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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

The unrest continues at the Great Sitkin volcano. During the last day, numerous earthquakes and small explosions were recorded on local infrasound and seismic stations.

The dome has been expanding since mid-July and the last explosive event was on May 25, 2021. AVO is monitoring and using satellite imagery to measure the rate of growth. It now measures more than 100 meters in diameter.

At night, the people of Adak about 26 miles across the water report the plume of steam lit by the incandescent lava atop the dome. On August 5, local observers reported a low-level lava fountain at the active vent that was also visible from Adak Island. A robust volcanic cloud was observed in web camera views of the volcano throughout the day. This cloud extends north-northeast below about 10,000 feet above sea level. It is probably composed mainly of volcanic gases and water vapor, but could include some amount of ashes.

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

 

Source: AVO

Great sitkin - The Growing Dome on 04.08.2021 - photo courtesy Dave Ward, via AVO

Great sitkin - The Growing Dome on 04.08.2021 - photo courtesy Dave Ward, via AVO

A moderate activity continues at Karymsky, with explosions accompanied by plumes of gas and steam, moderately loaded with ash up to 2.5 km altitude. the whole week; but on August 01 and 04-05, ash plumes extended about 75 km southeast of the volcano

An explosion was seen on August 4 from the Luzon Caldera.

A thermal anomaly was reported by the Kscnet on the volcano on July 29 and 31 and August 01, 02 and 04; the other days the volcano was obscured by clouds.

The aviation code remains orange, with other explosions occurring at any time, with plumes reaching 6,000-7,000 meters.

 

Source: KVERT & KSCNET

Moderate activity continues at Karymsky, with explosions accompanied by plumes of gas and steam, moderately loaded with ash up to 2.5 km altitude. the whole week; but on August 01 and 04-05, ash plumes extended about 75 km southeast of the volcano  An explosion was seen on August 4 from the Luzon Caldera.  A thermal anomaly was reported by the Kscnet on the volcano on July 29 and 31 and August 01, 02 and 04; the other days the volcano was obscured by clouds.  The aviation code remains orange, with other explosions occurring at any time, with plumes reaching 6,000-7,000 meters.     Source: KVERT & KSCNET

Moderate activity continues at Karymsky, with explosions accompanied by plumes of gas and steam, moderately loaded with ash up to 2.5 km altitude. the whole week; but on August 01 and 04-05, ash plumes extended about 75 km southeast of the volcano An explosion was seen on August 4 from the Luzon Caldera. A thermal anomaly was reported by the Kscnet on the volcano on July 29 and 31 and August 01, 02 and 04; the other days the volcano was obscured by clouds. The aviation code remains orange, with other explosions occurring at any time, with plumes reaching 6,000-7,000 meters. Source: KVERT & KSCNET

In the Reykjanes peninsula, the tremor of the eruption of Fagradalsfjall is more fluctuating at the beginning of August, but it starts to increase gradually on August 5.

On August 5 in the morning, the webcams let see an incandescence at the level of the crater and a notable degassing on the lava field.

In the evening, lava comes out of the crater in Geldingadalur, and flows in a few branches and waterfalls in Meradalur, ... the crater rim collapsed considerably yesterday, and the lava may have found new flowings ways.

Around 11 p.m., we cannot doubt the continuation of the eruption.

 

Sources: Visir webcams, mbls, Almannavarnir and RUV / Böðvar Sveinsson

Fagradalsfjall - tremor at 06.08.2021 - Doc Hraun.vedur

Fagradalsfjall - tremor at 06.08.2021 - Doc Hraun.vedur

Fagradalsfjall - incandescence at the crater on 04.08.2021 / 11:29 pm - Visir webcam - one click to enlarge

Fagradalsfjall - incandescence at the crater on 04.08.2021 / 11:29 pm - Visir webcam - one click to enlarge

Fagradalsfjall - on 05.08.2021 / 01h51 - Visir webcam - one click to enlarge

Fagradalsfjall - on 05.08.2021 / 01h51 - Visir webcam - one click to enlarge

Fagradalsfjall - strong degassing in the lava field 05.08.2021 / 07h20 - webcam langihryggur NV - one click to enlarge

Fagradalsfjall - strong degassing in the lava field 05.08.2021 / 07h20 - webcam langihryggur NV - one click to enlarge

Fagradalsfjall - lava comes out of the crater and forms new flows 05.08.2021 / 22h29 - mbls webcam - one click to enlarge

Fagradalsfjall - lava comes out of the crater and forms new flows 05.08.2021 / 22h29 - mbls webcam - one click to enlarge

Sunny spells on the small islands of Papua New Guinea at the beginning of August allowed satellite images / Sentinel-2 for Manam and Kadovar

Regarding Manam, Mirova reports moderate thermal anomalies between August 2 and 5, of VRP between 4MW and 71MW, while the Sentinel-2 images show a degassing towards the west, then towards the OSO.

Concerning Kadovar, a degassing towards the ONO and the vapor remaining in the lower layers, as well as a slight hot spot are visible by Sentinel-2

 

Sources: Sentinel-2 & Mirova

Manam - degassing 02.08.2021 - image Sentinel-2 bands 12,11,4 - one click to enlarge

Manam - degassing 02.08.2021 - image Sentinel-2 bands 12,11,4 - one click to enlarge

Manam - Thremic anomalies at 05.08.2021 - Doc. Mirova MODIS_Latest10NTI

Manam - Thremic anomalies at 05.08.2021 - Doc. Mirova MODIS_Latest10NTI

Kadovar - image Sentinel-2 bands 12,11,4 du02.08.2021 - one click to enlarge

Kadovar - image Sentinel-2 bands 12,11,4 du02.08.2021 - one click to enlarge

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Publié le par Bernard Duyck
Publié dans : #volcanic activity
Pacaya - ash plume 800 m high on 04.08.2021 / 2:00 p.m. - Doc. Insivumeh

Pacaya - ash plume 800 m high on 04.08.2021 / 2:00 p.m. - Doc. Insivumeh

The Pacaya volcano presents the characteristics of a new phase of activity after almost 4 months of low activity. The volcano could have a continuous explosive behavior, with formation of lava flow and eruptive plumes.

On August 4, a constant degassing was observed, and in addition there were 3 moderate explosions (9:05 a.m., 1:40 p.m. and 2:21 p.m. local time), which expelled columns of ash at an altitude of 3,500 m, with a displacement towards the north, at a distance of about 12 kilometers, reporting ash fall in the communities of Mesías Altas, Mesías Bajas and Villa Canales.

The Mackenney Cone crater has undergone significant changes since the last eruptive phase, having destroyed the cinder cones and lava flows that filled its interior, showing a crater of 100m depth ; ashes emanate from deep. Around the crater there are a few cracks, so the area is considered unstable.

Pacaya - the 3 explosions of 04.08.2021 on this seismogram - Doc. Insivumeh

Pacaya - the 3 explosions of 04.08.2021 on this seismogram - Doc. Insivumeh

The ascent to the Mackenney crater is prohibited. It is recommended not to visit the cracks in areas affected by recent lava flows on the northern flank.

It is recommended to take precautions with air traffic in the region of the Pacaya volcano, due to the presence of ash in the volcanic perimeter, at a height of 3,500 m above sea level (11,482 feet), in a north direction, northeast, at a distance of 12 kilometers.

 

Source: Insivumeh

Etna crater NE - ash emission this 04.08.2021 - photo Salvatire lo Giudice

Etna crater NE - ash emission this 04.08.2021 - photo Salvatire lo Giudice

The INGV reports that from 11:50 UTC on August 4 a discontinuous emission of ash from the northeast crater of Etna is observed.

The volcanic cloud produced reaches a height of about 6000 m above sea level and, according to the forecast model, disperses in the NE direction.

The temporal trend of the mean amplitude of the volcanic tremor does not show significant variations and the values ​​remain low. The center of gravity of the volcanic tremor sources is located in correspondence with the south-eastern crater at an altitude of about 2,900 m above sea level. The infrasonic activity remains at low levels with events localized in correspondence with the Bocca Nuova. High Frequency GNSS Network Data does not show significant changes

At 19:35 UTC, ash emissions from the northeast crater ceased.

 

Source: INGV OE

Nyiragongo - hot spot in the crater - image Sentinel-2 bands 12.11.8A - via Mounts project - one click to enlargeNyiragongo - hot spot in the crater - image Sentinel-2 bands 12.11.8A - via Mounts project - one click to enlarge

Nyiragongo - hot spot in the crater - image Sentinel-2 bands 12.11.8A - via Mounts project - one click to enlarge

At Nyiragongo, a small hot spot was visible on a Sentinel-2 image from July 26 (located on the eastern edge of the crater - hot gases?),

and Charles Balagizi reports a plume of ash and gas above the central crater on August 4, 2021 at 2:20 p.m. local time.

 

Source: GVO in the weekly report of the Global volcanism program

Whakaari / White island - surveillance flight on 04.08.2021: gas and steam plume - via Brad Scott / Twitter

Whakaari / White island - surveillance flight on 04.08.2021: gas and steam plume - via Brad Scott / Twitter

During a surveillance overflight onAug. 4, Brad Scott / GeoNet reports hot steam and gas emissions continuing from the 2019 extrusion area at Whakaari / White Island.

High levels of gas emissions continue, but the ratio of carbon dioxide to sulfur dioxide has declined. A more detailed assessment of this observation supports the presence of shallow magma.
There is still great uncertainty about the mechanisms that drive current activity. Most of the scenarios are consistent with a slightly increased level of unrest at Whakaari / White Island and the Volcanic Alert Level remains at 2 (moderate to increased unrest) and the aviation color code at yellow. There is no obvious sign of eruptive activity.

 

Source: Brad Scott and GeoNet

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Publié le par Bernard Duyck
Publié dans : #volcanic activity
Merapi - pyroclastic flow of collapse on 08/04/2021 / 05h41 - photo BPPTKG

Merapi - pyroclastic flow of collapse on 08/04/2021 / 05h41 - photo BPPTKG

A white plume was observed at the main crater of Merapi, with moderate to thick intensity, about 100 meters from the summit on August 3, 2021.

The seismicity of August 3 is characterized by:

- 151 collapse earthquakes, with an amplitude of 3 to 40 mm and a duration of 7 to 120 seconds.
- 11 blast / emission earthquakes, with an amplitude of 3 to 6 mm and a duration of 9.3 to 17 seconds.
- 450 hybrid / multiphase earthquakes
- 80 shallow volcanic earthquakes, with an amplitude of 9 to 75 mm and an earthquake duration of 3 to 28 seconds.
- 2 distant tectonic earthquakes with an amplitude of 3 mm, S-P 31.6 seconds and an earthquake duration of 112-129 seconds.


The activity level remains at 3 / Standby, with recommendations not to be in danger zones.
The current potential danger consists of lava avalanches and hot clouds in the south-east-south-west sector for a maximum of 3 km to the Woro river and 5 km to the Gendol, Kuning rivers, Boyong, Bedog, Krasak, Bebeng and White. During this time, the ejection of volcanic material in the event of an explosive eruption can reach a radius of 3 km from the summit.

Merapi - seismicity at 03.08.2021 - Doc. BPPTKG


On August 4 at 5:41 am WIB, we can observe on webcams a plume of moderate to thick intensity, reaching 400 m. above the summit. A pyroclastic flow of collapse left a trace on the 16 mm seismogram. Amplitude, lasting 141 sec.

 

Sources: PVMBG, Magma Indonesia and BPPTKG

Ili Lewotolok - eruptive plume of 04.08.2021 / 09:21 WITA - webcam PVMBG

Ili Lewotolok - eruptive plume of 04.08.2021 / 09:21 WITA - webcam PVMBG

An eruptive episode marked the Ili Lewotolok on Wednesday 04 August 2021 at 09:19 WITA, with an ash plume observed at ± 1300 m above the summit (± 2723 m above sea level). We observe that the ash column is gray to black with a thick intensity, leaning towards the west. This eruption was recorded on a seismograph with a maximum amplitude of 28 mm and a duration of 41 seconds.

 

Source: PVMBG, Magma Indonesia

Reventador - activity on 03.08.2021 / 13:36 UTC - IGEPN webcam

Reventador - activity on 03.08.2021 / 13:36 UTC - IGEPN webcam

At Reventador, several ash emissions were observed in a westerly and north-westerly direction, this August 3, 2021, reaching up to 800 meters above the crater level. The Washington VAAC issued 3 alerts of emissions observed on the satellites, its direction was maintained towards the northwest and the heights did not exceed 800 meters above the level of the crater.


Seismicity is characterized between August 2 and 3 at 11 a.m. by 91 explosion earthquakes, 75 LP earthquakes, 10 emission tremor episodes, and one harmonic tremor episode.
Neither FIRMS nor MIROVA have logged any thermal alerts in Reventador in the past 24 hours.
In the afternoon and night of yesterday, the volcano was repeatedly cleared and incandescence was observed in the crater.

 

Source: IGEPN

Sabancaya - activity report from July 26 to August 1, 2021 - Doc. I.G. Peru

Sabancaya - activity report from July 26 to August 1, 2021 - Doc. I.G. Peru

Sabancaya maintained moderate volcanic activity between July 26 and August 1, with an average of 54 explosions per day, accompanied by ash plumes reaching up to 2,000 meters above the summit.

I.G.P. detected and analyzed 1,170 earthquakes of volcanic origin associated with the circulation of internal magmatic fluids. During the same period, VT earthquakes associated with rock fracturing, of magnitudes between 2.7 and 3.9, occurred mainly in the north and southwest areas.

The deformation does not present any significant anomaly. Five thermal anomalies were identified, with a VRP max. of 13 MW, attesting to the presence of a surface lava body in the crater.

The volcanic alert remains in Naranja, with an inaccessible area of ​​12 km radius around the crater.

 

Source: I.G. Peru

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Publié le par Bernard Duyck
Publié dans : #volcanic activity

The Ovsicori reports the detection of a bubbling at the northern mouth of Lake Poas. Frequent gurgling pulses are still observed in the lake near Crater A, along with frequent short shaking. A slight extension of the crater continues to be detected. Gas ratios remain stable.

On August 2, the aerial fumaroles on the north and east walls of the crater are active, as are the sub-lacustrine fumaroles to the south and north of the lake. Frequent low-frequency volcanic earthquakes and short-lived tremors associated with fumarole activity are recorded. The gas concentrations are measured in small quantities and the deformation of the volcanic building remains stable.

 

Source: Ovsicori

Poas - evening bubbling and convection cells - Doc. Ovsicori 07.31.2021

Poas - evening bubbling and convection cells - Doc. Ovsicori 07.31.2021

In July 2021, the OVPF recorded at the Piton de La Fournaise massive a total of:

- 33 superficial volcano-tectonic earthquakes (0 to 2.5 km above sea level) under the summit craters;

- 0 deep earthquake (below sea level)

- 256 collapses (in the Dolomieu Crater, the ramparts of the Fouqué enclosure, Piton de Crac, and the East River).

The inflation of the building, which began in April 2021, continued throughout July 2021. This inflation showed a pressurization of the superficial magmatic reservoir located around 2 km deep.

Piton de La Fournaise - Deformation from June 2 to August 2, 2021 - Here are shown the base lines (variation in distance between two GPS receivers) crossing the Piton de la Fournaise building, at the top (top), at the base of the terminal cone (in the middle) and in the far field (below) (cf. location on the associated maps). An increase is synonymous with elongation and therefore swelling of the volcano; conversely, a decrease is synonymous with contraction and therefore deflation of the volcano. Any periods colored in light pink correspond to eruptions. - Doc. OVPF

Piton de La Fournaise - Deformation from June 2 to August 2, 2021 - Here are shown the base lines (variation in distance between two GPS receivers) crossing the Piton de la Fournaise building, at the top (top), at the base of the terminal cone (in the middle) and in the far field (below) (cf. location on the associated maps). An increase is synonymous with elongation and therefore swelling of the volcano; conversely, a decrease is synonymous with contraction and therefore deflation of the volcano. Any periods colored in light pink correspond to eruptions. - Doc. OVPF

Following the eruption of December 2020, a continuous increase in CO2 emissions from the soil was recorded at the level of the distal sites (Plaine des Cafres sectors) but also proximal (Gîte du volcano). At remote sites, a trend reversal (decrease in CO2 emissions) occurred on February 12, 2021, witnessing a possible transfer of magma to more superficial crustal levels. A further increase followed this phase, with the largest increase recorded between April 4 and April 16. At the proximal sites, the increase was continuous until early May, heralding the onset of the long-lasting rash from April 9 to May 24, 2021.

In June 2021, a new trend of increasing CO2 fluxes was recorded both in the far field, and to a lesser extent in the near field (monthly bulletin for the month of June 2021). Since the distant field CO2 fluxes are stable on high values.

 

The inflation of the building and the CO2 contents in the soil which remained high in July 2021 witnessed magmatic transfers from deep areas to the superficial magmatic reservoir which continued after the end of the eruption of April 9-May 25, 2021.

 

Source: OVPF Monthly bulletin

Piton de La Fournaise - the Dolomieu crater - photo archives © Bernard Duyck

Piton de La Fournaise - the Dolomieu crater - photo archives © Bernard Duyck

Since July 31, 2021 at 4:33 p.m. (UTC time; 7:33 p.m. local time), strong seismic activity of the Long-Period (LP) type has been recorded in Mayotte.

For the day of July 31, 186 LP type earthquakes were recorded during 3 distinct swarms, each associated with a Very Long Period (VLP) type earthquake. LP and VLP earthquakes are seismic signals usually associated in the literature with resonances and fluid movements (magmatic or hydrothermal) at depth. Work is underway to try to better understand these signals. Some of these LP earthquakes are located about ten kilometers east of Petite-Terre in the area of ​​the most active proximal seismic swarm, about thirty km deep, at the same place where LP earthquakes are usually localized (REVOSIMA monthly bulletins).

These earthquakes are small in magnitude and were not felt by the population. A new swarm started on August 2 at 13:31 (UTC time; 16:31 local time) and is still in progress.

REVOSIMA closely follows this activity and its development.

 

Source: REVOSIMA - Exceptional press release 02.01.2021

Mayotte - location of earthquakes in time and theoretical idea of ​​the mode of activity - Doc. S. Hicks 2018 - one click to enlarge

Mayotte - location of earthquakes in time and theoretical idea of ​​the mode of activity - Doc. S. Hicks 2018 - one click to enlarge

In recent days, the Siglagah crater in the hamlet of Rejosari, village of Pranten, on the Dieng plateau, central Java has again emitted a torrent of mud.
Siglagah Crater is approximately 200 meters from the residential areas of the Dieng Plateau

According to the official statement from the PVMBG, on July 30, 2021, the Siglagah crater spat mud within a radius of less than 10 meters from the source. The center of activity is in one of the fractures in the Siglagah crater region which sits on the hillside.

The activity level is at 1 / normal.

 

Sourcess: PVMBG and TribunJateng.com / Siglagah Crater Spewing Mud, Dieng Volcano Activity Still Normal Level.

Dieng plateau - activity of the kawah Siglagah on 02.08.2021 (fumarole and mud splashes in the insert at the top right) - Doc. PVMBG via TribunJateng

Dieng plateau - activity of the kawah Siglagah on 02.08.2021 (fumarole and mud splashes in the insert at the top right) - Doc. PVMBG via TribunJateng

The Dieng plateau is an active area - the Sileri crater on 02.08.2021 / 07:27 WIB - Doc. PVMBG

The Dieng plateau is an active area - the Sileri crater on 02.08.2021 / 07:27 WIB - Doc. PVMBG

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Publié le par Bernard Duyck
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Stromboli - explosion of 01.08.2021 / 20:01 UTC - webcam therm INGV

Stromboli - explosion of 01.08.2021 / 20:01 UTC - webcam therm INGV

Stromboli - loud explosion on 08/01/2021 / 10:01 p.m. loc. - LGS webcam

Stromboli - loud explosion on 08/01/2021 / 10:01 p.m. loc. - LGS webcam

At 20:01 UTC / 22:01 local, the surveillance network recorded a larger than usual explosive event in the area of ​​the terrace of the Central / Central-South crater of Stromboli.

Analysis of the images indicated that the eruptive activity produced a significant emission of materials which reached heights of over 150 meters at the mouth and which dispersed beyond the crater terrace, affecting the area. of Pizzo and rolling along the Sciara del Fuoco. After the explosive event, no change in explosive activity was recorded.
Seismically, the explosive event at 20:01 UTC is clearly visible at all seismic stations in Stromboli. Regarding the amplitude of the volcanic tremor, a sharp increase was observed from 19:50 UTC with a maximum peak on high values ​​around 20:00 UTC. Currently, the amplitude of the tremor has returned to medium-low values.
Strain signals from GNSS and Stromboli clinometric networks show no significant variation associated with the explosive event

 

Sources: INGV OE & LGS

Stromboli - loud explosion on 01.08.2021 / 20:01 UTC - 22:01 loc. - Webcam Shelter-750 LGS

Stromboli - loud explosion on 01.08.2021 / 20:01 UTC - 22:01 loc. - Webcam Shelter-750 LGS

The effusive-explosive eruption of Nevados de Chillan continues at unchanged moderate levels.
Two lava flows remain active, L5 and L6, and continue to spread on the NE slopes as visible in the attached image.

A new lava flow formation began to emerge from the summit vent on July 27 and continues to descend on the NE flanks adjacent to the already known L5 / L6 flows.
An almost constant glow visible from the summit crater at night indicates the rise of a batch of magma.
The volcano continues its intermittent moderate explosions from the summit vent. An ash plume rose 1,800 feet (560 m) above the summit and drifted northeast.

 

Source: Sernageomin

Nevados de Chillan - lava flows on 07/27/2021 - flow limits in red / L5 and in green / L6 - new lobe between the two active lava flows - Doc. Sernageomin - one click to enlarge

Nevados de Chillan - lava flows on 07/27/2021 - flow limits in red / L5 and in green / L6 - new lobe between the two active lava flows - Doc. Sernageomin - one click to enlarge

Nevados de Chillan - 08/01/2021 / 6:10 p.m. - webcam Portezuelo Sernageomin

Nevados de Chillan - 08/01/2021 / 6:10 p.m. - webcam Portezuelo Sernageomin

At 11:33:00 local time on July 31, 2021, an eruption was recorded in the Rincon de la Vieja volcano, the height reached by the column is unknown due to the visibility conditions of the site.
Duration of activity: 2 minutes.


Seismic activity is weaker than yesterday.
Wind direction is unknown at this time.
After this small eruption, the tremor disappeared although, for 2-3 hours, around 12h, a discontinuous tremor of frequency 1-3hz was detected. Geodetic observations show a slight tendency to extend.

 

Source: Ovsicori

Rincon de La Vieja - summit crater lake - photo archives Rincon de La Vieja / FB

Rincon de La Vieja - summit crater lake - photo archives Rincon de La Vieja / FB

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This July 31, 2021 from around 5.15 p.m. UTC, Strombolian activity is observed at the level of the south-eastern crater of Etna, following a rapid increase in the tremor from 5 p.m. UTC.
The activity is currently confined to the crater and generates discontinuous and light ash emissions which are dispersed in the summit area.
From 17:50 UTC, the increase in explosive activity at the level of the southeast crater is signaled by the INGV, and produces an ash cloud which reaches 5 km above sea level and disperses in the SE direction.

Etna SEC- Fountaining on 07.31.2021 / evening - photo Boris Behncke

Etna SEC- Fountaining on 07.31.2021 / evening - photo Boris Behncke

Around 19:15 UTC a lava flow is observed which is propagating in a southwest direction.
The observatory signals at 11:22 p.m. (9:22 p.m. UTC) the gradual passage of Strombolian activity towards the shape of a lava fountain at the level of the southeast crater. Based on the forecast model, the eruptive cloud produced by the current activity disperses in the eastern sector and marginally in that to the south of the volcano; the lava flow produced by the ongoing activity at the Southeast Crater continues to feed and propagate in the SW direction, when the lava front has reached an altitude of about 2,800 m above the sea ​​level.
The amplitude of the volcanic tremor is on high values ​​with an increasing trend.
The last location of the tremor, at 20:45 UTC, is near the southeast crater at a depth of about 3,000 m above sea level.

Etna SEC - activity from 07.31.2021 / 10:39 p.m. - webcam2 LAVE

Etna SEC - activity from 07.31.2021 / 10:39 p.m. - webcam2 LAVE

Etna - Thermal anomalies at 08/01/2021 / 00h50 - Doc. Mirova MODIS_logVRP

Etna - Thermal anomalies at 08/01/2021 / 00h50 - Doc. Mirova MODIS_logVRP

Etna - variation of the tremor at 01.08.2021 / 05h - Doc. INGV OE

Etna - variation of the tremor at 01.08.2021 / 05h - Doc. INGV OE

The lava fountain in the southeast crater ceased at around 11:30 p.m. UTC; a weak strombolian activity continues with a modest emission of ash. The lava flow which extends in the SW direction continues to be fed, another lava flow is also observed which extends along the northern flank of the Southeast crater.

 

Source: INGV OE

Semosopochnoi - degassing at the Cerberus cone - AVO / Cyrus Read archives 06.08.2021

Semosopochnoi - degassing at the Cerberus cone - AVO / Cyrus Read archives 06.08.2021

The seismic activity of the Semisopochnoi has increased in recent days, particularly marked during the last 8 hours. Increased activity was also detected on local infrasound stations, suggesting possible low level emissions (below 10,000 feet above sea level).

Due to this increase in activity, AVO is increasing the Aviation Color Code to ORANGE and the Alert Level to WATCH on July 31 at 10:19 AKDT.

When they do occur, small eruptions producing minor ash deposits near the active north crater of Mount Cerberus and ash clouds within 10,000 feet above sea level are typical of activity at Semisopochnoi.

 

Source: AVO

Karymsky - photo Press Service of the Main Directorate of the Russian Emergency Ministry for the Territory of Kamchatka / 01.08.2021

Karymsky - photo Press Service of the Main Directorate of the Russian Emergency Ministry for the Territory of Kamchatka / 01.08.2021

This August 1, 201, the Karymsky volcano emitted an ash plume at a height of 2,000 m.asl.

According to the Kamchatka Volcanic Eruption Response Group and the Kamchatka branch of the geophysical service of the Russian Academy of Sciences, to which the rescue department refers, the ash plume was transported in a southeast direction at a distance of 55 kilometers towards Kronotsky Bay.

The activity continues, which could affect aviation, which justifies the maintenance of Code Orange.

 

Sources: KVERT & https://rg.ru/

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In Fagradalsfjall, the eruption continues, at the rate of the usual fluctuations of the tremor for several days. Some pictures are better than a long description.

Lava flows in Meradalur.

Fagradalsfjall - the active cone in Geldingadalur on 07/30/2021 / 08:08 - video Hjörleifur Jóhannesson

Fagradalsfjall eruption - Timelapse 30th July 2021- Visir video

Fagradalsfjall - tremor at 07.31.2021 - doc. Hraun.vedur.is

Fagradalsfjall - tremor at 07.31.2021 - doc. Hraun.vedur.is

As the eruption on the Reykjanes Peninsula continues, the Katla is joining the news in its own way.

On the evening of July 29, two earthquakes of magnitude 3.2 occurred at 7:20 p.m. and 7:22 p.m. about 30 smaller earthquakes followed.

Despite the seismic activity, no changes were detected in the flow or conductivity of water on local rivers, including Múlakvísl.

Met Office natural hazards specialist Bjarki Kaldalón Friis believes the Katla earthquakes were likely caused by the summer melting of the Mýrdalsjökull glacier that covers the volcano.

 

Sources: RUV, IMO

Mýrdalsjökull - location and magnitude of earthquakes as of 30-31.07.2021 - Doc. IMO
Mýrdalsjökull - location and magnitude of earthquakes as of 30-31.07.2021 - Doc. IMO
Mýrdalsjökull - location and magnitude of earthquakes as of 30-31.07.2021 - Doc. IMO

Mýrdalsjökull - location and magnitude of earthquakes as of 30-31.07.2021 - Doc. IMO

The Mýrdalsjökull glacier which covers the Katla volcano - photo RUV

The Mýrdalsjökull glacier which covers the Katla volcano - photo RUV

In the Mariana Volcanic Arc, ground observations from local residents indicate that there were felt earthquakes and light emissions from Mount Pagan north around 4.30am UTC on July 29, 2021.

Due to the increase in activity, aviation color code / volcanic alert status changed to YELLOW / ADVISORY. Seismic data, infrasound and web cameras from the Pagan volcano remain unavailable. No activity observed on satellite images during the past week.

The current volcanic alert is Advisory and the aviation code is Yellow

The last eruptive activity in Pagan dates back to the period from October 30 to December 11, 20212 (GVP)

 

Sources: USGS Volcano Hazards Program & Global Volcanism Program

Location of Pagan in the volcanic arc of the Marianas - Doc. GVP

Location of Pagan in the volcanic arc of the Marianas - Doc. GVP

Pagan island - North Pagan steam plume on 03/06/2012 - Astronaut photograph ISS030-E-122047. Courtesy of NASA-JSC.

Pagan island - North Pagan steam plume on 03/06/2012 - Astronaut photograph ISS030-E-122047. Courtesy of NASA-JSC.

The VAAC Darwin issued a volcanic ash emission advisory and an aviation code Yellow for the Bagana / PNG on Bougainville Island on July 31, 2021 at 5:15 a.m.

The ashes are reported at an altitude of flight 150, moving west. Steam emissions, containing little ash were observed this morning by the Himawari-8 satellite; the observation was no longer possible afterwards because of the cloud cover.

 

The GVP reports the eruption in progress since February 28, 2000.

 

Sources: VAAC Darwin and Global Volcanism Program

Bagana - image Sentinel-2 bands 4,3,2 and 12,11,8A from 07/31.2021 / 12:07 am via Mounts project

Bagana - image Sentinel-2 bands 4,3,2 and 12,11,8A from 07/31.2021 / 12:07 am via Mounts project

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Publié le par Bernard Duyck
Publié dans : #volcanic activity

In Chile, the Nevados de Chillan volcanic complex was rocked by numerous LP earthquakes, associated with internal fluid dynamics on July 29.

The Sernageomin reports an earthquake at 5:10 a.m. local, 4 earthquakes at 5:23 a.m. local, an earthquake at 8:33 a.m. local / 12:33 UTC which was accompanied by a plume at 780 meters above the point of emission, and another at 9:01 a.m. local .

The alert level remains at amarilla.

 

Source: Sernageomin

Nevados de Chillan - explosion on 07/29/2021 / 1:02 p.m. UTC - webcam Portezuelo / Sernageomin

Nevados de Chillan - explosion on 07/29/2021 / 1:02 p.m. UTC - webcam Portezuelo / Sernageomin

The JMA reported explosions in progress at the Ontake crater of Suwanosejima from July 19 to 26, as well as visible incandescence on certain nights at the crater.

There were 31 explosions recorded on July 22, after two days without an explosion. An explosion at 3 p.m. on July 23 produced an ash plume that rose 1.6 km and ejected bombs 200 m. The eruption plumes from July 23 to 26 reached 2.3 km; it was not known if any bombs had been thrown from the crater due to the weather conditions. The alert level remained at 3 and the public was warned to stay 2 km from the crater. (JMA via GVP)

Suwanosejima - 07.17.2021 / 07:55 - 08:00 - JMA webcam

Suwanosejima - 07.17.2021 / 07:55 - 08:00 - JMA webcam

For the day of July 29, the JMA reports an explosion at 4:46 p.m., with a plume at 3,300 m. above the crater. An explosion at 5:16 p.m. was accompanied by a plume at 1,100 m. above the crater. Another, at 10:27 p.m. was accompanied by a plume at 2,900 m. above the rim of the crater; the ashes fell on the northwest of the volcano, including a large quantity on the village of Toshima.

The Japan Meteorological Agency said: “It is unlikely that an eruption affecting more than 1 km from the crater will occur.

On the morning of the 29th, the eruption alert level was lowered from 3 to 2 / with restrictions in the crater area. However, large volcanic bombs are likely to fall within a radius of about 1 km from the crater. The activity continues.

 

Sources: JMA and GVP / Gloval Volcanism Program - weekly report

Suwanosejima - eruptive plume of 07/29/2021 / 4:58 p.m. - via Mbc .jp

Suwanosejima - eruptive plume of 07/29/2021 / 4:58 p.m. - via Mbc .jp

Suwanosejima -29.07.2021 / 5:18 pm-5:20 pm - JMA webcam

Suwanosejima -29.07.2021 / 5:18 pm-5:20 pm - JMA webcam

The University of Iceland's Institute of Earth Sciences this week made new lava flow measurements released during the Fagradalsfjall volcanic eruption on the Reykjanes peninsula on July 27. Comparison with old data indicates that the power of the eruption increased again after a quiet period.

As the data from the July 19 in-flight survey is not fully comparable, the data is now compared to the overall mapping carried out on July 2. The average lava flow over the period July 2 - July 27 (25 days) is 11 m³ / s. For comparison, a closer look at the July 19 data, obtained with TF-FMS profile measurements and lava field signal measurements, indicates that the average flow rate is 2.-19. July was between 8 and 9 m³ / s. The figures for both measures are shown in the graph.

The lava emitted is now estimated at 109 million cubic meters and the covered area of ​​4.3 square kilometers. No lava has flowed in Geldingadalur, Nátthaga and Syðri Meradalir for more than three weeks as of July 27; the lavas emitted concern the valley of Meradalur.

A week ago, it was declared here that the rash was diminishing. The measurements of July 2 and 19 as well as the observations in Meradalir have shown this. But the latest measurement indicates that the lava flow has increased again, as the average thickness at Meradalir over the past 8-10 days has been around 1 meter per day. Therefore, there is no way now to predict the end of the rash.

 

Source: University of Iceland, Institute of Earth Sciences.

Fagradaslsfjall eruption - parameters as of 27.07.2021 - Doc. Jardvis

Fagradaslsfjall eruption - parameters as of 27.07.2021 - Doc. Jardvis

Fagradalsfjall - activity from 07.30.2021 / 04h00 - webcam_langihryggur NV

Fagradalsfjall - activity from 07.30.2021 / 04h00 - webcam_langihryggur NV

Fagradalsfjall - variations of the tremor at 07/30/2021 - Doc. Hraun.vedur

Fagradalsfjall - variations of the tremor at 07/30/2021 - Doc. Hraun.vedur

The eruption continues at Ili Lewotolok on Lembata, east of Nusa Tenggara.

It should be noted that the incandescent emissions caused forest and brush fires in the surroundings this Wednesday, July 28.

 

Source: PVMBG and Magma Indonesia

Ili Lewotolok - 07.30.2021 / 08:41 AM WITA - webcam PVMBG / Magma Indonesia

Ili Lewotolok - 07.30.2021 / 08:41 AM WITA - webcam PVMBG / Magma Indonesia

Ili Lewotolok - fires on the flanks of the volcano following the incandescent fallout on 07.28.2021 - photos PVMBG / Magma Indonesia - one click to enlarge
Ili Lewotolok - fires on the flanks of the volcano following the incandescent fallout on 07.28.2021 - photos PVMBG / Magma Indonesia - one click to enlargeIli Lewotolok - fires on the flanks of the volcano following the incandescent fallout on 07.28.2021 - photos PVMBG / Magma Indonesia - one click to enlarge

Ili Lewotolok - fires on the flanks of the volcano following the incandescent fallout on 07.28.2021 - photos PVMBG / Magma Indonesia - one click to enlarge

Happy birthday to IPGP - Institut de Physique du Globe de Paris - for the Centenary of its creation.

The institute was activated by decree of the President of the French Republic Alexandre Millerand on July 28, 1921.

Activity of Nevados de Chillan, Suwanosejima, Fagradalsfjall, and Ili Lewotolok.

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Publié le par Bernard Duyck
Publié dans : #volcanic activity

Small fever in the volcanoes of southern Italy: Etna and Stromboli respond to each other.

Stromboli - 07.28.2021 / 2:51 p.m. - strong explosion and relapse in Sciara del Fuoco - INGV webcam

Stromboli - 07.28.2021 / 2:51 p.m. - strong explosion and relapse in Sciara del Fuoco - INGV webcam

On July 28, 2021 at 14:47 UTC / 16:47 local, the Stromboli surveillance network recorded an explosive event energetically more intense than usual in the area of ​​the terrace of the Central / Central-South crater. The products of the explosive activity dispersed radially in the area of ​​the crater terrace with relapse along the Sciara del Fuoco and in the Pizzo area.

Stromboli - 07.28.2021 / 2:51 p.m. - telecamera termica ROC via LGS

Stromboli - 07.28.2021 / 2:51 p.m. - telecamera termica ROC via LGS

Stromboli - 07.28.2021 / 2:51 pm - telecamera visibile LBZ via LGS

Stromboli - 07.28.2021 / 2:51 pm - telecamera visibile LBZ via LGS

Seismically, the explosive event at 14:47 UTC is clearly visible at all seismic stations in Stromboli. Regarding the amplitude of the volcanic tremor, an increase was observed from 14:00 UTC. Currently, the magnitude of the tremor is on medium-high values.
No significant variation is observed in the distortion signals of the GPS and clinometric networks of Stromboli.

 

Sources: INGV OE & LGS

Etna - variations of the tremor at 07.29.2021 / 06h - Doc. INGV OE

Etna - variations of the tremor at 07.29.2021 / 06h - Doc. INGV OE

Etna SEC - 07.28.2021 / 9:30 a.m.loc. - new webcam LAVE

Etna SEC - 07.28.2021 / 9:30 a.m.loc. - new webcam LAVE

Etna SEC - 07.28.2021 / 2:00 p.m. - LAVE webcam 2

Etna SEC - 07.28.2021 / 2:00 p.m. - LAVE webcam 2

The INGV reports this July 28 from 07:25 UTC a resumption of Strombolian activity at the level of the south-eastern crater of Etna; it remains confined in the crater and generates discontinuous and light ash emissions in the summit area.

Around 07:40 UTC the average amplitude of the volcanic tremor of Etna showed a sudden increase reaching high values.

The source of the quake is located in the craters of Bocca Nuova and the southeastern crater at an altitude of about 2800 m above sea level.
The infrasonic activity is increasing and is located in the south-eastern crater.
For the moment, the distortion signals of the permanent GNSS and clinometric networks do not show significant variations.

 

Source: INGV OE

Great Sitkin - the crater with his dome and the steam plume 07.26.2021 / 10:36 PM UTC - Doc. AVO - DigitalGlobe via NextView license / Matt Loewen

Great Sitkin - the crater with his dome and the steam plume 07.26.2021 / 10:36 PM UTC - Doc. AVO - DigitalGlobe via NextView license / Matt Loewen

Great Sitkin - the lava dome surrounded by fumaroles - photo 26.07.2021 / 22:36 UTC - Doc. Geo Eye 1 - AVO / Matt Loewen

Great Sitkin - the lava dome surrounded by fumaroles - photo 26.07.2021 / 22:36 UTC - Doc. Geo Eye 1 - AVO / Matt Loewen

Unrest continues at Great Sitkin volcano over the past day. Small earthquakes were detected over the past day, but no explosive activity was observed in the seismic or infrasound data. High surface temperatures have been observed in satellite data over the past day. A steam plume was observed drifting northward in satellite data.

Recent images have shown a new lava dome in the Great Sitkin crater. Seen on July 26, 2021, it measures ~ 130 m in diameter, and it has been growing since July 22, when an uplift zone of 50 meters in diameter was revealed by the AVO.

Great Sitkin is in the Aleutians 42 km away. E from Adak, and is currently on ORANGE / WATCH alert.

 

Source: Avo / Image: DigitalGlobe via NextView license

Fagradalsfjall - The eruption seen from Keflavik - photo Hilmar Bragi Bárðarson 07.29.2021

Fagradalsfjall - The eruption seen from Keflavik - photo Hilmar Bragi Bárðarson 07.29.2021

Continuation of the eruption at Fagradalsfjall, which was visible that night from Keflavik and Reykjavik.

The activity continues, with variations of the tremor, and lava effusions towards Meradalur, mainly in lava tubes.

 

Sources: Icelandic Media

Fagradajsfjall - 07.28.2021 / 11:50 pm webcam_langihryggur NV

Fagradajsfjall - 07.28.2021 / 11:50 pm webcam_langihryggur NV

Fagradalsfjall - strong thermal anomaly at 07/29/2021 / 3:30 a.m. / Mirova and tremor variations at 07/29/2021 / Hraun.vedur.is - one click to enlargeFagradalsfjall - strong thermal anomaly at 07/29/2021 / 3:30 a.m. / Mirova and tremor variations at 07/29/2021 / Hraun.vedur.is - one click to enlarge

Fagradalsfjall - strong thermal anomaly at 07/29/2021 / 3:30 a.m. / Mirova and tremor variations at 07/29/2021 / Hraun.vedur.is - one click to enlarge

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Publié le par Bernard Duyck
Publié dans : #volcanic activity
 Karymsky - explosive episode of 07.24.2021 - photo G. Volynets / kscnet.ru- IVS - kvert / via K. Bakanov

Karymsky - explosive episode of 07.24.2021 - photo G. Volynets / kscnet.ru- IVS - kvert / via K. Bakanov

Karymsky - Volcanic ash advisory of 07.28.2021 - Doc. VAAC Tokyo

Karymsky - Volcanic ash advisory of 07.28.2021 - Doc. VAAC Tokyo

In Karymsky / Kamchatka, moderate eruptive activity of the volcano continues. According to satellite data from KVERT, an ash emission continues continuously. The explosions send ash up to 1,600 m. a.s.l. and the ash plume extends 52 km east of the volcano.

Moderate eruptive activity of the volcano continues. Ash explosions up to 6 - 7 km altitude could occur at any time. The current activity could affect low-flying aircraft. The aviation code remains orange.

 

Sources: KVERT & VAAC Tokyo

Sinabung - ash plume from 07/28/2021 / 13h20 - photo Firdauss Surbakti  de Umbrella Village District

Sinabung - ash plume from 07/28/2021 / 13h20 - photo Firdauss Surbakti de Umbrella Village District

Sinabung - ash plume from 07/28/2021 / 1:25 p.m. WIB webcam PVMBG Magma Indonesia

Sinabung - ash plume from 07/28/2021 / 1:25 p.m. WIB webcam PVMBG Magma Indonesia

Sinabung - 07.28.2021 / around 1:25 p.m. - photo Magma Indonesia via Rizal

Sinabung - 07.28.2021 / around 1:25 p.m. - photo Magma Indonesia via Rizal

An eruptive episode occurred at Sinabung on July 28, 2021 at 1:20 p.m. WIB / 6:20 a.m. UTC, accompanied by a gray and thick ash plume observed at ± 4,500 m above the summit (± 6960 m above the level of the sea). This eruption was recorded on a seismograph with a maximum amplitude of 120 mm and a duration of 742 seconds.

The VONA went from orange to red on July 28 / 06h34Z.

The Sinabung remains in activity level 3 / siaga, with no-go zones of 3 to 5 km distance depending on the directions.

 

Source: Magma Indonesia

Ili Lewotolok - 07.28.2021 / 12:29 am - webcamPVMBG - Magma Indonesia

Ili Lewotolok - 07.28.2021 / 12:29 am - webcamPVMBG - Magma Indonesia

At Ili Lewotolok, the PVMBG reports for the day of July 27, a plume of color varying from white to black at a height of 80 to 400 meters above the summit.


Seismicity of July 27 is characterized by:
- 5 eruption earthquakes, with an amplitude of 7 to 23 mm and a duration of 17 to 38 seconds.
- 3 blast / emission earthquakes, with an amplitude of 4 to 8 mm and an earthquake duration of 16 to 28 seconds.
- a non-harmonic tremor episode, with an amplitude of 6 mm and an earthquake duration of 71 seconds.
- 2 deep volcanic earthquakes.
In activity level 3 / siaga and aviation code orange, it is recommended that communities around Mount Ili Lewotolok as well as visitors / climbers / tourists not engage in activities within a radius of 3 km from the summit / crater of Mount Ili Lewotolok.

On July 28, an eruptive episode occurred at 00:24 WITA with an ash plume observed at ± 1,000 m above the summit (± 2,423 m above sea level). This eruption was recorded on a seismograph with a maximum amplitude of 45 mm and a duration of 49 seconds.
Another episode followed at 07:22 WITA, accompanied by an ash plume observed at ± 800 m above the summit (± 2,223 m above sea level) recorded on a seismograph with a maximum amplitude of 34 mm and a duration of 29 seconds.

Source: PVMBG, Magma Indonesia

Fagradalsfjall - 27.07.2021 / 06:30 - webcam_langihryggur NV

Fagradalsfjall - 27.07.2021 / 06:30 - webcam_langihryggur NV

Fagradalsfjall - tremor at 07.28.2021 - Doc.Hraun.vedur

Fagradalsfjall - tremor at 07.28.2021 - Doc.Hraun.vedur

At Fagradallsfall, we note the partial collapse of a section of the internal wall of the crater of the active cone on July 27.

The periods of activity alternate with that of calm, as evidenced by the tremor.

Lava flows into Meradalur.

Each day, his surprise ... the volcano decides!

 

Sources: RUV, mbls, Almannavarnir, Visit Reykjanes

Fagradalsfjall - partial collapse of the inner crater wall on 07/27/2021 - video Visit Reykjanes

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