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Earth of fire

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

sismologia

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

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

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

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


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

 

Source: HVO

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

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

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

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

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

The alert level is at 3.

 

Source: Ovsicori

 Fuego - photo archive W.Chigna via Conred / 2020.12

Fuego - photo archive W.Chigna via Conred / 2020.12

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

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

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

 

Source: Insivumeh

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

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

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

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

 

Source: Kristin Jonsdottir

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

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

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

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

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

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

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

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

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

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

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

Over the last 24 hours:

- The surface deformations do not show any particular displacement.

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

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

 

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

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

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

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

 

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

 

Source: OVPF

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

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

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

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

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

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

 

The aviation code remains orange.

 

Source: KVERT

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

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

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

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

 

Source: HVO Daily Report

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

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

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

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

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

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

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

 

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

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

 

Source: IMO

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

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

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

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

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

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

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

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

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

 

Sources: Insivumeh & Conred

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

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

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

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

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

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

The eruption has continued since November 27, 2020.

 

Sources: PVMBG, Magma Indonesia and GVP

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

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

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

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

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

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

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

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

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

 

Sources: InVolcan, IGN, IGME

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

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

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

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

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

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

This activity is under surveillance.

 

Sources: IGN, InVolcan & Volcanes y Ciencia Hoy.

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

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

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

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

Semeru - 16.12.2021 - lahars et ash plumes

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

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

Observations sismiques du 16 décembre :

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

 
Source : PVMBG

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

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

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

 

Source: Sernageomin

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

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

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

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

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

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

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

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

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

 

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

 

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

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

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

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Publié le par Bernard Duyck
Publié dans : #volcanic activity, #Sismologia
La Palma / Cumbre Vieja - Growing fajana in Los Guirres - photo Canarias Ahora10.11.2021 - one click to enlarge

La Palma / Cumbre Vieja - Growing fajana in Los Guirres - photo Canarias Ahora10.11.2021 - one click to enlarge

The eruptive activity of Cumbre Vieja continues on La Palma
As of November 111 at 07:00 UTC, 72 earthquakes have been located in the area affected by the reactivation and volcanic eruption of Cumbre Vieja, seven of which were felt by the population of the epicentral area.
It should be noted that most of the activity recorded in the last 24 hours is at depths greater than 30 km below the central area of ​​Cumbre Vieja. It is in this area that the largest earthquake was recorded at 03:37 (UTC) today and corresponds to an earthquake of magnitude 5.0 (mbLg) which was felt with a maximum intensity of IV-V (EMS) . This earthquake was followed by a dense swarm of earthquakes at the same depth.
The tremor signal continues to remain at low values, with an episode of significant intensification between 03 and 04 UTC, coinciding with the swarm of deep earthquakes.

La Palma / Cumbre Vieja - earthquakes at 12.11.2021 / 06:50 - Doc. IGN

La Palma / Cumbre Vieja - earthquakes at 12.11.2021 / 06:50 - Doc. IGN

The island's network of permanent GNSS stations shows that after inverting the altitude on days 4 and 5 in station LP03, which is closest to the eruptive centers, it remains at a lower level than previously established. On the other hand, the southwest deformation recorded in the station still continues
In the rest of the stations, the slight deflation possibly linked to the deep seismicity has moderated.

Based on the calibrated image, a column height of 2,500 m is estimated at 08:45 UTC. On sea level.

The growth of the new fajana continues south of the previous one, with a large influx of lava so far. It is mainly increasing in width and already completely covers Los Guirres beach.

At around 3:30 p.m., a mouth that had previously emitted lava reactivated and it appears that there was a small overflow from the cone.

 

Regarding the air quality, it remains "good" or "reasonably good" in all seasons, with the exception of particular peaks in Los Llanos de Aridane at midday, where it has reached a regular or unfavorable level. Regarding sulfur dioxide emissions, "regular" levels are maintained in Puntagorda, but without exceeding the daily threshold. The weather conditions remain favorable for aeronautical operations.

 

Sources: IGEM, IGNes, DSN, Copernicus

Vulcano - fumaroles on 12.11.2021 / 08h48 - webcam Vlvh INGV

Vulcano - fumaroles on 12.11.2021 / 08h48 - webcam Vlvh INGV

An automatic station of the "Multigas" type has been installed on the edge of the crater of the Fossa di Vulcano, near the fumaroles. After a first test phase, from November 4, the station began to carry out continuous measurements of carbon dioxide (CO2) by infrared spectrometer, sulfur dioxide (SO2) and hydrogen sulphide (H2S) , by electrochemical sensors, as well as environmental parameters such as atmospheric pressure, temperature and humidity. . The data is transmitted in real time to the acquisition room of the Palermo section by radio link via the Lipari observatory.

The installation on Vulcano is part of the activities of the extension of the monitoring network of the volcano, following the change of the alert level from green to yellow ordered by the Department of Civil Protection of the island of Vulcano.

 

Source: INGV vulcani blog 11.11.2021

Vulcano - new Multigas automatic station - photo INGV vulcani

Vulcano - new Multigas automatic station - photo INGV vulcani

Images from Sentinel-2 and data from Mirova Modis show that activity has resumed in the Erta Ale caldera.

No recent news from visitors on site

 

Sources: Sentinel-2 & Mirova

Erta Ale - thermal anomalies in the caldera - image Sentinel-2 bands 12,11,4 from 08.11.2021 - one click to enlarge

Erta Ale - thermal anomalies in the caldera - image Sentinel-2 bands 12,11,4 from 08.11.2021 - one click to enlarge

Erta Ale - thermal anomalies at 11.10.201 - Doc. Mirova_MODIS_logVRP

Erta Ale - thermal anomalies at 11.10.201 - Doc. Mirova_MODIS_logVRP

On November 11 at 1:21 p.m., an M5.2 earthquake occurred at Vatnafjöll in southern Iceland, about 7.5 km south of the Hekla volcanic system. The hypocenter was about 5.6 km deep

The earthquake was widely felt in southern Iceland and the capital region. Seismic activity started in the area around noon and there is considerable aftershock activity. The most important aftershocks are around M3.

According to Kristín Jónsdóttir, seismologist at IMO, this earthquake is similar to that of 1987. It occurred in the eastern part of the fault line, where the seismic and volcanic belts meet. So far, no sign of magma movements but probability of aftershocks. This opinion is shared by Magnús Tumi Guðmundsson, professor of geophysics.

 

Sources: IMO & specialists cited

Swarm of earthquakes near Hekla at 11.11.2021 / 15:10 - location and magnitude of earthquakes - Doc. IMO
Swarm of earthquakes near Hekla at 11.11.2021 / 15:10 - location and magnitude of earthquakes - Doc. IMO
Swarm of earthquakes near Hekla at 11.11.2021 / 15:10 - location and magnitude of earthquakes - Doc. IMO

Swarm of earthquakes near Hekla at 11.11.2021 / 15:10 - location and magnitude of earthquakes - Doc. IMO

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

Effusive and explosive activity continues in La Palma / Cumbre Vieja, at high levels. During the night and this morning, frequent lava rises occurred at the level of the crater.
Large amounts of lava can be seen flowing in waves from the pierced crater, covering the lower northwest flanks of the cone with leaf-shaped flows.
These lava floods are likely caused by partial collapses at or around the lower vent in particular.

According to Pevolca & InVolcan, a new eruptive vent has opened southeast of the main vent. It ejects gases and pyroclasts.

La Palma / Cumbre Vieja - gas and pyroclast emissions from the new vent - photo CSIC 15.10.2021

La Palma / Cumbre Vieja - gas and pyroclast emissions from the new vent - photo CSIC 15.10.2021

The two streams that are south of La Laguna mountain are monitored, as they could converge and reach the sea.

The last Copernicus map dated October 14 at 19:02 UTC mentions 733 ha covered by lava flows, and 1,817 buildings destroyed.

La Palma - Cumbre Vieja - images Sentinel-2 bands 12.11.4 (top) and bands 12.11.8A (bottom) from 15.10.2021- one click to enlarge
La Palma - Cumbre Vieja - images Sentinel-2 bands 12.11.4 (top) and bands 12.11.8A (bottom) from 15.10.2021- one click to enlarge

La Palma - Cumbre Vieja - images Sentinel-2 bands 12.11.4 (top) and bands 12.11.8A (bottom) from 15.10.2021- one click to enlarge

La Palma Cumbre Viela - the lava flows at 14.10.2021 / 19:02 UTC - Doc.Copernicue EMSR

La Palma Cumbre Viela - the lava flows at 14.10.2021 / 19:02 UTC - Doc.Copernicue EMSR

The CSIC posted a video in which Vincente Soler, titular volcanologist, exhibits a sample taken by a colleague in an area near the eruptive center which, in the absence of laboratory verification, is inclined to classify as pre-oceanic sediment. island (more than 2 million years old), with strong similarities with the "restingolitas" emitted during the eruption of the submarine Tagoro volcano, in El Hierro.

 

Sources: IGNes, CSIC, InVolcan, Pevolca, IGM, Copernicus.

La Palma Cumbre Vieja - 14.10.2021- sample similar to "restingolitas" presented by Vicente Soler, volcanologist at CSIC. - Image CSIC

La Palma Cumbre Vieja - 14.10.2021- sample similar to "restingolitas" presented by Vicente Soler, volcanologist at CSIC. - Image CSIC

Lava effusion continued this week at the Great Sitkin in the Aleutian Arc, and lava now fills more than half of the summit crater. Satellite imagery from October 11 showed that two lava lobes, flowing over low points on the crater rim, extend down a slope 330 m to the south and 350 m to the west. Lava also reached the rim of the crater on its northern periphery. In a few areas, lava advanced over snow and ice, but no abnormal melting, vapor formation or water accumulation was observed. This indicates that melt rates are likely low and that there is no indication of impending hydrological hazards.

The lava lobes which have passed the edge of the summit crater flow into small valleys developed on the volcanic edifice. The terrain is steep in these areas, and boulders of lava and lava rubble could break away from the terminus of the flow lobes without warning and form small rock avalanches in these valleys. Such avalanches can release ash and gas and could travel several hundred meters beyond lava flows; they would be dangerous for anyone in these areas.

Satellite imagery shows a likely-formed boulder deposit extending 450 m beyond the western flow lobe terminus.

The level of seismicity has been slightly elevated over the past week and there have been persistent small earthquakes likely associated with the ongoing lava flow. No explosive activity or ash emission was detected in seismic, infrasound, satellite or web camera data.

There is no indication of how long the lava flow lasted during the current eruption, and it is possible that explosive activity could occur with little or no warning.

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

 

Source: AVO

Great Sitkin - WorldView-3 SWIR image from 02.10.2021 / 22:56 UTC - Doc.AVO MM.Loewen (The red-orange areas are high temperature lava, while the blue is snow. The light blue is the vegetation and browns to blacks are the rock.) - one click to enlarge

Great Sitkin - WorldView-3 SWIR image from 02.10.2021 / 22:56 UTC - Doc.AVO MM.Loewen (The red-orange areas are high temperature lava, while the blue is snow. The light blue is the vegetation and browns to blacks are the rock.) - one click to enlarge

In Merapi, on Java, during the week of October 8 to 14, 2021, the BPPTKG reports avalanches of incandescent blocks were observed 41 times towards the southwest with a maximum sliding distance of 2,000 m.

The height of the southwest lava dome has decreased by ± 2 m, and the height of the central lava dome has been increased by approximately ± 4 m. The volume of the southwest lava dome is 1,609,000 m³ and the central dome is 2,927,000 m³.

This week's seismicity is higher than that of last week. The Merapi deformation which was monitored using EDM and GPS this week showed no significant changes.

Merapi - activity from 09.10.2021 / 05.37 loc. - Doc. PVMBG Magma Indonesia

Merapi - activity from 09.10.2021 / 05.37 loc. - Doc. PVMBG Magma Indonesia

Merapi - morphological changes of the past week - Doc. BPPTKG 10/14/2021

Merapi - morphological changes of the past week - Doc. BPPTKG 10/14/2021

Merapi - seismicity between 8 and 14.10.2021 - Doc. BPPTKG

Merapi - seismicity between 8 and 14.10.2021 - Doc. BPPTKG

The activity level remains at 3 / siaga.

The current potential danger consists of lava avalanches and hot clouds in the southeast-southwest sector for a maximum of 3 km to the Woro River, and 5 km to the Gendol, Kuning, Boyong rivers. , Bedog, Krasak, Bebeng and Putih. 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.

 

Sources: BPPTKG, PVMBG and Magma Indonesia.

Bali - Tectonic earthquake of M 4.8 and localization near the Agung - Doc. BMKG - one click to enlarge
Bali - Tectonic earthquake of M 4.8 and localization near the Agung - Doc. BMKG - one click to enlarge

Bali - Tectonic earthquake of M 4.8 and localization near the Agung - Doc. BMKG - one click to enlarge

An earthquake of M4.8 was recorded between Agung and Batur, on Bali, this 16.10.2021 at 03:18 WIB; destruction is reported in Rendang / Karangasem.

Three aftershocks followed.

To be monitored carefully: landslides are likely to occur and new cracks may open following these earthquakes.

 

Source: BMKG

Bali / NW of Agung - Damage after the M4.8 earthquake on October 16, 2021 - BMKG photos

Bali / NW of Agung - Damage after the M4.8 earthquake on October 16, 2021 - BMKG photos

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Publié le par Bernard Duyck
Publié dans : #volcanic activity, #Sismologia
La Palma / Cumbre Vieja - 3 active craters as of 05.10.2021 / 11:43 p.m. - Doc. TVC

La Palma / Cumbre Vieja - 3 active craters as of 05.10.2021 / 11:43 p.m. - Doc. TVC

Eruptive activity continues at Cumbre Vieja on La Palma: During the night of October 5 to 6, powerful fountains are observed at three craters.

The height of the eruptive column measured at 7:30 UTC on October 5 is 4,000 m, showing a slight descent of the eruptive cloud.

Sulfur dioxide emissions mainly concern West Africa and the Atlantic, where they would extend to the Caribbean.

La Palma - strong SO2 signal at a distance of 15.0 km at CumbreVieja with 56.21DU of SO2 -. Weight estimated at less than 300 km 41.5 kt. - image Sentinel-5P / Tropomi 05.10.2021 - Doc. DLR / BIRA / ESA

La Palma - strong SO2 signal at a distance of 15.0 km at CumbreVieja with 56.21DU of SO2 -. Weight estimated at less than 300 km 41.5 kt. - image Sentinel-5P / Tropomi 05.10.2021 - Doc. DLR / BIRA / ESA

Since 24 hours, 75 earthquakes have been located in the southern part of the island of La Palma, near the current volcanic eruption.
An increase is observed both in the number of earthquakes and in their magnitudes compared to previous days, 7 of the recorded earthquakes have a magnitude greater than or equal to 3.5 (mbLg).

As in previous days, most of the seismicity is located 10-15 km deep, in the area where the swarm started on September 11, although 7 of them are located deeper, between 25 and 40 km.

The average amplitude of the volcanic tremor shows a slight gradual increase since yesterday morning and continues in the same average range of values ​​compared to that observed in this eruption. No significant pulse has been recorded in the past 24 hours.

La Palma / Cumbre Vieja - seismicity at 05.10.2021 / 12:45 - Doc. IGNes

La Palma / Cumbre Vieja - seismicity at 05.10.2021 / 12:45 - Doc. IGNes

The island's network of permanent GNSS stations shows slight deflation in the vertical component of stations near eruptive centers. These results are consistent with those obtained by InSAR, in which we can see an area that presents a pattern compatible with a possible subsidence between the Sentinel1 images of September 28 and October 4.
 

Pevolca and DSN report that the affected area exceeds 420.12 hectares on October 5 at 3 p.m., 6.74 hectares more than the day before. The lava flows remain in their bed, with a maximum width of 1,250 m. The ashes impacted an area of ​​1,750 ha. The lava delta covers 36 ha.

 

Sources: IGNes, Pevolca, RTVC, Copernicus, European Commission, DSN

La Palma / Cumbre vieja - - earthquakes, lava flows, extension of ashes at 05.10.2021 / 07h - Doc. CIEM - one click to enlarge

La Palma / Cumbre vieja - - earthquakes, lava flows, extension of ashes at 05.10.2021 / 07h - Doc. CIEM - one click to enlarge

From July 2021, INGV's monitoring systems have highlighted the variation of certain geophysical and geochemical signals at Vulcano, in particular those linked to the activity of the hydrothermal system which supplies the fumaroles of the Fossa crater and the degassing zone. from the Grotte dei Palizzi, located at the southern base of the cone.

In more detail, an increase in the temperature of these fumaroles and a variation in the composition of the gases were observed, with a greater contribution from the components directly linked to the magmatic degassing (CO2 and SO2).

The temperature of the fumarole gases increased to maximum values ​​of 340 ° C. Diffuse outgassing along the southern edge of the crater has also increased.

Vulcano - fumaroles bordering the crater - photo archives © Bernard Duyck

Vulcano - fumaroles bordering the crater - photo archives © Bernard Duyck

From a seismic point of view, from September 13 a significant increase in microseismicity was observed in the area of ​​the La Fossa crater. This low-energy seismicity, generally localized in the first kilometer of depth under the cone, is linked both to duct resonance phenomena and to fracturing processes in a hydrothermal environment, where weathered rocks have poor mechanical properties.
The current phase of increase was also characterized by the presence of seismic events (called VLP, Very Long Period events) with a lower frequency than that of microseisms. These seismic signals have never been recorded for 15 years; their presence is compatible with an increase in fluids which induces pressurization of the ducts and consequent resonance phenomena. As for the seismicity of fracturing (earthquakes) linked to the dynamics of the tectonic structures present in the Vulcain region, it did not show significant variations and remains at a very low level.

With regard to soil deformations, from mid-August GPS measurements showed a modest expansion of the area of ​​the Fossa cone. This process accelerated in mid-September, and is still ongoing, with maximum displacements of up to 1 cm (northward, on the north side of the cone).

 

Source: INGVvulcani blog

Morphotectonic map of Vulcano - Doc. INGV & image Sentinel-2 / 03.10.2021 - one click to enlargeMorphotectonic map of Vulcano - Doc. INGV & image Sentinel-2 / 03.10.2021 - one click to enlarge

Morphotectonic map of Vulcano - Doc. INGV & image Sentinel-2 / 03.10.2021 - one click to enlarge

Vulcano La Fossa - 06.10.2021 / 07:27 - webcam INGV

Vulcano La Fossa - 06.10.2021 / 07:27 - webcam INGV

In Nyiragongo / DRC, Mirova records moderate thermal anomalies, between VRP 13 and 78 Mw, for the period from October 3 to 6 ... activity returns to the crater.

 

Source: Mirova

Nyiragongo - Sentinel-2 bands 12,11,8A & Modis thermal volcanic activity at 04.10.2021 - Doc. Mirova _Last

Nyiragongo - Sentinel-2 bands 12,11,8A & Modis thermal volcanic activity at 04.10.2021 - Doc. Mirova _Last

A seismic swarm started on 09/27/2021 and is still in progress just south of Keilir, in the Reykjanes Peninsula, at the northern end of the dyke that intruded in February-March this year.

About 7000 earthquakes have been detected, 16 with M3-M4.2, about 2.5 / day since 9/29.

 

Source : IMO / Kristín Jónsdóttir

Keilr - IMO update on 05.10.2021 - Via Kristín Jónsdóttir

Keilr - IMO update on 05.10.2021 - Via Kristín Jónsdóttir

Reykjanes Peninsula - location and magnitude of earthquakes southwest of Keilir - Doc. IMO
Reykjanes Peninsula - location and magnitude of earthquakes southwest of Keilir - Doc. IMO
Reykjanes Peninsula - location and magnitude of earthquakes southwest of Keilir - Doc. IMO

Reykjanes Peninsula - location and magnitude of earthquakes southwest of Keilir - Doc. IMO

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Publié dans : #volcanic activity, #Sismologia

Since the last press release and until 24 hours yesterday, September 26, there was little seismicity in the eruptive zone of Cumbre Vieja, with a single earthquake located at 21:03 UTC of magnitude 2.5 (mbLg). Throughout this morning, between 4:00 a.m. and 7:00 a.m. UTC, a seismic swarm occurred in the area with 16 earthquakes located between 7 and 14 km deep.
The largest earthquake occurred at 06:05 UTC with 3.2 (mbLg).

The average amplitude of the volcanic tremor remained around the average values ​​of yesterday's eruption and began to increase sharply from 9 p.m. It reached a maximum value at 00:00 today and from that time until 9:00 a.m. it dropped sharply, coinciding with the observations of a decrease in surface flow on September 27.

La Palma - pulses of ashes and tremor - 27.09.2021 in the morning - InVolcan

La Palma - pulses of ashes and tremor - 27.09.2021 in the morning - InVolcan

The lava is no longer visible and sporadic ash emissions continue. They fall on La Palma, but also on the other Canary Islands.

"What happened today is ultimately only the result of the lack of gas in the magmatic system" according to David Calvo, spokesperson for InVolcan

This new calmer phase is normal, but we must keep an eye on the evolution of the eruption: at the seismic level, long-period hybrid events or LP mixed with rupture earthquakes or "tornillos" are observed, first-order eruptive precursors, indicating a short-term eruption.

La Palma / Cumbre Vieja éruption - de grands quantités de cendres sont tombées et menacent l'intégrité des habitations - photo auteur inconnu

La Palma / Cumbre Vieja éruption - de grands quantités de cendres sont tombées et menacent l'intégrité des habitations - photo auteur inconnu

La Palma / Cumbre Vieja - sismo. showing tornillo-type earthquakes - Doc. IGN 09/27/2021 / 3:16 p.m.

La Palma / Cumbre Vieja - sismo. showing tornillo-type earthquakes - Doc. IGN 09/27/2021 / 3:16 p.m.

La Palma / Cumbre Vieja -sismogram and spectrogram from 09/27/2021/16 at 6 p.m. loc. - Doc. IGNes - one click to enlarge

La Palma / Cumbre Vieja -sismogram and spectrogram from 09/27/2021/16 at 6 p.m. loc. - Doc. IGNes - one click to enlarge

La Palma / Cumbre Vieja - trémor at 09/28/2021 / 6:36 a.m. - Doc. IGNes

La Palma / Cumbre Vieja - trémor at 09/28/2021 / 6:36 a.m. - Doc. IGNes

Around 6:45 p.m., RTVC announced the reactivation of the activity, with weak Strombolian explosions.

After a period of calm, an effusive phase has arrived where lava flows, of a more fluid nature, descend from the main cone.

The volcano formed several mouths which specialized in different things:

- the lowest at the base of the pyroclastic cone are those which expel the most lava, very hot fluids very liquid> 1200ºC and with little gas, Hawaiiana type.

- the middle of the strombolian type pyroclastic cone with much more gas and which forms the ash and lapilli explosions, as well as the pyroclastic cone and finally

- behind the main cone and in the higher areas, there are more explosions of very violent phreatomagmatic type, which project many gases and water vapor at high speed, forming a lot of very fine ash ... (Volcanes y Ciencia Hoy)

La Palma / Cumbre Vieja - resumption of Strombolian activity in the evening of 27.09.2021 - Doc. RTVC

La Palma / Cumbre Vieja - resumption of Strombolian activity in the evening of 27.09.2021 - Doc. RTVC

La Palma / Cumbre Vieja - 09.27.2021 / 8 p.m. / webcam therm. InVolcan and lava flows at 9:40 p.m. / InVolcan - one click to enlargeLa Palma / Cumbre Vieja - 09.27.2021 / 8 p.m. / webcam therm. InVolcan and lava flows at 9:40 p.m. / InVolcan - one click to enlarge

La Palma / Cumbre Vieja - 09.27.2021 / 8 p.m. / webcam therm. InVolcan and lava flows at 9:40 p.m. / InVolcan - one click to enlarge

7 additional hectares have been covered since the last data. The south flow maintains a low flow rate. The northern flow, more active, is between 800 and 1,000 meters from the coast of Tazacorte

First estimate of the quantity emitted by the eruption of La Palma: 46.3 million m³ of material expelled on September 27, 2021 (press release from IGNes)

 

Sources : IGNes, RTVC, Copernicus, Volcanes y Ciencia Hoy

Suwanosejima - 09/27/2021 / 9:06 p.m. - JMA webcam

Suwanosejima - 09/27/2021 / 9:06 p.m. - JMA webcam

An eruption occurred at Suwanosejima (Mitake crater) at 1:51 p.m. on the 26th, accompanied by a plume that rose 2200m above the crater rim.
The volcanic ash moves southwest of the crater, and within an hour, is reported in large quantities of ash in the village of Toshima

In the area going from the crater about 4 km to the southwest, there is a risk of fallout from small volcanic bombs.

On September 27 at 9 p.m., the JMA announced the incandescence accompanying an eruption 700 meters above Mitake crater.

 

Source: JMA

Crete island - M6 earthquakes of 09/27/2021 / 6:17 GMT - EMSC location map

Crete island - M6 earthquakes of 09/27/2021 / 6:17 GMT - EMSC location map

An earthquake, of magnitude 5.8 according to the Geodynamic Observatory of Athens, M6 according to the American Institute USGS, occurred at 06:17 GMT on 27.09.2021 about twenty kilometers from Heraklion, capital of the island of Crete. It was followed by many aftershocks of strong magnitude (M4.5 - 4.3) It particularly affected the agricultural town of Arkalohori, where a worker died and where extensive damage was observed, according to Spiros Georgiou, head of the Civil Protection press office. Nine people were slightly injured.


The epicenter of the earthquake, with a depth of 10 km, was recorded 346 km south of the Greek capital, according to the Athens Observatory.
Stephen Hicks pointed out that this is an outage that has yet to be mapped, but is similar to the two neighboring sowers. It is the strongest earthquake since 1959 in Crete.

 

 

Sources: EMSC, RTBf

Crete island - - M6 / 27.09.2021 earthquake and localization in relation to faults - Doc. GFZ - Geofon / Caputo & al - one click to enlarge

Crete island - - M6 / 27.09.2021 earthquake and localization in relation to faults - Doc. GFZ - Geofon / Caputo & al - one click to enlarge

Crete island - 09.27.2021 - extensive material damage in this area to old buildings - photo via EMSC

Crete island - 09.27.2021 - extensive material damage in this area to old buildings - photo via EMSC

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Karymsky - photo D. Melnikov / IVS FEB RAS, KVERT 09/17/2021

Karymsky - photo D. Melnikov / IVS FEB RAS, KVERT 09/17/2021

A moderate eruptive activity continues at Karymsky, with an ash plume on September 17 at 2,000-2,500 meters asl. extending eastward for 38 km.

On September 18, explosions were accompanied by an ash plume at more than 4,300 m. asl., moving 145 km east and northeast of the volcano.

A thermal anomaly marks the volcano.

The aviation code remains orange, other ash explosions can occur at any time, reaching an altitude of 6-7 km and affecting air traffic.

 

Sources: KVERT & Mirova / Sentinel-2

Karymsky - image Sentinel-2 bands 12,11,8A and Modos thermal volcanic activity from 09.19.2021 / 00h41 - Doc. Mirova S2MIR_Last

Karymsky - image Sentinel-2 bands 12,11,8A and Modos thermal volcanic activity from 09.19.2021 / 00h41 - Doc. Mirova S2MIR_Last

In Fagradalsfjall, around 2:45 p.m. on September 18, police and civil defense announce the closure of Trail A. Lava has now started to flow over the reserve areas near Trail A and it won't be long before it begins to flow on the path and up to Nátthagakriki.

Police and rescue teams are now working to clear the trail. People are ordered to go to trail B or C. Trail C is particularly recommended in this regard. Caution is recommended: the course of events remains unpredictable and lava can flow with great speed.

 

Around 5:40 p.m. local time, the tremor began to drop suddenly ... yet another behavior of this surprising volcano. Due to the weather on webcams, it's hard to tell how long the lava is flowing or if lava is still in the crater.

 

Sources: Police and Civil Defense of Suðurnes, Hraun.vedur, RUV, mbls

Fagradalsfjall - fall of the tremor on 19.09.2021 - Doc. Hraun.vedur.is

Fagradalsfjall - fall of the tremor on 19.09.2021 - Doc. Hraun.vedur.is

The seismic activity in Cumbre Vieja / La Palma, which started on the 11 at 03:18 (UTC), has decreased over the past 48 hours, however, over the past 12 hours there has been a slight increase with an earthquake of magnitude 3.2 mbLg located at 03:26 (UTC) today, at a depth of 0.1 km, which was felt by the population of intensity III (EMS98). So far and since the start of the series, 5391 earthquakes have been detected, of which 1102 have been located.

The maximum cumulative vertical deformation is of the order of 10 cm in the zone close to seismicity and its distribution is still compatible with a center of pressure in this zone. These movements were observed both with the island's GNSS network and with InSAR data (Sentinel-1).

Source: IGN 18.09.201

La Palma - seismic swarms at 18.09.2021 / 12h - IGNes

La Palma - seismic swarms at 18.09.2021 / 12h - IGNes

La Palma - nbr. earthquakes per hour between 10.09 and 18.09 - Doc. InVolcano

La Palma - nbr. earthquakes per hour between 10.09 and 18.09 - Doc. InVolcano

La Palma - interferometric analyzes by Sentinel-1 / variations between 2 satellite passes - one click to enlargeLa Palma - interferometric analyzes by Sentinel-1 / variations between 2 satellite passes - one click to enlarge

La Palma - interferometric analyzes by Sentinel-1 / variations between 2 satellite passes - one click to enlarge

La Palma remains under close monitoring :

INVOLCAN today installed a seismic network on La Palma. It will allow a type of signal: the volcanic tremor, to be detected with more sensitivity, if it occurs.
A seismic network is a set of seismic stations installed at a short distance from each other which, in addition to detecting seismic waves, makes it possible to establish the direction from which these waves originate.
Using analysis techniques similar to those used by telecommunication antennas, this tool will detect with even more sensitivity any seismic signal coming from inside the volcano, including volcanic tremor, which is an important precursor of a possible eruptive phase.
This activity was made possible thanks to the VOLRISKMAC (MAC / 3.5b / 124) and VOLRISKMAC II (MAC2 / 3.5b / 328) projects, co-financed by the INTERREG VA Spain-Portugal MAC Cooperation Program (Madeira-Azores-Canaries) 2014- 2020 from the European Commission.

Update from 4.30 p.m. (Canary Island time): no significant thermal anomaly was observed in the surface environment of the western slope of Cumbre Vieja and in the summit area, during helicopter overflight

Source :  InVolcan

La Palma - 09.18.2021 - Installation of the seismic network, IR thermography by helicopter, sampling in Dos Aguas (Barranco de las Angustias) by the teams InVolcan - one click to enlarge
La Palma - 09.18.2021 - Installation of the seismic network, IR thermography by helicopter, sampling in Dos Aguas (Barranco de las Angustias) by the teams InVolcan - one click to enlargeLa Palma - 09.18.2021 - Installation of the seismic network, IR thermography by helicopter, sampling in Dos Aguas (Barranco de las Angustias) by the teams InVolcan - one click to enlarge

La Palma - 09.18.2021 - Installation of the seismic network, IR thermography by helicopter, sampling in Dos Aguas (Barranco de las Angustias) by the teams InVolcan - one click to enlarge

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Publié dans : #volcanic activity, #Sismologia
  Klyuchevskoy - the lava from the flank eruption on the snow this 13.03.2021 - Sentinel-2 image via Coperncus - one click to enlarge

 Klyuchevskoy - the lava from the flank eruption on the snow this 13.03.2021 - Sentinel-2 image via Coperncus - one click to enlarge

Klyuchevskoy - Sentinel 2 band image 12,11,8A from 03.15.2021 / 12:26 am via Mounts project

Klyuchevskoy - Sentinel 2 band image 12,11,8A from 03.15.2021 / 12:26 am via Mounts project

At Klyuchevskoy, a moderate flank explosive-effusive eruption and gas-vapor emission activity from the summit of Klyuchevskoy volcano continues.

KVERT satellite data showed a significant thermal anomaly on the flank eruption on the northwest slope of the volcano.

The color code for aviation remains orange.

 

Sources: KVERT & Mirova

Klyuchevskoy - high thermal anomalies at 03/16/2021 / 3:05 am - Doc. Mirova _MODIS_Latest10NTI

Klyuchevskoy - high thermal anomalies at 03/16/2021 / 3:05 am - Doc. Mirova _MODIS_Latest10NTI

Klyuchevskoy - 16.03.2021 / 07:40 - current activity on the flank  - webcam IVS FEB RAS KVERT

Klyuchevskoy - 16.03.2021 / 07:40 - current activity on the flank - webcam IVS FEB RAS KVERT

An eruption occurred at G. Sinabung, North Sumatra on March 15, 2021 at 18:08 h with an ash plume observed at ± 2,000 m above the summit (± 4,460 m above sea level) . The observable ash columns are gray, with a thick intensity, leaning towards the southwest and the west. This eruption is recorded by seismogram with a maximum amplitude of 15 mm and a duration of 6 min 27 sec.

 

Currently, Sinabung is in Activity Level 3 / siaga, with recommendations for society and visitors / tourists not to do activities on resettled villages, as well as locations within a 3 km radius of the summit. of Sinabung, as well as 5 km of sector radius for the south-eastern sector, and 4 km for the east-north sector.

 

Sources: PVMBG, Magma Indonesia and Komunitas Beidar Sinabung

Sinabung - eruptive plume of 03.15.2021 / 6:50 p.m. - PVMBG webcam

Sinabung - eruptive plume of 03.15.2021 / 6:50 p.m. - PVMBG webcam

Sinabung - the dome(s) this 03/16/2021 / 07:48 WIB - photo Firdaus Surbakti via Beidar Sinabung

Sinabung - the dome(s) this 03/16/2021 / 07:48 WIB - photo Firdaus Surbakti via Beidar Sinabung

In the Reykjanes Peninsula, as of March 15, a total of 1,800 earthquakes have been detected by the IMO seismic network, including seven M3.0 or more. The strongest M4.3 earthquakes occurred at 10:32 p.m. northeast of Fagradalsfjall Most of the earthquakes detected today were located near Fagradalsfjall and in the evening mostly northeast of Fagradalsfjall.

Between midnight and 5:43 am on March 16, around 500 earthquakes were detected in the Reykjanes peninsula, no earthquakes were measured above M3.0. The activity was mostly centered around Mt. Fagradalsfjall and east of Mt. Þorbjörn.

Reykjanes Peninsula in southwest Iceland and the strongest earthquakes - Sentinel image 3 / 03.14.2021 via Copernicus

Reykjanes Peninsula in southwest Iceland and the strongest earthquakes - Sentinel image 3 / 03.14.2021 via Copernicus

According to the latest InSAR document of Saturday March 13, there is an opening of 20 cm., and a progression of the dyke towards the southwest, in a line marked by the locations of the earthquakes.

Reykjanes - last InSAR document of 13.03.2021 indicating a widening and progression of the dyke towards the SO - Doc. IMO

Reykjanes - last InSAR document of 13.03.2021 indicating a widening and progression of the dyke towards the SO - Doc. IMO

Reykjanes Penisula - one of the many dykes exposed by erosion, illustrating what is happening underground today - photo dave McGarvie

Reykjanes Penisula - one of the many dykes exposed by erosion, illustrating what is happening underground today - photo dave McGarvie

Massive improvements have been made to the cGPS and seismic monitoring networks on the Reykjanes Peninsula. Many stations have been added, with the cooperation of ISOR, the Czech Academy of Sciences and the University of Cambridge with IMO.

 

Sources: IMO, ISOR

Reykjanes Peninsula - improvement of surveillance networks as of 15.03.2021 - Doc. via IMO - one click to enlarge

Reykjanes Peninsula - improvement of surveillance networks as of 15.03.2021 - Doc. via IMO - one click to enlarge

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