WIB - plume at 1000 m. Sertung PVMBG webcam - one click to enlarge

The seismicity of March 23 was characterized by:

2 emission earthquakes, blast, with an amplitude of 20-30 mm, and the duration of the earthquake was 20-35 seconds.
1 episode of harmonic earthquake, with an amplitude of 22 mm and an earthquake of 45 seconds.
8 low frequency earthquakes, with an amplitude of 8 to 15 mm and an earthquake duration of 9 to 12 seconds.
1 episode of continuous tremor, amplitude 1 to 30 mm, mostly 7 mm.

The activity level remains at 2 / waspada, with an approach ban within a radius of 2 km. from the crater

 

Sources : PVMBG & Magma Indonesia

Semeru - seismicity and recommendations / 15 to 22.03.2022 - Doc. PVMBG  - one click to enlarge

Semeru - seismicity and recommendations / 15 to 22.03.2022 - Doc. PVMBG - one click to enlarge

At Semeru, on the island of Java, the seismicity from March 15 to 22, 2022 is characterized by:

- 429 earthquakes of eruptions
- 4 earthquakes of pyroclastic avalanche flows
- 7 avalanche earthquakes
- 14 harmonic episodes
- shallow volcanic earthquakes
- 1 local tectonic earthquake and 24 distant tectonic earthquakes

Semeru - eruption of 23.03.2022 - vidéo CCTV / BPBD

That of March 23, 2022 describes:

- 68 eruption earthquakes
- 1 earthquake of pyroclastic flows of avalanches with an amplitude of 25 mm and an earthquake duration of 420 seconds.
- 1 avalanche earthquake
- 6 emission earthquakes
- 6 harmonic episodes
- 2 deep volcanic earthquakes
- 3 distant tectonic earthquakes

 

The Semeru remains in activity level 3 / siaga, with a recommendation not to travel within a radius of 5 km., an area prone to pyroclast fallout, and to carry out no activity in the south-eastern sector along Besuk Kobokan, up to 13 km from the summit (the center of the eruption). Beyond 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 of hot clouds and lava flows. lava up to a distance of 17 km from the summit.

 

Sources: PVMBG & Magma Indonesia

Poás - fumaroles on the banks of the Caliente laguna on 03.23.2022 / 10:47 a.m. - Ovsicori webcam

Poás - fumaroles on the banks of the Caliente laguna on 03.23.2022 / 10:47 a.m. - Ovsicori webcam

After a recent visit by the organization Volcanoes sin Fronteras, experts found hot springs in the active Poás crater.

"Laguna Caliente is fed by several streams, quite warm, temperatures reaching 90°C and new fumaroles have also appeared," explained volcanologist Gino González.

The acidic Poás Lake has risen three meters in the past year and its temperature has risen from 46 to 36°C. This increase in volume is linked to the formation of various fumaroles, especially in the eastern part of the crater.

According to scientists, the last time such a phenomenon was recorded was in the late 1990s.

Experts consider it essential to study and monitor these hot springs because their eventual decrease or disappearance would mean an increase in volcanic activity. Samples will be analyzed by the INGV.

 

Sources : Teletica & Volcanoes sin Fronteras

São Jorge - alert 4 - possibility of eruption - earthquakes at 23.03.2022 / Meteo Trás-os-Montes - Portugal via CIVISA

São Jorge - alert 4 - possibility of eruption - earthquakes at 23.03.2022 / Meteo Trás-os-Montes - Portugal via CIVISA

The seismic swarm that marks São Jorge in the Azores continues.

The Azores SeismoVolcanic Information and Monitoring Center (CIVISA) today raised the volcanic alert level on the island of São Jorge to 4 (out of a total of five), which means a real possibility of an eruption. .

As this is an island that has only been colonized since the 15th century, the only eruptions for which we have written sources are those of 1580 and 1808, the two most recent eruptions on São Jorge.

 

Sources: CIVISA & CVARG

São Jorge - the 3 volcanic complexes - Doc. cvarg.azores.gov.pt - one click to enlarge

São Jorge - the 3 volcanic complexes - Doc. cvarg.azores.gov.pt - one click to enlarge

Historical eruptions on São Jorge - 1580 and 1808 - Doc. Il Mondo dei Terremoti

Historical eruptions on São Jorge - 1580 and 1808 - Doc. Il Mondo dei Terremoti

Lire la suite

Publié le par Bernard Duyck
Publié dans : #volcanic activity, #Sismologia
Aerial view of active vents at Whakaari/White Island as of 03.23.2022, showing areas of collapse (red dotted line). The bright colors are hydrothermal minerals precipitated to the ground. - GeoNet photo - one click to enlarge

Aerial view of active vents at Whakaari/White Island as of 03.23.2022, showing areas of collapse (red dotted line). The bright colors are hydrothermal minerals precipitated to the ground. - GeoNet photo - one click to enlarge

Recent observation and gas measurement flights to the Whakaari/White Island volcano confirm that dilute ash emission has currently ceased. A subsidence has occurred in the 2019 primary crater. The Volcanic Alert Level remains at Level 2.

During the gas measurement flight, a geyser was observed from a small gray colored pool on the south side of the 2019 primary crater. A little over an hour later, during a flight of observation, the pool had disappeared and a collapse pit was present. The observation flight also established that a larger collapse structure was present in the crater, but it is not known exactly when this occurred. The formation of collapse craters at Whakaari/White Island was common in the past and was thought to be caused either by the withdrawal of liquid below the crater or by the removal of fine-grained ash during recent emissions of ashes. Although this collapse activity poses no immediate danger, it shows that the shallow crater environment remains dynamic and changes in response to pressure variations beneath the active craters. This is a sign of continuing troubles.
Gas emissions have decreased since the last measurements and vent temperatures are also below about 290 C. The lake water level has dropped slightly in recent weeks. The volcanic tremor remains weak.

The current activity level corresponds to moderate to high levels of agitation. Thus, the Volcanic Alert Level remains at 2 and the Aviation Color Code remains at Yellow.

 

Source: GeoNet 23.03.2022

Etna - winter conditions on the 1st day of spring - photo Boris Behncke 22.03.2022

Etna - winter conditions on the 1st day of spring - photo Boris Behncke 22.03.2022

Overall, the state of activity of the summit craters of Etna showed, during the week of March 14 to 20, 2022, no variation compared to that observed the previous week. In particular, the degassing activity of the summit craters was mainly carried by the crater of the well located in the northwest sector of Bocca Nuova, characterized by an intense sometimes impulsive degassing.
The Voragine craters and the NE craters, on the other hand, showed a predominant degassing linked to fumaroles present along the edges of the crater.
Seismic fracturing activity is characterized by an event of M = 3.3. Tremor amplitude: medium to medium level.
Infrasound activity is moderate.
Ground deformation monitoring networks have not
experienced significant changes over the past week.

Stromboli - activity in the northern area of ​​the craters - INGV OE webcam at 20.03.2022 / 2:15 p.m.

Stromboli - activity in the northern area of ​​the craters - INGV OE webcam at 20.03.2022 / 2:15 p.m.

Normal activity was observed in Stromboli for the period from March 14 to 20, explosive of the Strombolian type with projection activity in the North zone.

The total hourly frequency of explosions fluctuated between medium (11 events / h) and medium-high (18 events / h) values. The intensity of the explosions was mainly medium to low in the North Crater area and low in the Center-South Crater area.

Vulcano - photo archives © Bernard Duyck - one click to enlarge

Vulcano - photo archives © Bernard Duyck - one click to enlarge

The temperatures recorded on the edge of the crater of La Fossa in Vulcano show stable values.
The CO2 flux in the crater area remains at high values. The CO2 flux at the base of the La Fossa cone and in the Vulcano Porto area: CO2 fluxes recorded in the Rimessa, C. Sicilia and P4max sites, show a slight downward trend, but remain at average values -raised; in the Faraglione site, there are values ​​close to the base.
The SO2 flux in the crater area : SO2 flux at a medium-high level.

Geochemistry of fumarolic gases: No update is available.
Geochemistry of thermal aquifers: the physico-chemical parameters recorded in the Camping Sicilia well show modest drops in temperature and salinity, while one can be observed in the Bambara well with stabilization of the piezometric level and a slight decrease in salinity .


Local seismicity: low rate of occurrence of local events.
Regional seismicity: No earthquake with Ml >= 1.0 was located in the area of ​​the island of Vulcano.
The network of permanent GNSS stations has not registered any significant changes.

 

Source: the various INGV OE reports on activity between March 14 and 20, 2022 (posted on March 22, 2022)

São Jorge - seismic swarm on 03.22.2022 - Doc. SAPO - one click to enlarge

São Jorge - seismic swarm on 03.22.2022 - Doc. SAPO - one click to enlarge

Since Saturday afternoon, +1800 earthquakes have been recorded on the western half of São Jorge, in the Azorian archipelago, ... at least 94 have been felt by the population.

 

"The fact that the seismic crisis is located in the fissural volcanic system das Manadas leads to call it a seismovolcanic crisis, and all scenarios must be considered, including a larger magnitude earthquake or a possible eruption", reads -we. in the note published by the SAPO, recalling that the municipalities of Velas and Calheta activated their municipal civil protection emergency plans on Monday.

Azores - São Jorge: focus on the outstanding seismic swarm - GeologyHub video - http://YouTube.com/c/GeologyHub

The last passage of Sentinel on March 21, 2022 at 7:49 p.m. made it possible to establish an interferogram revealing a real deformation of the ground. This deformation cannot simply be explained by seismic activity and may have an origin of magmatic uplift. If you live in or near any of these places, be prepared to evacuate on short notice. (Civil protection)

 

Whether the origin of the earthquakes is tectonic (we are at a triple plate junction point), or volcanic (with a rich past and an uncertain future), its evolution will be interesting to follow.

 

The Azores microplate is at the triple junction point between the American, Indo-European and African plates

 

Source: SAPO – SRPCBA / Serviço Regional de Proteção Civil e Bombeiros dos Açores - GeologyHub

Lire la suite

Publié le par Bernard Duyck
Publié dans : #volcanic activity, #Sismologia
Lonquimay volcano - Amarilla alert on 03.21.2022 - Sernageomin

Lonquimay volcano - Amarilla alert on 03.21.2022 - Sernageomin

Sernageomin, Onemi Chile and regional authorities held a technical meeting this morning where the change to Alerta Tecnica Amarilla was decreed for the Lonquimay volcano in the La Araucanía region.

During the month of March, the recording of an unusual hybrid-type (HB) volcanic seismicity was recorded at Lonquimay, accompanied by long-period (LP) seismicity, the two signals generally associated with fluid dynamics in vents. volcanic. To a lesser extent, volcano-tectonic (VT) seismicity has been observed, linked to the rupture of rock material in volcanic systems.

 

Although their sizes and magnitudes are low to date, their assessment is distinguished by an incisive appearance during the first half of March, especially from March 9. Due to their low magnitude, only some of the HB and VT earthquakes were located near the main volcanic edifice, with distances between 2 and 7 km, and depths varying between 4 and 11 km from the summit of the volcano.

Analysis of data associated with surface deformation, and surface manifestations, sulfur dioxide levels, thermal and geomorphological anomalies, show that they remain stable.

 

The appearance of anomalous and low-magnitude seismicity, associated with superficial manifestations, justifies the precautionary change of the technical alert in Amarilla / “changes in the behavior of volcanic activity”.

 

Source: Sernageomin REAV 21.03.2022 / 4:00 p.m. local

Galapagos / Isabela, Wolf volcano - Sentinel-2 bands 12,11,8A image from 03.17.2022 / 4:33 p.m. - Doc. Mounts project - one click to enlarge

Galapagos / Isabela, Wolf volcano - Sentinel-2 bands 12,11,8A image from 03.17.2022 / 4:33 p.m. - Doc. Mounts project - one click to enlarge

In the Galapagos, Wolf Volcano's surface and internal activity levels remain high, with a decreasing trend.
Between March 20 and 21 / 11 a.m., the IGEPN recorded 3 volcano-tectonic earthquakes
The MOUNTS system recorded 12.6 tons of SO2 on 03/20/2022 at 2:15 p.m. TL.
FIRMS registers 63 thermal alerts and MIROVA registers 1 high thermal alert (1276 MW) and 1 moderate alerts at Wolf (between 210 and 491 MW) during the last 24 hours.
The thermal anomalies of the GOES-16 satellite are maintained due to the advance of the flows of lava.

 

 

Sources; IGEPN, Mirova, Mounts project

Wolf - Thermal anomalies on 22.03.2022 / 04:25 - Doc. Mirova_MODIS_Latest10NTI

Wolf - Thermal anomalies on 22.03.2022 / 04:25 - Doc. Mirova_MODIS_Latest10NTI

São Jorge in the Azores archipelago - photo Tripadvisor - one click to enlarge

São Jorge in the Azores archipelago - photo Tripadvisor - one click to enlarge

The seismic swarm continues in the Azores under the island of São Jorge, according to the Azores Seismo-Volcanic Information and Monitoring Center.

Have been recorded during:

- last 24 hours: 128 earthquakes, including 123 of M2+ and 2 of M3+

- of the previous 7 days: 352 earthquakes, including 331 of M 2+ and 18 of M3+

- the previous month: 359 earthquakes, including 338 of M2+ and 18 of M3+

Awaiting news from the teams delegated on site to refine the geophysical data.

Sources: OVGA, Center for Information and Seismo-Volcanic Monitoring of the Azores and Volcanoes y ciencia Hoy

São Jorge - an island of volcanic origin - photo walkhikeportugalw / Tripadvisor - one click to enlarge

São Jorge - an island of volcanic origin - photo walkhikeportugalw / Tripadvisor - one click to enlarge

Lire la suite

Publié le par Bernard Duyck
Publié dans : #volcanic activity, #Sismologia
Ruapehu summit with Te Wai ā-moe lake - photo archibes 04.2019 / GNS / Brad Scott

Ruapehu summit with Te Wai ā-moe lake - photo archibes 04.2019 / GNS / Brad Scott

A new heating phase has started at Mt. Ruapehu (New Zealand) and the temperature of Crater Lake (Te Wai ā-moe) has now reached 31°C. This temperature rise was accompanied by high levels of volcanic tremor.

The Volcanic Alert Level at Mount Ruapehu is raised to Level 2 in response to these changes. The aviation code remains green.

There is an increased likelihood of eruptive activity as a strong tremor indicates increased gas flow through the system. Despite an increase in gas flow, lake temperature responds only slowly, suggesting that a partial blockage may exist in the vent below the lake. This could allow pressure to build up in the volcano.

The modeled heat flux in the lake is currently estimated at around 330 MW (megawatt), up from 100 MW in February 2022.
The lake currently overflows into the Whangaehu River, but the level of outflow is believed to be minor. The color of the lake is expected to change to a darker gray color as the sediments at the bottom of the lake are disturbed by the influx of warm fluids warming the lake.

 

Source: GeoNet

Semeru - Pyroclastic flow of 2022.03.20 / 07:04 WIB - PVMBG webcam, Magma Indonesia

Semeru - Pyroclastic flow of 2022.03.20 / 07:04 WIB - PVMBG webcam, Magma Indonesia

At Mt. Semeru, eruptive activity continues.

The seismicity of March 20 is marked by:
- 64 eruption earthquakes, with an amplitude of 10-25 mm and an earthquake duration of 50-180 seconds.
- 1 earthquake related to a pyroclastic avalanche flow, at 07:01 WIB with an ash plume observed at ± 500 m above the summit, and with an amplitude of 20 mm and an earthquake duration of 180 seconds.
- 1 avalanche earthquake, with an amplitude of 15 mm and an earthquake duration of 70 seconds.
- 1 harmonic episode with an amplitude of 10 mm, and an earthquake duration of 200 seconds.
- 1 distant tectonic earthquake with an amplitude of 28 mm, S-P 20 seconds and an earthquake duration of 90 seconds.
- 1 earthquake with Flood Vibration with an amplitude of 30 mm and an earthquake duration of 4200 seconds.

The activity level remains at 3 / siaga.

 

Sources : PVMBG, Magma Indonesia

São Jorge - increase in seismicity on 03.19.2022 - Doc. IVAR - one click to enlarge

São Jorge - increase in seismicity on 03.19.2022 - Doc. IVAR - one click to enlarge

A seismic swarm has started in São Jorge, in the Azores archipelago. More than 100 earthquakes were recorded by the seismic monitoring network, the strongest being M3.5 on the Richter scale; several tremors were felt by the population.

Difficult at this stage to define its origin: magmatic or tectonic. Teams are delegated on site to refine the geophysical data.

 

Small reminder of the last volcanic activity on São Jorge in 1808. The volcanic activity is related to the central rift system, and fissural eruptions... which is reminiscent of the eruption on La Palma in 2021.

 

Sources: IVAR, Google maps, Slip rates of Azorean active faults from neotectonic and paleoseismicity studies: data from the central group of islands - José Madeira - António Brum da Silveira

Azores - seismic swarm - More than 100 earthquakes in 16 hours on March 19 and 20, 2022, in the seismic swarm of São Jorge Island

Azores - seismic swarm - More than 100 earthquakes in 16 hours on March 19 and 20, 2022, in the seismic swarm of São Jorge Island

Main tectonic structures of S. Jorge. Main faults: P - Picos F.; PC – Pico do Carvão F.; USJ - Urze-S. João F.; RS – Ribeira Seca. The inset shows details of the morphologies and structures related to the eastern tip of the Pico do Carvão fault, including scarps, en echelon faults, displaced cinder cones, and collapsed ponds. Slip rates of Azorean active faults from neotectonic and paleoseismicity studies: data from the central group of islands - José Madeira - António Brum da Silveira / via Research Gate - one click to enlarge

Main tectonic structures of S. Jorge. Main faults: P - Picos F.; PC – Pico do Carvão F.; USJ - Urze-S. João F.; RS – Ribeira Seca. The inset shows details of the morphologies and structures related to the eastern tip of the Pico do Carvão fault, including scarps, en echelon faults, displaced cinder cones, and collapsed ponds. Slip rates of Azorean active faults from neotectonic and paleoseismicity studies: data from the central group of islands - José Madeira - António Brum da Silveira / via Research Gate - one click to enlarge

São Jorge - alignment of volcanic cones on the route of the central rift - Google maps image - one click to enlarge

São Jorge - alignment of volcanic cones on the route of the central rift - Google maps image - one click to enlarge

Lire la suite

Publié le par Bernard Duyck
Publié dans : #volcanic activity, #Sismologia
Whakaari / White island - GeoNet webcam 14.02.2022 / 15:10 NZDT

Whakaari / White island - GeoNet webcam 14.02.2022 / 15:10 NZDT

Last week, GNS technicians began work to improve the transmission of seismic data and webcam images from Whakaari / White island. Images can now be received more often and downloaded more quickly, and data from the single operating seismometer is nearly continuous.

Minor amounts of ash emission continue to be observed on the webcam. Other intermittent ash emissions may continue to occur. The lake water level has risen in response to recent wet weather and mud geysers have been observed in one of the main craters. The geyser has been quite common over the years when the lake level is high and water floods some of the vents.

A gas measurement flight was also conducted three weeks ago, recording an increase in one of the volcanic gas emissions measured at the volcano in mid-January 2022. The sulfur dioxide gas emission rate (SO2) was similar to that of the last survey but The carbon dioxide (CO2) emission rate was slightly higher.

The current activity level corresponds to moderate to high levels of agitation. As such, the Volcanic Alert Level remains at 2 and the Aviation Color Code remains at Yellow.
The Volcanic Alert Level reflects the current level of volcanic unrest or activity and is not a prediction of future activity. While Volcanic Alert Level 2 is primarily associated with the risk of volcanic unrest (including the discharge of hot volcanic steam and gases, earthquakes, landslides and hydrothermal activity), there is also a rash risk and rashes can still occur with little or no warning.

 

Source: GeoNet 15.02.2022 / 4:20 p.m.

Sabancaya - activity report between February 7 and 13, 2022 - Doc. I.G.Peru

Sabancaya - activity report between February 7 and 13, 2022 - Doc. I.G.Peru

From February 7 to 13, 2022, the IGPeru informed us that the activity of Sabancaya remained at moderate levels, with an average of 15 explosions per day, and plumes of ash and gas reaching a height of 1,700 meters above the summit.

During this period, 122 volcanic earthquakes associated with the circulation of internal magmatic fluids were detected. Volcano-tectonic earthquakes, related to rock fracturing, occurred mainly to the west of the volcano, with max. of 2.7.

The structural deformation does not show any significant anomalies.

Mirova identified 8 thermal anomalies, with a max. of VRP 26 MW, associated with the presence of a lava body on the surface of the crater.

The volcanic alert remains at naranja, associated with an inaccessible zone of 12 km radius around the crater.

 

On February 14, a strong SO2 signal was detected at a distance of 3.3 km from Sabancaya, with 39.84 DU of SO2 at an altitude of about 2 km. The estimated mass at less than 300 km is 10.3 ktons. ( Sentinel-5P Tropomi)

 

Sources: I.G.Peru and Tropomi

Sabancaya - 2022.02.14 - strong SO2 signal at a distance of 3.3 km from Sabancaya with 39.84 DU of SO2 at an altitude of about 2 km. - Doc. Sentinel-5P Tropomi / DLR / BIRA / ESA

Sabancaya - 2022.02.14 - strong SO2 signal at a distance of 3.3 km from Sabancaya with 39.84 DU of SO2 at an altitude of about 2 km. - Doc. Sentinel-5P Tropomi / DLR / BIRA / ESA

In Ethiopia, the southern pit crater of Erta Ale still shows thermal anomalies visible on Sentinel-2 images.

The Mirova site noted thermal anomalies between February 12 and 14, between VRP between 1 and 10 MW.

 

Sources: Sentinel-Hub and Mirova

Erta ale - Image Sentinel-2 bands 12,11,4 from 13.02.2022

Erta ale - Image Sentinel-2 bands 12,11,4 from 13.02.2022

ErtaAle - thermal anomalies as of 02.14.2022 / 10:40 p.m. - doc Mirova_MODIS_Latest10NTI

ErtaAle - thermal anomalies as of 02.14.2022 / 10:40 p.m. - doc Mirova_MODIS_Latest10NTI

In Iceland, on February 14 at 5:27 p.m., an M3.0 earthquake was detected 2.5 km north of Grindavík, in the Reykjanes Peninsula; it was felt by the townspeople. A few aftershocks have been detected.

Today February 15 at 00:23 a M2.9 earthquake was detected about 13 km SSW of Flatey, felt at Akureyri. Several aftershocks have been detected. The island is located in Breiðafjörður, northwest Iceland, between Snæfellsnes to the south and Vestfirðir to the north.

 

Source: IMO

Reykjanes Peninsula - seismicity on 02.15.2022 / 07:45 - Doc. IMO
Reykjanes Peninsula - seismicity on 02.15.2022 / 07:45 - Doc. IMO
Reykjanes Peninsula - seismicity on 02.15.2022 / 07:45 - Doc. IMO

Reykjanes Peninsula - seismicity on 02.15.2022 / 07:45 - Doc. IMO

Lire la suite

Publié le par Bernard Duyck
Publié dans : #volcanic activity, #Sismologia
Kilauea / Halema'uma'u crater - return of lava as of 18.01.2022- USGS image by K. Mulliken. - one click to enlarge

Kilauea / Halema'uma'u crater - return of lava as of 18.01.2022- USGS image by K. Mulliken. - one click to enlarge

At Kilauea, lava returned to the western vent of Halema'uma'u Crater around 10:45 a.m. HST on January 18, 2022. The extent of the active lava lake and the overall effusion rate began to decrease yesterday after - noon on 20.01. The active lava lake was confined to a small pond north of the western vent cone overnight. Just after 4:00 a.m. HST this morning the lava effusion rate increased and at 7:00 a.m. HST this morning 21.01 the active extent of the lava lake resumed its previous extent.

The lava lake has experienced a total elevation of approximately 83 meters since the lava emerged on September 29, 2021. Measurements on January 14, 2022 indicated that the total volume of lava spilled since the start of the eruption was d 'about 45 million cubic meters. at this moment.
The volcanic tremor associated with the eruption - as recorded by nearby seismometers - waned until about 8 p.m. yesterday. HST, then started to rise from around 5:30am this morning. The most recent sulfur dioxide (SO2) emission rate of approximately 2100 tonnes per day was measured on January 19, 2022.


Current volcanic alert level: Watch
Current Aviation Color Code: Orange

 

Source: HVO

Turrialba - 2022.01.22 at 9:34 a.m. - The surroundings of the active crater are grayed out with ash from the January 17 eruption. - Ovsicori webcam - one click to enlarge

Turrialba - 2022.01.22 at 9:34 a.m. - The surroundings of the active crater are grayed out with ash from the January 17 eruption. - Ovsicori webcam - one click to enlarge

In Turrialba, Costa Rica, no eruption is reported on the surface as of January 21
Seismic activity is similar, compared to yesterday.
At the time of this report, the winds are blowing to the northwest.
Degassing is observed in the active crater.

Frequent high and low frequency earthquakes are detected. In recent days, geodetic observations show no significant change. Gas ratios and SO2 concentration are within the range of the past few days.

The surroundings of the active crater are grayed out with ash from the January 17 eruption.

The alert level is at 3.

 

Source: Ovsicori

 Fuego - photo archive W.Chigna via Conred / 2020.12

Fuego - photo archive W.Chigna via Conred / 2020.12

Due to the change in wind direction at a height of 4500 meters above sea level. The rumblings of the shock waves are heard in several towns on the eastern flank of the Fuego volcano, they have also been reported on the southern and southwestern flank of the capital.

The OVFGO reports weak, moderate and some strong explosions, in the range of 8 to 12 per hour, expelling columns of ash at an approximate height of 4,500 and 4,800 meters above sea level. (14 763 to 15,748 feet) extending west southeast, a distance of 15 kilometers. Sounds similar to a train locomotive for periods of 2-5 minutes.

Ash falls are reported on the communities of Morelia, Santa Sofía, Panimache, La Rochela, Ceilán, Osuna. On the sides of the crater constant avalanches of blocks in all directions, some reaching the vegetation.

 

Source: Insivumeh

West Iceland, north of Lundarreykjadalur. - seismic swarm on 01.23.2022 - Doc. IMO

West Iceland, north of Lundarreykjadalur. - seismic swarm on 01.23.2022 - Doc. IMO

A swarm of earthquakes has been ongoing since December north of Lundarreykjadalur in West Iceland.

Vedurstofan located more than 250 earthquakes in the swarm which is IMO's strongest ever recorded in this region, both in terms of seismic energy and number of events (our records go back 30 years ).

 

Source: Kristin Jonsdottir

Lire la suite

Publié le par Bernard Duyck
Publié dans : #volcanic activity, #Sismologia, #Tectonics

According to visual feedback from the OVPF-IPGP webcams, and thanks to short gaps in the cloud mass very present on the relief of Piton de la Fournaise, at least four eruptive cracks could be observed. These cracks are located on the southern flank at the base of the terminal cone, to the southeast of the Piton Kala Pélé and to the southwest of the Château Fort crater. The lowest point of emission is around 2000 m above sea level. At 8:30 am on December 22, all four cracks were still active but the most activity was on the lower crack in altitude.

On the evening of December 22, activity focused on only one of the eruptive fissures, the one further downstream, where a cone began to form under the activity of a lava fountain of about 60 m. height.

Piton de La Fournaise - webcam Piton de Bert 22.12.2021 / 13h55 TU - OVPF

Piton de La Fournaise - webcam Piton de Bert 22.12.2021 / 13h55 TU - OVPF

Piton de La Fournaise - webcam Piton de Bert 22.12.2021 / 15:06 UT - OVPF

Piton de La Fournaise - webcam Piton de Bert 22.12.2021 / 15:06 UT - OVPF

Piton de La Fournaise - only the downstream fountain is active on the evening of December 22, with the start of the formation of a cone - OVPF

Piton de La Fournaise - only the downstream fountain is active on the evening of December 22, with the start of the formation of a cone - OVPF

Piton de La Fournaise - trémor at 23.12.2021 / 07h - Doc .OVPF

Piton de La Fournaise - trémor at 23.12.2021 / 07h - Doc .OVPF

Over the last 24 hours:

- The surface deformations do not show any particular displacement.

- Thanks to a milder weather forecast, estimates of lava flow could be established by satellite method with the HOTVOLC platform (OPGC - Clermont Auvergne university), with an average of 4-7 m3 / sec and peaks at 22 m3 / sec.

Since last night, activity has only focused on one of the eruptive cracks, the one further downstream (around 2030 m altitude), where a cone began to form.

 

A field reconnaissance was made on the morning of December 23 thanks to the assistance of the Air Section of the Gendarmerie and the PGHM. This mission made it possible to precisely locate the vent which is still active and the flow front around 9:30 am (local time):

- the lava flow, in graton, had traveled 2.2 km from its point of emission (and was located at approximately 2000 m altitude)

- the flow front was located 550 m from the southern rampart, 3.2 km from the top of the major slopes, 8.1 km from the road and 9 km from the ocean.

This mission also made it possible to recover samples of lava (slag projected by lava fountains and lava flows) which will be very useful, once analyzed, to better understand the path taken by the in-depth magma and the dynamism of the rash. At 9:30 a.m. local time, the lava fountain regime was still very active but with heights only intermittently exceeding the height of the cone, estimated at 10 m.

 

Alert level: Alert 2-1 (eruption in the enclosure)

 

Source: OVPF

Piton de La Fournaise - 12.23.2021 / 9:30 am - location of the emission center and the casting front - Doc. OVPF

Piton de La Fournaise - 12.23.2021 / 9:30 am - location of the emission center and the casting front - Doc. OVPF

Piton de La Fournaise - the eruptive cone on 12/23/2021 / 9 a.m. loc.- photoOVPF

Piton de La Fournaise - the eruptive cone on 12/23/2021 / 9 a.m. loc.- photoOVPF

Lava dome growth continues at Sheveluch, strong fumarole activity, and incandescence of the lava dome and hot avalanches accompany this process. Satellite data from KVERT showed that explosions sent ash on December 23, 2021 up to 5.7-6.0 km altitude, and the ash plume extended 31 km northeast of volcano.

The extrusive eruption of the volcano continues. Ash explosions up to 10-15 km altitude. could arise at any time. Current activity could affect international and low-flying aircraft.

 

The aviation code remains orange.

 

Source: KVERT

Sheveluch - The Growing Dome - photo archives 09.2021 / Andrew Matseevsky

Sheveluch - The Growing Dome - photo archives 09.2021 / Andrew Matseevsky

The summit eruption of the Kīlauea volcano has stopped. Depending on the size and length of recent breaks, the current break should last for several days. All recent lava activity remains confined to Halema'uma'u Crater in Hawai'i Volcanoes National Park, and there is no sign of migrating activity elsewhere on Kīlauea.
The rapid deflationary trend began yesterday, December 20, 2021 around 11 a.m. and subsided early on December 21. The volcanic tremor associated with the eruption has practically ceased and the seismic activity remains below the background noise.

The surface of the lake became crusted after a sequence of partial overturns last night. The lake has experienced a total elevation of around 69 meters since lava emerged on September 29. The total erupting volume since the start of the eruption was estimated to be around 30 million cubic meters on November 16.

 

Source: HVO Daily Report

Kilauea - Halema'uma'u - active vent on 12.20.2021 - photo S. Carr - HVO

Kilauea - Halema'uma'u - active vent on 12.20.2021 - photo S. Carr - HVO

Kilauea - Halema'uma'u - crust over the lava lake on 12.21.2021 - HVO webcam

Kilauea - Halema'uma'u - crust over the lava lake on 12.21.2021 - HVO webcam

In the Reykjanes Peninsula, the earthquakes are aligned with the SW-NE direction, directly above the intrusion that caused the eruption earlier this year. The activity has recently moved south. The main activity last night was in Litla Hrút, but now appears to be south of the Geldingadalur eruption sites.

These earthquakes all appear to be at a relatively great depth, they are all at a depth of around 6-7 kilometers, according to volcanologist Þorvaldur Þórðarson.

The most important earthquake of M4.9 took place on December 22 at 10 a.m.

 

General seismic cracks on the Reykjanes Peninsula align with the N-S direction and are connected to the boundaries of the plates that cross the peninsula. The rows of craters and intrusions on the Reykjanes Peninsula, on the other hand, are almost always laid out in this diagonal fashion.

There is some uncertainty as to what scenarios can occur, but one of the scenarios is that magma can rise to the surface quite quickly.

 

Source: IMO

Reykjanes Peninsula - seismic swarm - location and magnitude of earthquakes as of 23.12.2021 / 07:10 - Doc. IMO
Reykjanes Peninsula - seismic swarm - location and magnitude of earthquakes as of 23.12.2021 / 07:10 - Doc. IMO
Reykjanes Peninsula - seismic swarm - location and magnitude of earthquakes as of 23.12.2021 / 07:10 - Doc. IMO

Reykjanes Peninsula - seismic swarm - location and magnitude of earthquakes as of 23.12.2021 / 07:10 - Doc. IMO

Lire la suite

Publié le par Bernard Duyck
Publié dans : #volcanic activity, #Sismologia
Santiaguito - gas and ash pan from 12/17/2021 - UPV photo from CONRED - one click to enlarge

Santiaguito - gas and ash pan from 12/17/2021 - UPV photo from CONRED - one click to enlarge

Santiaguito - 12.17.2021 - incandescence at the Caliente dome, avalanches on the flanks (Insivumeh webcam) and pyroclastic flow (Conred image) - one click to enlarge

Santiaguito - 12.17.2021 - incandescence at the Caliente dome, avalanches on the flanks (Insivumeh webcam) and pyroclastic flow (Conred image) - one click to enlarge

The Santiaguito is in a period of strong extrusion of volcanic material, which accumulates in the Dome Caliente, causing a detachment of material that descends in the form of weak and moderate avalanches, on the western, southwest and eastern flanks.

Due to the unstable materials in the crater, there is a probability of generating moderate to strong pyroclastic flows, so one should not stay near or in the river beds near the slopes of the volcano.

Within this activity, weak and moderate explosions were observed, with columns of gray ash dispersing to the south, southwest, west at a distance of 20 kilometers, there is ash in the environment and on the villages of San Marcos Palajunoj, Loma Linda and the farms of this region.

 

Sources: Insivumeh & Conred

Ili Lewotolok - eruptive plume of 12/16/2021 / 6:36 a.m. - photo PVMBG / Magma Indonesia

Ili Lewotolok - eruptive plume of 12/16/2021 / 6:36 a.m. - photo PVMBG / Magma Indonesia

Ili Lewotolok - Strombolian activity on 12/16/2021 / 6:36 a.m. - photo PVMBG / Magma Indonesia

Ili Lewotolok - Strombolian activity on 12/16/2021 / 6:36 a.m. - photo PVMBG / Magma Indonesia

Mount Ili Lewotolok experienced an eruptive episode on Thursday, December 16, 2021 at 6:43 a.m. WITA, accompanied by a plume of gray to black ash, observed at ± 500 m above the summit (± 1923 m above the level of the sea), drifting west. This eruption was recorded on a seismograph with a maximum amplitude of 28 mm and a duration of 48 seconds.

On the same day at 8:26 p.m. WITA, another eruptive episode occurred, accompanied by an ash plume ± 300 m above the summit (± 1723 m above sea level). The ash column is white to gray in color with fine to moderate intensity towards the west. This eruption was recorded on a seismograph with a maximum amplitude of 13 mm and a duration of 28.9 seconds.

The eruption has continued since November 27, 2020.

 

Sources: PVMBG, Magma Indonesia and GVP

La Palma / Cumbre Vieja - 12.17.2021 / 9.30 a.m. loc. - degassing making the air quality limited in certain areas - photo InVolcan

La Palma / Cumbre Vieja - 12.17.2021 / 9.30 a.m. loc. - degassing making the air quality limited in certain areas - photo InVolcan

La Palma / Cumbre Vieja seen from the Mirador Astronómico del Llano del Jable on 17.12.2021 / 11h loc. - photo InVolcan

La Palma / Cumbre Vieja seen from the Mirador Astronómico del Llano del Jable on 17.12.2021 / 11h loc. - photo InVolcan

In La Palma, the IGN recorded 96 earthquakes in the last 24 hours at 17.12 / 09h UTC, including a few low frequency (LP) earthquakes.
46 earthquakes were located between 8-16km, 47 at more than 30km, 3 at less than 3 km., The greatest magnitude being 3.5 mbLg
No tremor observed.

No emission is observed. The Cumbre Vieja volcano continues its deactivation and relaxation, the only novelty is that many white salt crusts have formed due to the formation of precipitates of carbonates and salts, carried by the steam that comes out of hot and active areas.

Although the situation is favorable for the completion of the eruptive process, a resumption of activity cannot be excluded: the history of the eruptions shows stops of several days in the previous eruptions.

The emergency situation is maintained, as are the Civil Protection measures.

Due to the presence of toxic gases, especially in the southern zone, the UME is now joining the Civil Guard system in supporting work on the assessment and measurement of gas levels.

 

Sources: InVolcan, IGN, IGME

La Palma - seismicity at 12.17.2021 / 07:02 am - Doc. IGN - one click to enlarge

La Palma - seismicity at 12.17.2021 / 07:02 am - Doc. IGN - one click to enlarge

La Palma - RSAM of the seismic stations (legend on the left) of La Palma on 17.12.2021 - Doc. IGN - one click to enlarge

La Palma - RSAM of the seismic stations (legend on the left) of La Palma on 17.12.2021 - Doc. IGN - one click to enlarge

On Tenerife, seismic activity has been recorded at about 6-8 km in the region of Adeje and at about 8-11 km in the region of Caldera and Guia de Isora. For a fortnight. Involcan recorded 59 earthquakes in 14 days.

For 5 years, several stronger seismic swarms have occurred in this area, in October 2016, November 2017, November 2018, July 2019.

This activity is under surveillance.

 

Sources: IGN, InVolcan & Volcanes y Ciencia Hoy.

Tenerife - earthquakes of the last 90 days to 18.12.2021 - Doc. IGN.es - one click to enlarge

Tenerife - earthquakes of the last 90 days to 18.12.2021 - Doc. IGN.es - one click to enlarge

Lire la suite

Publié le par Bernard Duyck
Publié dans : #volcanic activity, #Sismologia

Given the strong activity of the Semeru volcano and the increasing distance of pyroclastic avalanche flows and lava flows, the activity level of the Semeru volcano changes from WASPADA (level II) to SIAGA (level III), from from December 16, 2021 at 11:00 p.m. WIB.

Semeru - 16.12.2021 - lahars et ash plumes

Semeru - carte des zones à risques revue au 16.12.2021- PVMBG

Semeru - carte des zones à risques revue au 16.12.2021- PVMBG

Observations sismiques du 16 décembre :

- 3 séismes d'éruption, avec une amplitude de 11 à 25 mm et une durée de séisme de 70 à 125 secondes.
- 3 séismes de coulées pyroclastiques d'avalanche, avec une amplitude de 17-25 mm et une durée du séisme de 395-912 secondes.
- 21 séismes d'avalanche avec une amplitude de 1 à 22 mm et une durée de tremblement de terre de 25 à 265 secondes.
- 7 rafales de tremblements de terre d'une amplitude de 3 à 7 mm et d'une durée de 30 à 180 secondes.
- 4 séismes tectoniques locaux; 1 tremblement de terre ressenti, échelle II MMI avec une amplitude de 23 mm, S-P n'a pas été observé et la durée du tremblement de terre était de 345 secondes.
- 7 séismes tectoniques lointains
- 2 séismes Flood Vibration avec une amplitude de 8 à 15 mm et une durée de 600 à 1440 secondes.

 
Source : PVMBG

Aerial view from the northwest overlooks Planchón-Peteroa, a complex volcano with several overlapping calderas. In the foreground on the left is the caldera wall of the Planchón volcano. The Peteroa crater complex is in the center and the Volcán Azufre is at the top right. - photo O. Gonzalez-Ferran - GVP-06930

Aerial view from the northwest overlooks Planchón-Peteroa, a complex volcano with several overlapping calderas. In the foreground on the left is the caldera wall of the Planchón volcano. The Peteroa crater complex is in the center and the Volcán Azufre is at the top right. - photo O. Gonzalez-Ferran - GVP-06930

The monitoring stations installed near the Planchon - Peteroa Volcanic Complex recorded an earthquake associated with the fracturing of the rock (Volcano - Tectonic earthquake) this Thursday 16 at 5:20 pm. Keep the alert green.

 

Source: Sernageomin

La Palma - Cumbre Vieja - degassing of the volcanic edifice on 16.12.2021 at 11:30 am loc. seen from Dos Pinos reservoir (Los Llanos de Aridane) - InVolcan

La Palma - Cumbre Vieja - degassing of the volcanic edifice on 16.12.2021 at 11:30 am loc. seen from Dos Pinos reservoir (Los Llanos de Aridane) - InVolcan

La Palma / Cumbre Vieja - dead calm and passive degassing - I Love The World 16.12.2021

La Palma / Cumbre Vieja - dead calm and passive degassing - I Love The World 16.12.2021

The eruptive process of Cumbre Vieja, according to PEVOLCA, continues to show signs of exhaustion and the visible emission of volcanic gases is punctual and sporadic and is concentrated in the eruptive centers and jameos of the volcanic tubes. No variation from the level of tremor, seismicity and gas emission associated with the volcanic plume, which are at low levels.

A total of 56 earthquakes were located on the island of La Palma, including one felt by the population.
The maximum recorded magnitude is 3.4 (mbLg), corresponding to yesterday's earthquake at 15:09 UTC, at a depth of 14 km. The minimum magnitude of the localized earthquake was 1.2 mbLg.
Localized seismicity continues under the central area of ​​Cumbre Vieja in the same areas of the last days, with dispersion. Most earthquakes (39) are located at depths between 8 and 17 km. Eleven earthquakes were also located at depths between 33 and 40 km and 6 at depths between 0 and 5 km.
Apart from this localized volcano-tectonic activity, and coinciding with the disappearance of the volcanic tremor, low frequency signals interpreted as LP events were detected in the seismic stations.

The amplitude of the tremor signal over the past 24 hours has remained at very low levels, close to the pre-eruptive period.

The island's network of permanent GNSS stations does not show a clear trend in the deformation of the stations closest to the eruptive centers.
In the rest of the stations, the slight deflation observed previously stabilized.

In view of the image calibrated at 08:45 UTC, no type of emission is visible.
The height of the cone is measured by obtaining a value of 1122 m. asl.

 

In Los Llanos de Aridane, the recommendations to the population are maintained due to the high concentration of particles and, due to the toxic gases, the need to strengthen protective measures when accessing evacuated areas is recalled. Weather forecasts indicate a prevalence of breezes and the presence of haze that may increase PM10 values ​​due to the input of desert dust.

 

Sources: IGN, IGME, DSN, RTVC, I Love The World

La Palma - seismicity at 12.17.2021 / 07:02 am - Doc. IGN

La Palma - seismicity at 12.17.2021 / 07:02 am - Doc. IGN

Lire la suite

<< < 1 2 3 4 5 6 7 8 > >>

Archives

Articles récents

Hébergé par Overblog