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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
Soufrière de St. Vincent - the new slowly growing dome and fumarole areas - UWI photo / 03.03.2021 / Twitter

Soufrière de St. Vincent - the new slowly growing dome and fumarole areas - UWI photo / 03.03.2021 / Twitter

Satellite observations from March 1 confirmed that the new dome of the Soufrière in St. Vincent continues to grow slowly.


The new seismic station built at the Bamboo Range National Parks Interpretive Center on the east side of the volcano is operational. Data streaming from it to the Seismic Research Center (SRC) began on March 1, 2021.
A new Global Positioning System (GPS) continuous monitoring station has been installed on the recently constructed monument in Fancy.
Work continued at the Belmont Observatory on the installation of the seismic data acquisition system.
Additional measurements of carbon dioxide in the soil along the lower sides of the volcano have been completed.

 

Source: LA SOUFRIÈRE BULLETIN # 38 - 04 MARCH 2021 12h00

Soufrière de St. Vincent - the new slowly growing dome and fumarole areas - UWI photo / 03.03.2021 / Twitter

Soufrière de St. Vincent - the new slowly growing dome and fumarole areas - UWI photo / 03.03.2021 / Twitter

Regional infrasound sensors detected a small explosion from the Veniaminof volcano on February 4, 2021 at 2:13 p.m. UTC (5:13 a.m. local time). Satellite and webcam views indicate low-level ash emissions (<10,000 feet / <3,000 meters asl.) heading in the SSE direction, and minor ash deposits are visible over the volcano.

 

As a result, AVO increases the Aviation Color Code to ORANGE and the Volcano Alert Level to WATCH on Veniaminof Volcano. Local seismic data remains offline due to a failure of a satellite link at Port Heiden. However, the Alaska Volcano Observatory continues to monitor Veniaminof with satellite and webcam data and remote infrasound, seismic and lightning networks.

Eruptive activity usually consists of minor ash emissions, lava fountains and lava flows from the small cone in the summit caldera. Ash emissions are usually confined to the summit crater, but larger events can lead to ash falls in nearby communities and airborne ash.
 

Source: AVO

Veniaminof - 03.04.2021 / 08:42 AKST- low ash plume (to the left of the pylon) - webcam Perryville NW FAA webcam / via AVO

Veniaminof - 03.04.2021 / 08:42 AKST- low ash plume (to the left of the pylon) - webcam Perryville NW FAA webcam / via AVO

Since January 20, 2021, the Pinatubo Volcanoes Network (PVN) has detected a total of 1,722 imperceptible earthquakes under the Pinatubo volcano.

The first group of earthquakes from January 20 to 26, 2021, occurred along the Sacobia lineament at depths of 15 to 28 kilometers and ranged between ML1.0 and ML2.5 in magnitudes.

This was replaced by a more persistent cluster of earthquakes occurring along a north-northwest-south-southeast trending structure 10 to 35 kilometers below the center of the building itself, with some shallower earthquakes occurring at both ends of the cluster. The earthquakes varied between ML0.5 and ML2.8 in magnitude.

All recorded earthquakes are associated with rock fracturing processes. Measurements made at Pinatubo Crater Lake in February 2021 yielded a total CO2 flux of 378 tonnes / day, which is still within the bottom range of 1000 tonnes / day recorded over the past decade. Slight increases in the temperatures of the fumaroles or monitored gas vents have been recorded, but other characteristics such as acidity (pH) remain unchanged.

Nine volcanic earthquakes have been recorded in the past 24 hours.

Given the persistence of seismic activity, DOST-PHIVOLCS raises the status of the Pinatubo volcano from alert level 0 to alert level 1. This means that there are low-level disturbances that may be related to tectonic processes under the volcano and that no imminent eruption is expected.

 

Source: Phivolcs

Mount Pinatubo - the acid lake - 2008 archive photo / Chris Tomong

Mount Pinatubo - the acid lake - 2008 archive photo / Chris Tomong

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

Ninth paroxysm in two weeks at Etna, ... from 00:20 UTC, a resumption of weak strombolian activity at the SEC is observed. A slight increase in the mean amplitude of the volcanic tremor is observed. Infrasound activity also shows an increase in the number of events. The locations of the tremors indicate a movement from the source to the SEC.

Etna - 04.03.2021 / 00h20 UTC - a resumption of weak Strombolian activity is observed at the SEC - INGV OE webcam

Etna - 04.03.2021 / 00h20 UTC - a resumption of weak Strombolian activity is observed at the SEC - INGV OE webcam

From 01:00 UTC, there is an increase in strombolian activity at the SEC, accompanied by the emission of ash which rapidly disperses in the atmosphere towards the NE. At the same time, the Voragine crater also shows lively Strombolian activity with episodic explosions that rise above the level of the crater rim.

Etna- 04.03.2021 / 01h20 - from 01h UTC, an increase in the strombolian activity of the SEC is observed - INGV webcam

Etna- 04.03.2021 / 01h20 - from 01h UTC, an increase in the strombolian activity of the SEC is observed - INGV webcam

According to a now classic step pattern, the Strombolian activity at the SEC gradually increased and to pass at around 02:20 UTC to the stage of  lava fountain. At the same time, there is a further gradual increase in the amplitude of the volcanic tremor, the source of which is located in correspondence with the SEC at nearly 3000 m.

Then from 03:05 UTC, an overflow of lava can be observed from the SEC towards the Valle del Bove.

Etna - lava flow from 03:05 UTC on 04.03.2021 - INGV

Etna - lava flow from 03:05 UTC on 04.03.2021 - INGV

From 02:50 UTC, there is a decrease in the amplitude of the tremor which is at an average level; from 3:15 a.m., there is also a decrease in infrasonic activity, both in the frequency of occurrence and in the amplitude of the signals. At 4:15 a.m., the strombolian activity at the SEC is also significantly reduced while the lava overflow towards the Valle del Bove remains active.

Etna - trémor at 04.03.2021 / 04:10 - Doc. INGV OE

Etna - trémor at 04.03.2021 / 04:10 - Doc. INGV OE

Etna - 04.03.2021 / 06:41 - increase in the tremor from 06:00 UTC - INGV webcam

Etna - 04.03.2021 / 06:41 - increase in the tremor from 06:00 UTC - INGV webcam

The National Institute of Geophysics and Volcanology, Etna Observatory, announces that from around 06:00 UTC, the tremor has started to rise, returning to a high level, while intrasonic activity remains low. The small flow continues to be fed through an open mouth at the eastern base of the CSE which shows spattering activity. The activity also continues at the other summit craters.

 

Source: INGV OE

Pacaya - 03.03.2021 - photo Luis Alejandro Fuentes / via Conred

Pacaya - 03.03.2021 - photo Luis Alejandro Fuentes / via Conred

Pacaya - activity of 03.03.2021 / 08:43 - Doc. W. Chigna / Insivumeh - Conred - Univ. Bristol

Pacaya - activity of 03.03.2021 / 08:43 - Doc. W. Chigna / Insivumeh - Conred - Univ. Bristol

Pacaya - effusion on 03.03.2021 / 10:10 a.m. - W. Chigna / Insivumeh - Conred - Univ. Bristol

Pacaya - effusion on 03.03.2021 / 10:10 a.m. - W. Chigna / Insivumeh - Conred - Univ. Bristol

In Pacaya / Guatemala, the level of volcanic activity is increasing significantly.

Strong Strombolian explosions expel ballistic materials 800 meters above the Mackenney crater (see map of possible ballistic fallout), and develop a plume of ash and gas at 5,500 m. asl.

The dispersion of the ashes is towards the west for more than 170 km. And impacts the communities of El Rodeo, Rl Patrocinio, Los Jazmines, el Cedro, San Francisco de Sales, Calderas y San vincente Pacaya.

The lava flow reaches 400 meters on the southern flank.

 

Sources: Insivumah, Conred, Univ. Bristol

Pacaya - map of possible ballistic fallout as of 03.03.2021 - Doc. Insivumeh

Pacaya - map of possible ballistic fallout as of 03.03.2021 - Doc. Insivumeh

Pacaya from El Pedregal farm, Los Pocitos, Villa Canales on 04.03.2021 - photo Conred

Pacaya from El Pedregal farm, Los Pocitos, Villa Canales on 04.03.2021 - photo Conred

In the Reykjanes Peninsula, a tremor pulse was detected at 2:20 p.m. on March 3, 2021, and was observed at most seismic stations in Iceland. The pulse is located near Litli-Hrutur, halfway between Keilir and Fagradalsfjall.

Similar signals have been observed leading to rashes, but no rash has been confirmed. IMO is working on a more in-depth analysis of the tremor drive.

 Reykjanes peninsula - pulse of trémor on 03.03.2021 / 14h21 - Doc. IMO

Reykjanes peninsula - pulse of trémor on 03.03.2021 / 14h21 - Doc. IMO

An intense earthquake swarm began on the Reykjanes Peninsula on February 24 with an M5.7 and M5.0 earthquake. Since then, two earthquakes on M5.0 have been detected. They occurred on February 27 and March 1. About 18,000 earthquakes have been detected in the region since the start of the activity.

 

About 1,700 earthquakes have been detected since midnight. on March 3, the largest with a magnitude of 4.1 to. 2:12 am, but most of the earthquakes this afternoon are smaller, but the largest tonight at 8:17 pm was 3.8.

At 4:20 p.m., the measurements do not give clear indications on if and when the magma will reach the surface. Experts from the Meteorological Bureau are currently carrying out surveillance flights to see if silt depressions are forming in the area, indicating that the magma is very shallow.

As a precautionary measure for domestic and international air travel, the Reykjanes Peninsula volcanic aviation color code has been raised from yellow (high unrest) to orange (increased unrest). The orange alert represents the third highest level, with red reserved for an imminent or ongoing volcanic eruption.

Reykjanes Peninsula - location and magnitude of earthquakes on 03.03.2021 / 6:20 p.m. - Doc. IMO
Reykjanes Peninsula - location and magnitude of earthquakes on 03.03.2021 / 6:20 p.m. - Doc. IMO
Reykjanes Peninsula - location and magnitude of earthquakes on 03.03.2021 / 6:20 p.m. - Doc. IMO

Reykjanes Peninsula - location and magnitude of earthquakes on 03.03.2021 / 6:20 p.m. - Doc. IMO

Today March 4 at 12:59 am, an M4.1 earthquake was detected 1.4 km SE of Fagradalsfjall. Most of the activity since midnight has taken place near Fagradalsfjall and has drifted somewhat southwest compared to yesterday. Earthquake and earthquake activity decreased a bit overnight, but increased again around 5 am. 15-20 earthquakes above M3.0 have been detected since midnight.

Reykjanes Peninsula - area of ​​possible lava flow extension from a 2 km fissure. in length near Fagradalsfjall - Doc. IMO 03.03.2021

Reykjanes Peninsula - area of ​​possible lava flow extension from a 2 km fissure. in length near Fagradalsfjall - Doc. IMO 03.03.2021

Reykjanes - The location of a potential eruption on the Reykjanes Peninsula is in an uninhabited area, but the SO2 emitted could cause problems in neighboring towns and villages - IMO Map

Reykjanes - The location of a potential eruption on the Reykjanes Peninsula is in an uninhabited area, but the SO2 emitted could cause problems in neighboring towns and villages - IMO Map

As the area is uninhabited, potential volcanic eruptions are unlikely to threaten the settlements; Kelir's area was cordoned off, however. On the other hand, if there is an eruption, sulfur dioxide could impact populations both on the Rekjanes Peninsula and in Reykjavik.

 

Sources: IMO, ISOR & mbls

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Publié le par Bernard Duyck
Publié dans : #volcanic activity

The 8th paroxysm of Etna, this March 2, 2021, was largely masked by atmospheric conditions, only the top of the plume being observed.

Etna - strombolian activity at the SEC - 02.03.2021 / 10h54 - EMOT / INGV OE webcam

Etna - strombolian activity at the SEC - 02.03.2021 / 10h54 - EMOT / INGV OE webcam

From 10:45 UTC, there is a slight increase in the mean amplitude of the volcanic tremor, and the resumption of weak Strombolian activity at the southeast crater / SEC. Infrasound activity also shows an increase in the number of events.
From 11:34 GMT, Strombolian activity in the SEC increases, accompanied by the emission of ash which quickly disperse into the atmosphere. After a short stationary phase, the average amplitude of the volcanic tremor, around 11:30 GMT, started to increase again, the sources moving towards the south-eastern crater.

Etna SEC - lava fountains on 03/02/2021, at 1:18 p.m., 1:24 p.m. and 1:51 p.m. respectively - EMOT / INGV OE webcam - one click to enlargeEtna SEC - lava fountains on 03/02/2021, at 1:18 p.m., 1:24 p.m. and 1:51 p.m. respectively - EMOT / INGV OE webcam - one click to enlarge
Etna SEC - lava fountains on 03/02/2021, at 1:18 p.m., 1:24 p.m. and 1:51 p.m. respectively - EMOT / INGV OE webcam - one click to enlarge

Etna SEC - lava fountains on 03/02/2021, at 1:18 p.m., 1:24 p.m. and 1:51 p.m. respectively - EMOT / INGV OE webcam - one click to enlarge

From 12:24 GMT, a rapid increase in the amplitude of the volcanic tremor is observed, whose source is located at the southeast crater at about 3000 m. Infrasound activity is also supported both in the rate of occurrence and in the energy of events.

The strombolian activity of the south-eastern crater has turned into a lava fountain. Due to the cloud cover, it is not possible to make continuous observations.

The INGV OE announces that the activity of lava fountains at the SEC has ceased at 14:50 GMT. From 14:40 UTC, there was a rapid decrease in the average amplitude of the volcanic tremor which reached average values ​​at 15:00 UTC.

Etna - 03.02.2121 / 2:50 p.m. - EMOT / INGV OE webcam

Etna - 03.02.2121 / 2:50 p.m. - EMOT / INGV OE webcam

Etna - fluctuations in the tremor at 02.03.2021 / 2.10 p.m. the plot relating to the 8th paroxysmal episode on the right - Doc. INGV OE

Etna - fluctuations in the tremor at 02.03.2021 / 2.10 p.m. the plot relating to the 8th paroxysmal episode on the right - Doc. INGV OE

2021.03.02 - Etna - Emission of sulfur dioxide, with 14.90DU of SO2. - Sentinel- 5P Tropomi / DLR / BIRA / ESA

2021.03.02 - Etna - Emission of sulfur dioxide, with 14.90DU of SO2. - Sentinel- 5P Tropomi / DLR / BIRA / ESA

At 15:06 UTC, an ash fall was reported in the southern sector of the volcano. In particular in the areas of: San Gregorio (motorway exit); Trecastagni; Aci S. Antonio; Pedara and Catania.

 

Source: INGV OE

Klyuchevskoy - the cinder cone G.S. Gorshkov on 03.02.2021 - photo D. Melnikov via olga Girina

Klyuchevskoy - the cinder cone G.S. Gorshkov on 03.02.2021 - photo D. Melnikov via olga Girina

At Klyuchevskoy, the ash cone and the lava flow of the lateral rupture on the western flank remain active on March 2, 2021, marked by a thermal anomaly. The lateral rupture is named after Corr.- Member USSR Academy of Sciences G.S. Gorshkov.

A moderate emission of gas and vapor continues at the top of the volcano.

 

Source: Olga Girina / Photo by Dmitry Melnikov & KVERT

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

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

In February 2021, the OVPF recorded in the Piton de la Fournaise massif in total:

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

- 1 deep earthquake (below sea level);

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

 

The GPS in the summit area and in the far field did not record any particular signals, with the exception of the GPNG and GPSG stations located in the Grandes Pentes area. The GPNG and GPSG stations continued to record subsidence and eastward movement, although their movement slowed.

Since the last eruption, a continuous increase in CO2 emissions from the soil has been recorded at the level of the distal sites (Plaine des Cafres and Plaine des Palmistes sectors, but also proximal (Gîte du volcano).

 

Source: OVPF

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Publié le par Bernard Duyck
Publié dans : #volcanic activity, #Sismologia
 Sinabung - ash plume and pyroclastic flows on 03.02.2021 - photo Komunitas Beidar Sinabung - one click to enlarge

Sinabung - ash plume and pyroclastic flows on 03.02.2021 - photo Komunitas Beidar Sinabung - one click to enlarge

In Sinabung, in the province of Karo on Sumatra, from 6:42 a.m. to 8:20 a.m. WIB on March 2, 2021, there were 13 pyroclastic avalanche flows, with a sliding distance of 2,000 to 5,000 meters to the southeast, and the height of the ash column is more than 5,000 meters, the wind is weak to the west - southwest. Warm clouds reach the Lauborus River in the east-southeast sector.

The aviation code is red, before being reduced to orange.

Sinabung - 03.02.2021 - ash fall on the surrounding villages - photos Gung Pinto News & Beidar Sinabung - one click to enlarge
Sinabung - 03.02.2021 - ash fall on the surrounding villages - photos Gung Pinto News & Beidar Sinabung - one click to enlargeSinabung - 03.02.2021 - ash fall on the surrounding villages - photos Gung Pinto News & Beidar Sinabung - one click to enlarge

Sinabung - 03.02.2021 - ash fall on the surrounding villages - photos Gung Pinto News & Beidar Sinabung - one click to enlarge

Ash falls are found in various villages, with a thickness of 3 cm.

The Himawari-8 satellite picked up an ash cloud drifting west.

Ash falls are found in various villages, with a thickness of 3 cm.  The Himawari-8 satellite picked up an ash cloud drifting west.

Ash falls are found in various villages, with a thickness of 3 cm. The Himawari-8 satellite picked up an ash cloud drifting west.

Sumatra - Sinabung ash cloud seen by Himawari-8 on 02.03.2021 / 11h WIB - Doc. BMKG

Sumatra - Sinabung ash cloud seen by Himawari-8 on 02.03.2021 / 11h WIB - Doc. BMKG

Sinabung - plume and co-pyroclastic cloud 02.03.2021  - ANTARA FOTO  /Sastrawan Ginting

Sinabung - plume and co-pyroclastic cloud 02.03.2021 - ANTARA FOTO /Sastrawan Ginting

The seismicity of March 2 between 00 and 6 a.m. is characterized by:

- 1 eruption earthquake, with an amplitude of 40 mm, and the duration of the earthquake was 191 seconds.
- 13 earthquakes linked to pyroclastic flows, with an amplitude of 120 mm and an earthquake duration of 143-485 seconds.
- 35 collapse / avalanche earthquakes, with an amplitude of 10 to 65 mm and a duration of 22 to 160 seconds of the earthquake.
- 23 low frequency earthquakes, with an amplitude of 5 to 25 mm and the duration of the earthquake was 10 to 40 seconds.
- 1 remote tectonic earthquake
- 1 episode of continuous tremor with an amplitude of 2-5 mm, dominating 3 mm.

 

The activity level remains at 3 / siaga with prohibitions of 3 to 5 km. depending on the flanks concerned
 

Sources: PVMBG, Magma Indonesia, Beidar Sinabung, Nachelle Homestay, and local news agencies

THE PACAYA VOLCANO. The volcano prevention unit -UPV-, the strategic intervention team -EIE-, the immediate intervention team -ERI- and the CONRED I region, are deployed at different strategic points to check the conditions and coordinate actions with the hierarchical system of coordinators.

THE PACAYA VOLCANO. The volcano prevention unit -UPV-, the strategic intervention team -EIE-, the immediate intervention team -ERI- and the CONRED I region, are deployed at different strategic points to check the conditions and coordinate actions with the hierarchical system of coordinators.

In the early hours of March 1, 2021, Insivumeh recorded a notable increase in the internal seismic activity of the Pacaya, corresponding to an increase in Strombolian activity.

 

Pacaya - increased RSAM - Insivumeh

 

According to observers of the observatory, explosions expel ballistic materials to a height of up to 500 meters above the crater; this activity is accompanied by a plume of ash and gas at 3,500 m. asl., moving west and southwest.

Ash falls are observed in El Patrocinio, with possibilities in Los Rios, Los Jazmines El Rodeo, San José, and the municipalities in the same direction.

To be continued

 

Source: Insivumeh

Sabancaya- activity from 22 to 28.02.2021 - Doc. I.G. Peru

Sabancaya- activity from 22 to 28.02.2021 - Doc. I.G. Peru

The eruptive activity of Sabancaya between February 22 and 28 remains at moderate levels, with an average of 91 daily explosions, and the observation of plumes of ash and gas up to 2,000 meters above the summit.

During this period, I.G. Peru recorded 1977 earthquakes of volcanic origin, associated with the circulation of internal fluids. VT earthquakes, of magnitude between 1.9 and 2.8, occur mainly north of the volcano.

The deformations do not present any significant anomalies, except for slight inflation in the north. The satellites did not identify any thermal anomaly.

 

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

 

Source: I.G.P.

Reykjanes peninsula - surroundings of Fagradalsfjall - Doc. Skjáskot Iceland 360 VR via mbls

Reykjanes peninsula - surroundings of Fagradalsfjall - Doc. Skjáskot Iceland 360 VR via mbls

New data provides reason to take a closer look at the magma intrusion scenario beneath the Fagradalsfjall area on the Reykjanes Peninsula.

Mount Fagradalsfjall, the westernmost part of the Reykjanes Peninsula's mountain ridge, is actually a small plateau. Some hyalocaslite ridges protrude, especially in the western part. Its highest altitude is 385 m. above sea level.

Reykjanes Peninsula - Fagradalsfjall - wrapped icelandic InSAR 23 feb. to1 ° Tue. - Doc.IMO

Reykjanes Peninsula - Fagradalsfjall - wrapped icelandic InSAR 23 feb. to1 ° Tue. - Doc.IMO

I reproduce the IMO update from 03/01/2020 at 6:15 p.m.:

“The Scientific Council for Civil Protection met in a teleconference today to discuss the earthquake on the Reykjanes Peninsula. The meeting was attended by representatives of the Icelandic Meteorological Office, University of Iceland, Environment Agency, Isavia-ANS, HS-Orka and ÍSOR.

It was stated at the meeting that the Meteorological Bureau's automatic seismic system has measured around 1,800 earthquakes since midnight and that they are mostly confined to the SW area of ​​Keilir and Trölladyngja. Of those 1,800, 23 earthquakes of magnitude 3 or greater and about 3 earthquakes are of magnitude 4 or greater. The largest of midnight was measured at 4:35 p.m., with a size of 5.1 and it came from about 1 km ASA through Keilir.

The Scientific Council also reviewed the satellite images (InSAR) received today. Excerpts from these images show more entries than has been previously seen in the region in recent days. The most likely explanation is that magma is forming under the area where the greatest seismic activity has taken place in recent days. These new data will be better processed, for example by means of a model, in order to better inform the course of events.

In light of this new data which was discussed at a Scientific Council meeting today and which has been reviewed by experts, it is important to take a closer look at the magma intrusion scenario beneath the area. by Fagradalsfjall.
 

The possible scenarios are:

1. Seismic activity will decrease in the coming days or weeks.
2. The eruption will increase with larger earthquakes, up to magnitude 6 near Fagradalsfjall
3.An earthquake with a magnitude of up to 6.5 will have its source in the Sulfur Mountains.
4. Magma intrusions continue near Fagradalsfjall with either:
- The magma intrusion activity decreases and the magma solidifies
- they lead to a lava flow which will probably not threaten the colonies.


Current activity on the Reykjanes Peninsula is divided into chapters and it is difficult to predict the exact development and whether one scenario is more likely than another. New data is expected later this week that could further shed light on the reasons for this crash. The Scientific Council will meet again tomorrow to make a new assessment of the available data as well as to assess new measures. "

 

Sources: IMO & mbls

Reykjanes peninsula - location and magnitude of the seisms - Doc. IMO at 02.03.2021 / 08h35
Reykjanes peninsula - location and magnitude of the seisms - Doc. IMO at 02.03.2021 / 08h35
Reykjanes peninsula - location and magnitude of the seisms - Doc. IMO at 02.03.2021 / 08h35

Reykjanes peninsula - location and magnitude of the seisms - Doc. IMO at 02.03.2021 / 08h35

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Publié le par Bernard Duyck
Publié dans : #volcanic activity

After a small calm of a few days, Strombolian activity resumed at the southeast crater of Etna on February 28 at around 7.45 am local time, with a sudden increase in the tremor.

The images taken by the thermal cameras of Monte Cagliato (east side of Etna) and Montagnola (high southern slope) show the speed with which the phenomena developed, from the first small explosions to the sustained lava fountains, with the creation of a subplinal eruptive column.

Etna "on pause" this 02/26/2021 / 09:50 - image Sentinel 2 bands 4,3,2 + bands 12,11,8A via Mounts project

Etna "on pause" this 02/26/2021 / 09:50 - image Sentinel 2 bands 4,3,2 + bands 12,11,8A via Mounts project

Etna SEC - activity of 02.28.2021 / 07h48 - INGV OE webcams - one click to enlargeEtna SEC - activity of 02.28.2021 / 07h48 - INGV OE webcams - one click to enlarge

Etna SEC - activity of 02.28.2021 / 07h48 - INGV OE webcams - one click to enlarge

Etna - paroxysmof 02/28/2021- INGV OE

Etna SEC - subplinal eruptive column - photo kindly shared by © Pippo Scarpinati

Etna SEC - subplinal eruptive column - photo kindly shared by © Pippo Scarpinati

Strombolian activity, characterized by a continuous jet, was mainly concentrated in two vents and reached an initial height of about 300 m. An overflow feeds a lava flow towards the Valle del Bove.

At 10:20 a.m. local time, a sudden decrease in tremor to medium-low values ​​was observed. The source of the quake remains in the area of ​​the SE crater at a depth of about 2,600 m above sea level.

At 10:33 a.m. local time, the SEC fountain stopped almost suddenly, while the lava flow to the Valle del Bove remained active.

Etna - the impressive plume of the 7th paroxysm at 09:50 UTC, or 1:30 after the start of the broadcast; the overflow and the lava flow are also visible - image Sentinel2 28,02,2021 / via Copernicus / Directorate-General for Defense Industry and Space l DG DEFIS - one click to enlarge

Etna - the impressive plume of the 7th paroxysm at 09:50 UTC, or 1:30 after the start of the broadcast; the overflow and the lava flow are also visible - image Sentinel2 28,02,2021 / via Copernicus / Directorate-General for Defense Industry and Space l DG DEFIS - one click to enlarge

Etna - sulfur dioxide anomaly on 28,02,2021, with 149.02DU of SO2 at an altitude of ~ 11km. Estimated mass within 300 km of 15.1ktons. - Doc. Tropomi / DLR-BIRA-ESA

Etna - sulfur dioxide anomaly on 28,02,2021, with 149.02DU of SO2 at an altitude of ~ 11km. Estimated mass within 300 km of 15.1ktons. - Doc. Tropomi / DLR-BIRA-ESA

Etna - amplitude of the tremor at 02/28/2021 / 10:10 a.m. - Doc. INGV OE

Etna - amplitude of the tremor at 02/28/2021 / 10:10 a.m. - Doc. INGV OE

A resumption of Strombolian activity in the SEC, accompanied by the emission of ash is observed from 11:20 a.m., with a further increase in the average amplitude of the volcanic tremor ... to drop around 12 p.m.

The source of the tremor is still located in the area of ​​the SE crater, at a depth of about 2500 m above sea level, while showing a gradual slide towards the other summit craters, during the last hours.

 

Source: INGV & Boris Behncke

Etna - the flow and the projections cool, while the other craters degassing - webcam INGV Emot0327 on 02.28.2021 / 4:10 p.m.

Etna - the flow and the projections cool, while the other craters degassing - webcam INGV Emot0327 on 02.28.2021 / 4:10 p.m.

Analysis of Stromboli camera footage revealed explosive footage in the North Zone, which began with three events of lesser intensity at 1:32:50, 1:33:00 and 1:33:10 UTC, respectively.

After approximately ten seconds, a major explosion occurred at 1:33:30 UTC lasting approximately 10 seconds and ended at 1:34:00 UTC.
This latter activity produced a fall of coarse material along the Sciara del Fuoco and part of the material fell in the direction of Pizzo.

 

From the seismic point of view, after the phase of increasing the amplitude of the tremor, which followed the explosive sequence, the values ​​returned to the standard around 01:37 UTC approximately. No significant change is observed in the frequency of occurrence of explosive events.
The strain data does not show significant changes.

 

Source: INGV

Stromboli - 01.03.2021 / 01h33 - webcam therm. INGV OE

Stromboli - 01.03.2021 / 01h33 - webcam therm. INGV OE

The Pacaya maintains weak to moderate explosions on February 28, characterized by sporadic expulsions of incandescent material 150 meters above Mackenney crater, and an ash plume dispersing westward, with fallout reported to Patrocinio.

Its effusive activity feeds a lava flow towards the SSO, of 1,750 meters long.

Insivumeh recalls the ban on access to the Mackenney and the flow areas, due to their instability, their high temperature and the gases emanating from them.

 

Source: Insivumeh

Volcan De Pacaya - Finca El Caracol neighbors share this beautiful photo of the lava flow during the night of February 27-28 - Doc. DisastersGT

Volcan De Pacaya - Finca El Caracol neighbors share this beautiful photo of the lava flow during the night of February 27-28 - Doc. DisastersGT

In Klyuchevskoy, the fissure eruption on the northwest flank, which began late in the day on February 17, continues with the formation of a cinder cone.

In the first days of the eruption, a lot of pyroclasts were expelled by the gases and its growth was rapid.

Then with the arrival of a magma less saturated with gas, the eruption passed to a more effusive phase, slowing down the growth of the cone; it begins to collapse in the lava flow which emanates from it.

 

Source: Сергей Самойленко

Klyuchevskoy- the growing cinder cone on the active crack of the NW flank - photo Сергей Самойленко / 02.28.2021

Klyuchevskoy- the growing cinder cone on the active crack of the NW flank - photo Сергей Самойленко / 02.28.2021

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Publié dans : #volcanic activity

A moderate eruptive activity continues at Ebeko, with this February 27 an explosion accompanied by an ash plume at more than 2,500 meters asl, then drifting 3 km to the southwest of the volcano

The aviation code remains orange, with other explosions potentially affecting low-altitude flights and Severo-Kurilsk airport.

 

Sources: KVERT, VAAC Tokyo and Toppress

Ebeko - gas plume and ash - photo Toppress 02.27.2021

Ebeko - gas plume and ash - photo Toppress 02.27.2021

The VAAC Darwin issued an orange VONA on February 28 for the Sinabung, following a discreet emission of ash up to an altitude of flight 110, with extension to the southwest.

The seismicity of February 27 is characterized by:

- 29 collapse / avalanche earthquakes, with an amplitude of 3 to 120 mm and a duration of 35 to 161 seconds of the earthquake.
- 3 blast earthquakes, with an amplitude of 13 to 16 mm and the earthquake lasted 15 to 45 seconds.
- 189 low frequency earthquakes with an amplitude of 3 to 10 mm and the duration of the earthquake was 6 to 30 seconds.
- A distant tectonic earthquake.

The activity level remains at 3 / siaga.

 

Sources: VAAC Darwin, Nachelle homestay

Sinabung - 02/28/2021 / 6:53 am - photo Nachelle homestay

Sinabung - 02/28/2021 / 6:53 am - photo Nachelle homestay

The Sakurajima experienced this February 28 at 10 a.m. JST an explosion, accompanied by a plume rising to 1,500 m. above the Minamidake crater, with dispersion towards the northwest.

The JMA reports that large volcanic bombs were scattered between 800 and 1,000 m. from the crater.

 

Source: JMA

February 28, 2021, ~ Explosion ~ 桜島 Sakurajima Volcano, Japan ~ 10:00 JST

In Kilauea, lava from the West Vent continues to feed the lava lake in Halema'uma'u Crater.

The active western half of the lava lake measured approximately 217 m. depth, measured by a remote laser rangefinder on the morning of February 27, 2021.

Observations yesterday afternoon indicated that lava effusion continues at the western fissure. The lava quickly develops a thin crust as it flows outward to the east with occasionally a crust sinking between the vent and the main island, but not beyond the island.

Stagnant (solidified) lake crust covers the eastern half of the lake and slowly grows west around the main island. The position and dimensions of the main island and the smaller islands have not changed due to the solidified crust. Some minor scree debris collects on the lava surface around one or two of the islands as their edges cool, crack and begin to crumble.
 

Source: HVO

Kilauea / Halema'uma'u crater - map of summit eruptive activity - Doc. HVO-USGS

Kilauea / Halema'uma'u crater - map of summit eruptive activity - Doc. HVO-USGS

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  Sinabung - 25.02.2021 / 10:08 WIB - photo Rizal

 Sinabung - 25.02.2021 / 10:08 WIB - photo Rizal

Sinabung - seismicity at 02.26.2021 - note a gradual increase over the past month - Doc. Magma Indonesia

Sinabung - seismicity at 02.26.2021 - note a gradual increase over the past month - Doc. Magma Indonesia

Sinabung's main crater emits a thin, white plume about 50-200 meters from the summit.

The seismicity of February 26 is broken down into:

- 111 collapse / avalanche earthquakes, with an amplitude of 2 to 120 mm and an earthquake duration of 25 to 250 seconds.
- 31 emission earthquakes, with an amplitude of 3 to 27 mm and the earthquake lasted 12 to 110 seconds.
- 373 low frequency earthquakes, with an amplitude of 2 to 11 mm, and the duration of the earthquake was 5 to 26 seconds.
- a local tectonic earthquake.

 

The activity level remains at 3 / siaga /
Communities and visitors / tourists not to conduct activities in the villages that have been displaced, as well as the location within a radial radius of 3 km from the summit of G. Sinabung, as well as within a sector radius of 5 km for the south-eastern sector, and 4 km for the east-north sector.

 

Sources: PVMBG, Magma Indonesia 

Taal - everything seems calm on 02.26.2021 - photo Phivolcs

Taal - everything seems calm on 02.26.2021 - photo Phivolcs

During the last 24 hours, the Taal volcanic monitoring network recorded twenty-eight (28) volcanic earthquakes and one hundred and thirty (130) episodes of volcanic tremor lasting from one (1) to five (5) minutes. . Despite this, only weak steam-laden plumes were emitted by fumarole activity at the vents of the main crater. Elevated temperatures of 74.6 ° C and a pH of 1.59 were last measured from the main crater lake on February 18 and 12, 2021, respectively. The ground deformation parameters of the continuous electronic tilt on the volcano island have recorded slight deflation around the main crater since October 2020, but overall, very slow and steady inflation of the Taal region was recorded by continuous GPS data after the eruption.

Alert level 1 (abnormal) is maintained on the Taal volcano. DOST-PHIVOLCS reminds the public that at Alert Level 1, sudden steam or phreatic explosions, volcanic earthquakes, minor ash falls and fatal accumulations or expulsions of volcanic gas can occur and threaten areas of the volcanic island of Taal (TVI). DOST-PHIVOLCS strongly recommends that entry into TVI, the Taal Permanent Danger Zone or PDZ, especially around the main crater and Daang Kastila fissure, remain strictly prohibited.
 

Source: Phivolcs

Reykjanes Peninsula - location and magnitude of earthquakes as of 02/27/2021 / 7:10 am - Doc. IMO
Reykjanes Peninsula - location and magnitude of earthquakes as of 02/27/2021 / 7:10 am - Doc. IMO
Reykjanes Peninsula - location and magnitude of earthquakes as of 02/27/2021 / 7:10 am - Doc. IMO

Reykjanes Peninsula - location and magnitude of earthquakes as of 02/27/2021 / 7:10 am - Doc. IMO

An intense earthquake swarm began on the Reykjanes Peninsula at 10 a.m. on February 24 with an M5.7 earthquake followed by an M5.0 Earthquakes were widely felt in the southwestern part of the country, in the north-west of Iceland to Ísafjörður.

About twenty earthquakes of M4 and more have been recorded and more than 100 on M3. Earthquake rate decreased on February 25

Since noon on the 26th it started to increase again and several earthquakes above M4 were recorded. The largest earthquake on February 26 was M4.9 at 10:38 p.m. This was widely felt in the SW eg. in Vestmanneyjar, Borgarfjörður, Rangárþing. Three earthquakes on M3.0 were detected around 2:30 a.m. The largest was M3.8 and was felt in the southwest and west of Iceland.

Such intense swarms are not unheard of eg. on June 10, 1933, five earthquakes M4.9-M5.9 were recorded at Fagradalsfjall.

The swarm is still ongoing and since February 23, the SIL system has detected more than 6,000 earthquakes in the region.
 

Source: IMO

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Merapi - pyroclastic flow detaching under the cloud cover on 02.25.2021 / 4:55 p.m. - photo PVMBG

Merapi - pyroclastic flow detaching under the cloud cover on 02.25.2021 / 4:55 p.m. - photo PVMBG

In Merapi, in activity level 3 / siaga, the seismicity is characterized on February 25 by:

- Two earthquakes related to pyroclastic flows, respectively at 16:52 WIB and 18:42 WIB, with an amplitude of 37 and 51 mm and an earthquake duration of 115 and 175 seconds. They moved for 1500 m and 1900 m in a south-westerly direction.


- 198 collapse earthquakes, with an amplitude of 3-58 mm and a length of 9-188 seconds of the earthquake.
- 2 emission earthquakes, with an amplitude of 8 to 13 mm and the earthquake lasted 11 to 14 seconds.
- 1 hybrid / multiphase earthquake.

The precautions to be taken and the prohibited areas remain unchanged

 

Source: BPPTKG

Merapi - seismicity of the last week on 25.02.2021 - Doc.BPPTKG

Merapi - seismicity of the last week on 25.02.2021 - Doc.BPPTKG

During the last 24 hours, the Taal volcano network has recorded one hundred and thirteen (113) episodes of volcanic tremor lasting from one to thirty-four minutes.

Despite this, only weak steam-laden plumes were emitted by fumarole activity at the vents of the main crater. Elevated temperatures of 74.6 ° C and a pH of 1.59 were last measured from the main crater lake on February 18 and 12, 2021, respectively. The ground deformation parameters of the continuous electronic tilt on the island of the volcano have recorded slight deflation around the main crater since October 2020 but overall, very slow and steady inflation of the Taal region was recorded by continuous GPS data after the eruption.

Alert level 1 (abnormal) is maintained on the Taal volcano. DOST-PHIVOLCS reminds the public that at Alert Level 1, sudden steam or phreatic explosions, volcanic earthquakes, minor ash falls and fatal accumulations or expulsions of volcanic gas can occur and threaten areas of the volcanic island of Taal (TVI). DOST-PHIVOLCS strongly recommends that entry into TVI, the permanent danger zone of Taal or PDZ, especially around the main crater and Daang Kastila fissure, remain strictly prohibited.

 

Source: Phivolcs

Taal - fumaroles on voolcanic island - photo archives Philstar / Ed Jones

Taal - fumaroles on voolcanic island - photo archives Philstar / Ed Jones

The Pacaya presents an essentially effusive activity on February 25, with the lengthening of the lava flow on the southern flank between 1000 and 1680 m.

Moderate to strong strombolian explosive activity is recorded sporadically.

Degassing columns, white to azure, 200 to 800 m high. above the crater are observed, moving south and over-west

 

Source: Insivumeh

Pacaya - lava flow of 02.24.2021 - Insivumeh photos

Pacaya - lava flow of 02.24.2021 - Insivumeh photos

The seismic swarm continues in the Reykjanes Peninsula.

On February 24, two earthquakes above M5.0 were detected. One at 10:05 am from M5.7 and M5.0 at 10:30 am. At 12:37 a.m., an M4.8 earthquake was detected near Kleifarvatn. IMO's SIL system detected 11 earthquakes on M4.0 and much larger than M3.0. The earthquakes were felt throughout the SV part of Iceland, north of Húnaþing and west of Ísafjörður. Please note that the seismic activity is located on the Reykjanes Peninsula. Other major earthquake locations are unreliable.

Yesterday at 14:35, an earthquake of M3.5 was detected near Fagradalsfjall and another at 14:21 of M3.2. The earthquakes were felt in Reykjanes and the capital region. The swarm is still ongoing and since February 24, the SIL system has detected more than 4,200 earthquakes in the region.

 

Source: IMO

Reykjanes Peninsula - location and magnitude of earthquakes on 02.25.2021 at 3.15 p.m. - Doc. IMO
Reykjanes Peninsula - location and magnitude of earthquakes on 02.25.2021 at 3.15 p.m. - Doc. IMO
Reykjanes Peninsula - location and magnitude of earthquakes on 02.25.2021 at 3.15 p.m. - Doc. IMO

Reykjanes Peninsula - location and magnitude of earthquakes on 02.25.2021 at 3.15 p.m. - Doc. IMO

Reykjanes Peninsula - location and magnitude of earthquakes on 02/26/2021 at 7:00 a.m. - Doc. IMO
Reykjanes Peninsula - location and magnitude of earthquakes on 02/26/2021 at 7:00 a.m. - Doc. IMO

Reykjanes Peninsula - location and magnitude of earthquakes on 02/26/2021 at 7:00 a.m. - Doc. IMO

InSAR image of the strong current earthquake sequence near Reykjavík. About 30 km of the boundary of the ENE trending plate has moved laterally to the left at depth with several right lateral strike-slip surface failures Coseismic N-S, including that of the magnitude 5.7 earthquake - Doc. Sigurjón Jónsson - Processed by Adriano Nobile, CDI group, KAUST

InSAR image of the strong current earthquake sequence near Reykjavík. About 30 km of the boundary of the ENE trending plate has moved laterally to the left at depth with several right lateral strike-slip surface failures Coseismic N-S, including that of the magnitude 5.7 earthquake - Doc. Sigurjón Jónsson - Processed by Adriano Nobile, CDI group, KAUST

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At 6 p.m. local time there is an increase in the intensity and frequency of Strombolian activity at the southeastern crater of Etna, this activity involves two mouths located in the easternmost part of the southeast crater. A weak ash emission persists.
The phase of increase in the amplitude of the volcanic tremor continues, showing medium-high values ​​... on the way to the 6 ° paroxysm 2021. The sources are located under the south-eastern crater at a depth of about 2500 m above sea level.
Infrasound activity is also increasing and the sources of the events are located in the southeast crater.

Etna SEC - 02.24.2021 / 5:46 p.m. - webcam Emov0355 / INGV OE

Etna SEC - 02.24.2021 / 5:46 p.m. - webcam Emov0355 / INGV OE

The National Institute of Geophysics and Volcanology, Etnéo Observatory, announces that from 7 p.m. local, an increase in Strombolian activity is recorded at the CSE.

In particular, the two mouths where Strombolian activity was concentrated now produce a lava fountain, the height reached by this activity is about 400 m.

The ash emission activity into the atmosphere continues above the SEC.

From the surveillance cameras from 8:30 p.m. a lava overflow from the CSE towards Valle del Bove is observed.

Etna SEC - 02.24.2021 - lava fountain at 7:39 pm / INGV OE webcam and at 7:58 pm / LAVE webcam - one click to enlargeEtna SEC - 02.24.2021 - lava fountain at 7:39 pm / INGV OE webcam and at 7:58 pm / LAVE webcam - one click to enlarge

Etna SEC - 02.24.2021 - lava fountain at 7:39 pm / INGV OE webcam and at 7:58 pm / LAVE webcam - one click to enlarge

Etna SEC - Fontaine de lave le 24.02.2021 / 21h18 - webcam INGV OE

Etna SEC - Fontaine de lave le 24.02.2021 / 21h18 - webcam INGV OE

Etna SEC - 02.24.2021 / 22:28 - overflow and flow in the Valle del Bove - LAVE webcam

Etna SEC - 02.24.2021 / 22:28 - overflow and flow in the Valle del Bove - LAVE webcam

At 22:00 local time, the lava fountain reached the height of about 500 m from the edge of the crater, the eruptive column expands vertically for several kilometers.
A well-fed lava overflow is in progress in the southwestern sector of the CSE. The stream flowing in Valle del Bove is always fed.
The average amplitude of the volcanic tremor shows high values ​​with a tendency to increase further. The source location remains within the CSE area at a depth of approximately 2800 m above sea level. Infrasound activity is also high in both the rate of occurrence and the energy of the events. . The localization of infrasound events remains with the SEC.

Etna SEC - extract from video / local team via S. Harangi - one click to enlarge
Etna SEC - extract from video / local team via S. Harangi - one click to enlargeEtna SEC - extract from video / local team via S. Harangi - one click to enlarge

Etna SEC - extract from video / local team via S. Harangi - one click to enlarge

Etna SEC - control of parameters by INGV teams - tremor fluctuations / INGV OE and thermal anomalies / Mirova - one click to enlarge
Etna SEC - control of parameters by INGV teams - tremor fluctuations / INGV OE and thermal anomalies / Mirova - one click to enlargeEtna SEC - control of parameters by INGV teams - tremor fluctuations / INGV OE and thermal anomalies / Mirova - one click to enlarge

Etna SEC - control of parameters by INGV teams - tremor fluctuations / INGV OE and thermal anomalies / Mirova - one click to enlarge

In its 23:35 report, the INGV indicates that the activity of the lava fountains at the SEC has ceased, the lava flows remain active in the southwest sector and in the east zone.
As for the average amplitude of the volcanic tremor, after a phase of increase to very high values, at 21:20 UTC, it showed a sharp drop reaching the average level, where it is still found. The source of the quake is located in the SEC area at a depth of about 2900 m above sea level. At the same time, the infrasound activity also suffered a sharp break.
decrease in both the rate of occurrence and the energy of events, which are localized to the SEC.

 

Source: INGV OE

 Sinabung - 25.02.2021 / 10:08 WIB - photo Rizal

Sinabung - 25.02.2021 / 10:08 WIB - photo Rizal

Sinabung - explosion of 02.25.2021 / 10:10 a.m. - photo Beidar Sinabung

Sinabung - explosion of 02.25.2021 / 10:10 a.m. - photo Beidar Sinabung

Mount Sinabung erupted on Thursday, February 25, 2021 at 10:08 a.m. WIB with an ash column observed ± 1,500 m above the summit (± 3,960 m above sea level). The ash column was gray, with moderate to thick intensity, to the east and southeast. This eruption was recorded on a seismograph with a maximum amplitude of 66 mm and a duration of 191 seconds.

In addition were observed:
- 44 collapse / avalanche earthquakes, with an amplitude of 2-90 mm and the earthquake lasted 35-150 seconds.
- 2 blast earthquakes
- 39 low frequency earthquakes
- 3 hybrid / multiphase earthquakes
- 1 deep volcanic earthquake.

Activity settings remain unchanged

 

Sources: Magma Indonesia & Beidar Sinabung

Reykjanes peninsula - seismic swarm of 02.24.2021 at 10.50 a.m. - Doc. IMO
Reykjanes peninsula - seismic swarm of 02.24.2021 at 10.50 a.m. - Doc. IMO
Reykjanes peninsula - seismic swarm of 02.24.2021 at 10.50 a.m. - Doc. IMO

Reykjanes peninsula - seismic swarm of 02.24.2021 at 10.50 a.m. - Doc. IMO

After several severe earthquakes in the Reykjanes Peninsula on the morning of February 24, police, civil defense and the Earthquake Watch Service of the Meteorological Department declared the level of danger for the peninsula and region of the capital.

On February 24 at 10:05 am, there was an M5 earthquake. 7 to 3.3 km SSO of Keili.

This powerful seismic swarm is spreading over a relatively large area of ​​the Reykjanes Peninsula and Kristín Jónsdóttir, director of natural hazard monitoring at the Icelandic Met Office, said in Iceland Review that residents should be prepared for the possibility of even larger earthquakes.

At least 45 of the earthquakes in the swarm are greater than magnitude 3, and at least 9 above M4, according to preliminary reports released around 12:30 p.m. Earthquakes have more than one point of origin extending between Lake Kleifarvatn and the town of Grindavík in southwest Iceland.

Rocks fell from high points in Reykjanes and white steam jets from geothermal areas were seen in the area.

 

Updated maps are available at IMO / https://en.vedur.is/earthquakes-and-volcanism/earthquakes/reykjanespeninsula/, and an interactive map at: https://skjalftalisa.vedur.is/index.html # / page / map

Sources : IMO & Iceland Review

Reykjanes Peninsula - seismic swarm on 02/25/2021 at 07:35 a.m. - Doc. IMO
Reykjanes Peninsula - seismic swarm on 02/25/2021 at 07:35 a.m. - Doc. IMO
Reykjanes Peninsula - seismic swarm on 02/25/2021 at 07:35 a.m. - Doc. IMO

Reykjanes Peninsula - seismic swarm on 02/25/2021 at 07:35 a.m. - Doc. IMO

Reykjanes Peninsula - the main earthquake was preceded by various seismic foci in the previous 2 days - situation (right) of the number and magnitude of the current swarm - Doc. Dr. Stephen Hicks - a click to enlargeReykjanes Peninsula - the main earthquake was preceded by various seismic foci in the previous 2 days - situation (right) of the number and magnitude of the current swarm - Doc. Dr. Stephen Hicks - a click to enlarge

Reykjanes Peninsula - the main earthquake was preceded by various seismic foci in the previous 2 days - situation (right) of the number and magnitude of the current swarm - Doc. Dr. Stephen Hicks - a click to enlarge

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  Klyuchevskoy flank eruption - glow at both vents on 02.23.2021 - photo Volkstat.ru

 Klyuchevskoy flank eruption - glow at both vents on 02.23.2021 - photo Volkstat.ru

Klyuchevskoy - light plume of ash at the top and low location of the active eruptive site - photo Yuri Demyanchuk

Klyuchevskoy - light plume of ash at the top and low location of the active eruptive site - photo Yuri Demyanchuk

The flank eruption on the northwest slope of the Klyuchevskoy volcano continues to operate. A luminous incandescence over two craters of the flank eruption continues to be observed in satellite and video images, marking the poisition of the vents and the lava flows emitted.

A mudslide along the Krutenkaya River was noted on February 23 for about 7 km from the village of Klyuchi. KVERT continues to monitor the Klyuchevskoy volcano.

Moderate gas-vapor activity of the volcano continues. The danger of ash explosion up to 5-6 km (16,400-19,700 ft) a.s.l. flank craters remain. Ongoing activities could affect low-flying aircraft.

 

The aviation code has changed from yellow to orange.

 

Source: KVERT

Klyuchevskoy - activity from 02/23/2021 / 00-23:59 - image Sentinel-2 L1C bands 12.11.8A / Copernicus - one click to enlarge

Klyuchevskoy - activity from 02/23/2021 / 00-23:59 - image Sentinel-2 L1C bands 12.11.8A / Copernicus - one click to enlarge

IGPeru informs us that between February 15 and 21 the activity of Sabancaya remained at a moderate level, with an average of 71 explosions per day and the observation of ash plumes up to 3; 200 meters above the summit.

During this period, 1,984 earthquakes of volcanic origin associated with the circulation of magmatic fluids were recorded, VT earthquakes linked to the fracturing of rocks, of magnitude between 2.2 and 3.5, occurred in the north- west and west of the volcano.

The deformation does not present any significant anomalies; despite a slight inflation of the northern sector (Hualca Hualca volcano).

Ten thermal anomalies were identified, with VRP between 1 and 52 MW, linked to the presence of the lava dome.

The volcanic alert level remains orange, along with the inaccessible area of ​​12 km radius.

 

Source: I.G. Peru

Sabancaya - activity from 15.02 to 21.02.2021 - Doc. IGP

Sabancaya - activity from 15.02 to 21.02.2021 - Doc. IGP

A volcanic ash cloud eruption occurred in Raung on February 23 at 10:10 UTC (5:10 p.m. local time). The eruption and ash emission continues. The best estimate of the ash cloud top is around 4032m. above sea level which may be higher than what can be seen clearly. Source of altitude data: ground observer. The ash cloud is moving northeast.

 

Another volcanic ash cloud eruption was observed at 10:45 p.m. UTC (5:45 a.m. local time) on February 23. The eruption and ash emission continued on February 24. The best estimate of the ash cloud top is around 4,332m. above sea level. The ash cloud is moving east-south-east.

 

The Raung remains at level 2 / waspada

 

Source: PVMBG

Raung - plume of 02.24.2021 / 08.35 a.m. WIB - PVMBG webcam

Raung - plume of 02.24.2021 / 08.35 a.m. WIB - PVMBG webcam

During the last 24 hours, thanks to the monitoring systems of the Popocatépetl volcano, 25 exhalations accompanied by emissions of water vapor, volcanic gases and small amounts of ash have been identified.

In addition, two explosions, the first yesterday at 12:46 p.m. on February 22 and the last on February 23 at 1:23 a.m., for a total of thirteen explosions in the last 6 days.

The Cenapred recorded 532 minutes of trembling.
During the night, a slight incandescence could be observed above the crater.
Since the morning of February 23, a constant light emission of water vapor and volcanic gases has been observed, which disperse towards the west.

 

Volcanic alert remains at Amarillo Fase 2, with a 12 km radius safety zone

 

Sources: Cenapred & webcamsdeMexico

Popocatépetl - 02.23.2021 / 01:23 - WebcamsdeMexico

Popocatépetl - 02.23.2021 / 01:23 - WebcamsdeMexico

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