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Earth of fire

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

Articles avec #volcanic activity catégorie

Publié le par Bernard Duyck
Publié dans : #volcanic activity, #Sismologia
 Karymsky - photo D. Melnikov. IVS FEB RAS, KVERT 13.10.2020

 Karymsky - photo D. Melnikov. IVS FEB RAS, KVERT 13.10.2020

Karymsky - Volcanic ash advisory - Doc Vaac Tokyo 21.10.2020 - 0600Z

Karymsky - Volcanic ash advisory - Doc Vaac Tokyo 21.10.2020 - 0600Z

According to data from AMC Elizovo (pilots), explosions from the Karymsky sent ash up to 4,000 m. altitude, around 02:30 UTC on October 21. The ash plume continues to drift south-east of the volcano for 40 km. The last Karymsky explosions were noted on July 29, 2020.

Moderate eruptive activity of the volcano continues. Ash explosions up to 19,700-23,000 feet (6-7 km) above sea level could occur at any time. Ongoing activities could affect low-flying planes.

The aviation code has changed to orange.

 

Sources: KVERT & VAAC Tokyo

 Merapi - photo BPPTKG 10/21/2020 / 6:29 a.m.

Merapi - photo BPPTKG 10/21/2020 / 6:29 a.m.

Merapi - summary of the seismic activity of 20.10.2020 / 00-24h WIB - Doc. BPPTKG

Merapi - summary of the seismic activity of 20.10.2020 / 00-24h WIB - Doc. BPPTKG

Thanks to the seismographic recordings of October 20, 2020, it was recorded at Merapi, where the activity seems more intense:

- 28 earthquake collapse

- 37 blast earthquakes

- 27 low frequency earthquake

- 83 hybrid / multiphase earthquakes

- 18 shallow volcanic earthquakes

- 2 distant tectonic earthquakes.

The current potential danger is in the form of pyeoclastic flows associated with the collapse of the lava dome and the fall of volcanic material due to explosive eruptions.

Activity level remains at 2 / waspada, with a 3 km no-go zone from the summit.

 

Sources: PVMBG & BPPTKG

Villarica - photo Sernageomin 20.10.2020 17:22 loc.

Villarica - photo Sernageomin 20.10.2020 17:22 loc.

On October 20 at 5:22 p.m. local time, an LP earthquake occurred in Villarica, associated with a moderate explosion at the active crater, accompanied by an ash plume reaching 240 meters above the emission bridge.

No significant changes in seismicity, the volcanic technical alert remains at amarilla.

 

Source: Sernageomin

 Reykjanes Peninsula - earthquakes at 20.10.2020 / 15:40 - Doc .IMO

Reykjanes Peninsula - earthquakes at 20.10.2020 / 15:40 - Doc .IMO

Reykjanes Peninsula - earthquakes at 21.10.2020 / 06:30 - Doc .IMO
Reykjanes Peninsula - earthquakes at 21.10.2020 / 06:30 - Doc .IMO
Reykjanes Peninsula - earthquakes at 21.10.2020 / 06:30 - Doc .IMO

Reykjanes Peninsula - earthquakes at 21.10.2020 / 06:30 - Doc .IMO

At 1:43 p.m. on October 20, an M5.6 earthquake occurred in Núpshlíðarháls, about 5 km west of the Seltún geothermal area on the Reykjanes peninsula.

The earthquake was felt widely across the country, particularly in the southern part of the Reykjanes peninsula and in the capital region, about 25 km from the epicenter.The earthquake was felt also in the Westman Islands and Borgarnes.

To date, more than 250 aftershocks have been detected, the most important of the period between 3:27 pm and 3:32 pm The most important was M4.1, the other earthquakes between 3.0 and 3.8 . There is no sign of volcanic unrest in the area.

Krýsuvík - small slow landslide on 20.10.2020 - photo Arni Saeberg / mbl.is

Krýsuvík - small slow landslide on 20.10.2020 - photo Arni Saeberg / mbl.is

Today's earthquake is the largest measured earthquake in the Reykjanes Peninsula since 2003.

"There is a long term active process underway in the region and we can expect that there will be more earthquakes in the coming hours that will make themselves felt all the way to the capital region. ", says Kristín Jónsdóttir, seismic risk coordinator at the Islandic Met Office, in an interview with RÚV today.

GPS measurements indicate that a slow landslide is taking place near Krýsuvík, according to Kristín Jónsdóttir. When asked about the next steps, she says an announcement has been received of an unusually strong smell of gas and Kristín believes that today's large earthquake "only took root in the geothermal system."

 

Sources: IMO, RUV, EMSC

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Publié le par Bernard Duyck
Publié dans : #volcanic activity

During the morning of October 18, the Nevado del Ruiz presented plumes of gas and vapor, dense and white, reaching a height of about 1,400 meters, dispersing in a WWW direction.

The activity level is 3 / amarillo, marking a change in the behavior of volcanic activity.

 

Source: S.G.Columbiano

Suwanosejima - 20.10.2020 / 08:56 - JMA webcam

Suwanosejima - 20.10.2020 / 08:56 - JMA webcam

The JMA reports a new eruptive episode in Suwanosejima, in the Ryukyu archipelago, this October 20 at 8:56 am local time; an ash plume developed up to 1,300 meters above the crater.

 

Source: JMA

Sabancaya - summary of the activity between 12 and 18 October 2020 - Doc. IGP

Sabancaya - summary of the activity between 12 and 18 October 2020 - Doc. IGP

The Geophysical Institute of Peru (IGP) reports that the eruptive activity of the Sabancaya volcano continues at moderate levels, explosions, on average 34 daily, with plumes of ash and gas up to 3 km high at the top of the volcano, followed by ash falls in the districts of Huanca and Madrigal.

The IGP recorded the occurrence of 1858 earthquakes of volcanic origin associated with the circulation of internal magmatic fluids.

During the period, Volcano-Tectonic (VT) earthquakes were localized mainly to the northwest and east of Sabancaya, with magnitudes between M2.0 and M2.8.

The monitoring of the deformation of the volcanic structure, using GNSS techniques (processed with fast orbits), has shown since October 11 a slight process of deflation of the south-eastern flank of the Sabancaya. Satellite surveillance identified the presence of 7

Thermal anomalies with values ​​of 2 MW and 25 MW, associated with the presence of a lava body (in the process of destruction) on the surface of the volcano's crater.

The volcanic alert level remains orange, with a prohibited zone with a radius of 12 km around the crater.

 

Source: I.G. Peru

Piton de La Fournaise - 2020.10.19 13h50 TU - Camera Partage  - OVPF

Piton de La Fournaise - 2020.10.19 13h50 TU - Camera Partage - OVPF

At Piton de La Fournaise, an inflation of the summit area and in the far field is still recorded, testifying to a pressurization of a superficial and deep source.

The OVPF informed, for this 19 octobre, 9 landslides and 4 VT earthquakes.

Carbon dioxide emissions are stable or increasing at all stations.

 

Source: OVPF / Preliminary Bulletin.

Piton de La Fournaise - Illustration of the deformation over 2 months. The baselines (variation in distance between two GPS receivers) crossing the Piton de la Fournaise building, at the top (top), the base of the terminal cone (in the middle) and in the far field (bottom) are shown here. ) (see location on the associated maps). An increase is synonymous with elongation and therefore swelling of the volcano; conversely, a decrease is synonymous with contraction and therefore deflation of the volcano. The possible periods colored in light pink correspond to the eruptions. - OVPF

Piton de La Fournaise - Illustration of the deformation over 2 months. The baselines (variation in distance between two GPS receivers) crossing the Piton de la Fournaise building, at the top (top), the base of the terminal cone (in the middle) and in the far field (bottom) are shown here. ) (see location on the associated maps). An increase is synonymous with elongation and therefore swelling of the volcano; conversely, a decrease is synonymous with contraction and therefore deflation of the volcano. The possible periods colored in light pink correspond to the eruptions. - OVPF

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Publié le par Bernard Duyck
Publié dans : #volcanic activity
 Sangay - 17.10.2020 / 20:40 UTC - yellow spot at the bottom of the image, with the ash plume to the west (left) Doc. GOES-16

 Sangay - 17.10.2020 / 20:40 UTC - yellow spot at the bottom of the image, with the ash plume to the west (left) Doc. GOES-16

Sangay - Volcanic ash advisory for 17-18.10.2020 - Doc. VAAC Washington

Sangay - Volcanic ash advisory for 17-18.10.2020 - Doc. VAAC Washington

.Since the morning of October 17, 2020, the SAGA seismic station in Sangay has recorded an increase in the number of explosions; this type of activity is similar to that observed during the eruptive period that began in May 2019.

These explosions could be associated with other phenomena, such as ash falls, or the remobilization of materials accumulated on the sides of the volcano.

 

An image from the GOES-16 satellite shows an ash cloud moving westward, potentially causing light ash fall over Chimborazo province.

The VAAC Washington reports 4 notices of ash emissions at a height of 570 meters above the crater, dispersing to the west.

 

The alert level is amarillo

 

Sources: IGEPN and VAAC Washington

Santiaguito - 17.10.2020 - white degassing - photo Conred

Santiaguito - 17.10.2020 - white degassing - photo Conred

In Guatemala, the activity of the Caliente dome of Santiaguito continues, with the extrusion of lava in blocks and degassing.

A white plume 3,000 meters asl high is. present, replaced during the explosions by an ash and gas plume at 3,300 meters asl. causing light ash fall in the vicinity of the volcanic complex.

Avalanches of boulders and ash descend the southern flank to the base of the dome. Pyroclastic flows are possible.

 

Sources: Insivumeh & Conred

Etna NSEC "saddle vent" - Strombolian activity on 10/18/2020 / 12:28 am - LAVE webcam

Etna NSEC "saddle vent" - Strombolian activity on 10/18/2020 / 12:28 am - LAVE webcam

Current activities:

- at Kerinci / VAAC Darwin and

- at the "Saddle vent" of the Etna NSEC / Boris Behncke and LAVE webcam.

Villarica - explosive sequence of 10/15/2020 / 5:34 am - Doc.POVI - one click to enlarge

Villarica - explosive sequence of 10/15/2020 / 5:34 am - Doc.POVI - one click to enlarge

The POVI has uploaded photos illustrating the violent eruptive episode of October 15 at 5:34 am at Villarica (see article  http://www.earth-of-fire.com/2020/10/news-from-villarica-nevados-de-chillan-mauna-loa-and-bromo.html)

The active lava lake, with a diameter of 5 to 6 meters, maintains a depth of 150 meters.

Satellite images show pyroclasts covering snow and ice cover up to 3,000 meters in length; these traces are left by the eruptive impulses of October 9 and 15, 2020.

During the month, the POVI documented at least 7 eruptive impulses.

 

Source: POVI

Villarica - deposits of pyroclasts on the flanks of the volcano - Copernicus images of 12 and 15.10.2020 / POVI

Villarica - deposits of pyroclasts on the flanks of the volcano - Copernicus images of 12 and 15.10.2020 / POVI

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Publié le par Bernard Duyck
Publié dans : #volcanic activity
Popocatépetl - control flight of 16.10.2020 - Doc. Cenapred / Seguridad / CNPC

Popocatépetl - control flight of 16.10.2020 - Doc. Cenapred / Seguridad / CNPC

This October 16, with the support of the National Guard, expert staff from the Institute of Geophysics of the National Autonomous University of Mexico (UNAM) and the National Center for Disaster Reduction (CENAPRED), an overview of the Popocatépetl volcano been carried out to verify its terms and conditions. It has been visualized that the inner crater maintains a diameter of 360 to 390 meters and the approximate depth is 120 to 170 meters; the interior of the crater is covered with tephra.

Popocatépetl - control flight of 16.10.2020 - Doc. Cenapred / Seguridad / CNPC
Popocatépetl - control flight of 16.10.2020 - Doc. Cenapred / Seguridad / CNPC

Popocatépetl - control flight of 16.10.2020 - Doc. Cenapred / Seguridad / CNPC

The observatory recorded 165 exhalations accompanied by volcanic gas emissions and sometimes light amounts of ash. In addition, 51 minutes of low amplitude tremor and a volcano-tectonic earthquake were recorded yesterday at 10:58 am with a magnitude of 2.6.

During the night, a slight incandescence could be observed above the crater.
Then since the morning, an emission of water vapor, gas and a slight amount of ash has been observed, which is dispersed in a southwest direction.

The alert remains at Amarillo Fase 2, with a 12 km radius forbidden zone.

 

Source: Cenapred

Kerinci - eruptive activity of 17.10.2020 - photo @aksesnews / via Rizal Twitter - one click to enlargeKerinci - eruptive activity of 17.10.2020 - photo @aksesnews / via Rizal Twitter - one click to enlarge

Kerinci - eruptive activity of 17.10.2020 - photo @aksesnews / via Rizal Twitter - one click to enlarge

An orange VONA was issued for Kerinci, on the island of Sumatra, following an eruption on October 17 at 3:40 am local time, accompanied by an ash plume at 4,605 ​​meters asl. the eruption is in progress and ash emissions continue.

For the day of October 16, the PVMBG informs:

- 107 blast earthquakes, with an amplitude of 0.5 to 6 mm and the earthquake lasted 10 to 25 seconds.

- 4 distant tectonic earthquakes, with an amplitude of 13-32 mm, S-P 16-43 seconds and a long earthquake of 36-170 seconds.

- 1 episode of continuous Tremor, with an amplitude of 0.5-1 mm, dominating 1 mm.

The activity level remains at 2 / waspada.

Communities around Kerinci Volcano and visitors / tourists are not allowed to climb the crater on top of Kerinci Volcano within 3 km of the active crater (people are prohibited from doing activities within the danger radius.

 

Sources: PVMBG, Magma Indonesia and VAAC Darwin

Merapi - 17.10.2020 - photo PGM Selo

Merapi - 17.10.2020 - photo PGM Selo

At Merapi, in activity level 2 / waspada with a forbidden zone of 3 km radius around the summit, the main crater emits a white plume, of a fine to medium intensity, about 20 meters from the summit.

This October 16, 2020, it was recorded:

- 9 earthquakes of earth collapse

- 18 low frequency earthquakes

- 95 hybrid / multiphase earthquakes (note a sharp increase in this type of earthquake)

- 4 shallow volcanic earthquakes

- 5 tectonic earthquakes
 

Merapi - seismicity at 16.10.2020 - BPPTKG

Merapi - seismicity at 16.10.2020 - BPPTKG

Recommendation: 

The current potential danger is in the form of pyroclastic flows following the collapse of the lava dome and the fall of volcanic material due to explosive eruptions.

 

Source: PVMBG

Kanlaon - summit craters - photo archives 2017

Kanlaon - summit craters - photo archives 2017

The Kanlaon Volcano Monitoring Network recorded seven (7) volcanic earthquakes during the 24 hour observation period. Moderate emission of white vapor-laden plumes was observed rising 200 meters before drifting northwest and northeast.

Sulfur dioxide emissions were measured at an average of 656 tonnes / day on October 13, 2020.

Ground deformation data from continuous GPS measurements indicates slight inflation of lower and middle slopes since June 2020, while electronic monitoring of the short-term tilt on the southeast flanks has recorded inflation on the slopes. below average which began on June 21, 2020. These parameters may indicate hydrothermal or magmatic processes occurring under the edifice.

 

DOST-PHIVOLCS wishes to remind the public that the Kanlaon volcano is on Alert Level 1, which means it is in an abnormal state and has entered a period of unrest. Local communities and the public are strongly reminded that entry into the permanent danger zone (PDZ) with a radius of 4 kilometers must be strictly prohibited.

 

Source: Phivolcs

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Publié le par Bernard Duyck
Publié dans : #volcanic activity
Villarica - moderate explosion of 15.10.2020 / 8:05 am local - Sernageomin

Villarica - moderate explosion of 15.10.2020 / 8:05 am local - Sernageomin

The Sernageomin recorded two LP earthquakes in Villarica, associated with moderate explosions at the level of the active crater, this October 15 at 5:34 am local, accompanied by incandescence, and a gray plume and at 8:04 am local, accompanied by a gray plume with particulate material. Displacements have been reduced, respectively by 111 cm² and 5.5 cm². At the surface, the plumes did not exceed 450 meters, and dispersed to the east. They have slightly grayed out the white cover of the volcano.

The technical alert remains in Amarilla.

 

Source: Sernageomin

Nevados de Chillan - photo Josefauna 13.10.2020

Nevados de Chillan - photo Josefauna 13.10.2020

Nevados de Chillan - areas possibly impacted by volcanic processes as of 13.10.2020 - Sernageomin

Nevados de Chillan - areas possibly impacted by volcanic processes as of 13.10.2020 - Sernageomin

In Nevados de Chillan, the latest report from Sernageomin indicates that the parameters of rock fracturing and internal fluid dynamics (VT, LP and Tr earthquakes) remain unchanged.

The effusive activity is characterized by the extrusion of lava which accumulates in the crater and which overflows, forming a lava flow approximately 615 meters long on the north side.

The explosive activity does not produce plumes greater than 1,500 meters, with a majority gas content. Some episodes show a content of reddish pyroclasts.

The lava dome is increasing slightly, according to satellite measurements.

Night-time incandescence is observed when the weather permits.

A new map of potentially at-risk areas has been published by Sernageomn / Onemi

Mauna Loa - the summit caldera - image archives USGS HVO 10.2019

Mauna Loa - the summit caldera - image archives USGS HVO 10.2019

During the previous week, the deformation and seismicity ratios of Mauna Loa on the island of Hawaii do not show any significant change, but remain above baseline levels observed over the long term.

Seismometers recorded 80 small earthquakes of magnitude less than 2.5 below the summit and upper flanks; the majority of earthquakes occurred at a depth of less than 8 km.

A slight inflation is always present, corresponding to a magmatic input to the shallow storage system.

Gas concentrations and fumarole temperature remain stable for the summit and Sulfur cone in the southwest rift zone.

The alerts remain identical: Advisory and Yellow, without eruption.

 

Source: HVO

Bromo - 10.15.2020 - photo by Øystein Lund Andersen

Bromo - 10.15.2020 - photo by Øystein Lund Andersen

Øystein Lund Andersen mentions a drone observation of the Bromo, in the Tengger / East Java caldera, on October 15, which reveals differences in the color of the waters of the crater between 2019 and October 15, 2020; its color has changed from grayish to green, probably under the effect of volcanic gases. There is no indication of the water level in the crater.

The PVMBG reports a continuous tremor, with a dominant amplitude of 1 mm for this October 15.

 

The last Bromo data eruption of July 19, 2019.

The activity level is 2 / waspada.

 

Sources: PVMBG & courtesy to Øystein Lund Andersen / Twitter

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Publié le par Bernard Duyck
Publié dans : #volcanic activity
 Sinabung - Pyroclastic flow of 1000 m. on 15.10.2020 / 13h17 WIB - Doc. PVMBG

Sinabung - Pyroclastic flow of 1000 m. on 15.10.2020 / 13h17 WIB - Doc. PVMBG

At Sinabung, the plume of the main crater is white, and about 50 to 300 meters above the summit. Avalanches were observed on October 14 and 15, with a sliding distance of 100 to 150 meters east on 14, and 1,000 meters east-southeast on October 15.

In terms of seismicity, the PVMBG provides information for October 14, 2020:

- 18 earthquakes of collapse,

- 8 blast earthquakes,

- 2 low frequency earthquakes.

For this October 15, from 00h to 12h, the observatory recorded

8 collapse earthquakes, and 2 blast earthquakes

 

Source: PVMBG

Fuego - 14.10.2020 / 10h - acoustic waves and activity of the last hours - Doc. Insivumeh

Fuego - 14.10.2020 / 10h - acoustic waves and activity of the last hours - Doc. Insivumeh

In Fuego / Guatemala, Insivumeh reports, in its activity report for September, a total of 2,306 explosions.

In mid-October, 1,037 explosions were recorded, including 5 strong explosions over the last 18 hours, accompanied by white-gray plumes of 1,000 meters above the crater. On October 14 at 10 a.m., an illustrated explosion, qualified as moderate, generated an avalanche in the barranca Ceniza.

As all the drainages can be affected by avalanches in their upper part, caution is recommended.

 

Source: Insivumeh

Sabancaya - summary of the activity from 5 to 11.10.2020 - Dic. I.G. Peru

Sabancaya - summary of the activity from 5 to 11.10.2020 - Dic. I.G. Peru

The Geophysical Institute of Peru (IGP) reports that the eruptive activity of the Sabancaya volcano, for the period from October 5 to 11, continues at moderate levels, with explosions at an average rate of 34 per day, accompanied by columns of ash and gas up to 3.9 km high at the top of the volcano.

The IGP recorded and analyzed the occurrence of 2027 earthquakes of volcanic origin associated with the circulation of magnetic fluids in the Sabancaya.

During this period, Volcano-Tectonic (VT) earthquakes were localized mainly to the northeast and northwest of Sabancaya.

The monitoring of the deformation of the volcanic structure, using GNSS techniques (processed with fast orbits), does not present any significant anomalies; however, a slight deflation of the SE flank of the Sabancaya has been observed since October 3. Satellite monitoring has identified the presence of 4 thermal anomalies with values ​​between 5 MW and 24 MW, associated with the presence of a lava body on the surface of the volcano's crater.

Sabancaya - 14.10.2020 - strong plume of sulfur dioxide - Doc. Tropomi / DLR / BIRA / ESA

Sabancaya - 14.10.2020 - strong plume of sulfur dioxide - Doc. Tropomi / DLR / BIRA / ESA

Tropomi reports strong plumes of sulfur dioxide on October 6, with 12.78 DU of SO2, and on October 14, 11.10 DU of SO2.

The volcanic alert level remains orange, with a prohibited zone of 12 km in radius.

 

Sources: IGP & Tropomi

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Publié le par Bernard Duyck
Publié dans : #volcanic activity
Pacaya - 13.10.2020 - Flir thermal  and in natural light images - by William Chigna
Pacaya - 13.10.2020 - Flir thermal  and in natural light images - by William Chigna

Pacaya - 13.10.2020 - Flir thermal  and in natural light images - by William Chigna

In Guatemala, Insivumeh continues to observe weak to moderate explosions in the Pacaya on October 13, with projections 75-150 meters above the Mackenney crater, and a plume of gas and steam in a westerly direction at low altitude.

The lava flow on the northern flank is reported with a length of 250 meters.

Tremor is recorded associated with the ascent of magma, and movements of gas and lava flow.

 

Source: Insivumeh and William China.

Nevado del Ruiz - photo SGC archives

Nevado del Ruiz - photo SGC archives

In Nevado del Ruiz, the seismicity generated by the fracturing of rocks increased in number of earthquakes and in energy released compared to the previous week.

A few "drumbeat" type episodes associated with low energy fracturing have been recorded. They are associated with the process of evolution of the dome of the Arenas crater.

Seismicity linked to the dynamics of internal fluids is also on the rise.

The SGC does not report significant changes in surface deformation.

The gas and steam plumes reached heights of up to 1,350 meters above the summit.

 

The level of activity remains amarillo.

 

Source: weekly bulletin of the SGC at 13.10.2020 / 10:30 p.m. local

Sheveluch - dôme (more light grey) on 10/13/2020 - IVS webcam

Sheveluch - dôme (more light grey) on 10/13/2020 - IVS webcam

In Kamchatka, the new dome of Sheveluch continues to grow, with these October 12 and 13, a strong emission of fumaroles, and an incandescence of the blocks that make it up.

A thermal anomaly was spotted by satellite, going up to VRP 61MW on October 13 at 00:40.

 

Source: KVERT & Mirova

Sheveluch - thermal anomalies at 14.10.2020 / 01:25 - Doc. Mirova_MODIS_logVRP

Sheveluch - thermal anomalies at 14.10.2020 / 01:25 - Doc. Mirova_MODIS_logVRP

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Sinabung - glowing dome and collapse on 11.10.2020 / 19:11 - photo Sadrah Peranginangin via Beidar Sinabung

Sinabung - glowing dome and collapse on 11.10.2020 / 19:11 - photo Sadrah Peranginangin via Beidar Sinabung

In Sinabung, in activity level 3 / Siaga, avalanches were observed with a sliding distance of 300 to 700 meters to the east and south-east.

The seismicity of October 11 was characterized by

- 14 collapse earthquakes

- 10 blast earthquakes

- 1 low frequency earthquake

- 1 local tectonic earthquake

- 3 distant tectonic earthquakes.

This October 12, the PVMBG reports, between 00 and 06h, an earthquake of collapse with an amplitude of 76-95 mm and an earthquake duration of 79-106 seconds.

 

Sources: PVMBG & Beidar Sinabung

Rincon de La Vieja - the active crater - photo archives 2020.01.27 Comisión Nacional de Emergencias

Rincon de La Vieja - the active crater - photo archives 2020.01.27 Comisión Nacional de Emergencias

In Costa Rica, the Rincon de La Vieja presented two eruptive episodes on October 11, respectively at 10:09 am local and 5:46 pm local; the height of the plumes could not be increased due to poor visibility conditions.

The first episode lasted 1 minute, and tape and discontinuous tremor was recorded (0.7 - 5 Hz).

The duration of the second episode is also one minute.

 

Source: Ovsicori

The Icelandic volcano Grimsvötn is usually hidden under a glacier, but the May 2011 eruption melted the ice here and exposed the crater. - photo © Boaworm / CC-by-sa 3.0 - one click to enlarge

The Icelandic volcano Grimsvötn is usually hidden under a glacier, but the May 2011 eruption melted the ice here and exposed the crater. - photo © Boaworm / CC-by-sa 3.0 - one click to enlarge

According to the Icelandic Met office, several signs of increasing activity (frequency of earthquakes, inflation, geothermal activity and rising heat flow) are noticed at Grimsvötn, which saw its aviation code change from green to yellow on September 30.

Volcanologist Magnús Guðmundsson, from the University of Iceland, explains that an increase in seismicity and heat flux is observed 6 months to 2 years before an eruption.

The water level of the subglacial lake, present above the Grimsvötn, increased sharply and reached higher values ​​than in 2004 and 2010, marked by jökulhlaup (glacial debacles) ... the sudden pressure relief destabilizes the volcano, and may cause an eruption.

Increased monitoring of the volcano is required during this period of increased activity.

 

Source: ScineXX

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 Etna - fumaroles a la Bocca Nuova - photo Gio Giusa 9-10.10.2020

Etna - fumaroles a la Bocca Nuova - photo Gio Giusa 9-10.10.2020

At Etna, the activity of the summit craters continues, with gas emissions at the NE crater (NEC), fumaroles in the Bocca Nuova and Strombolian activity and ash emissions at the Selle vent of the new crater SE (NSEC) this October 10.

Mirova reports a high thermal anomaly this October 11 of VRP 170 MW.

 

Sources: Gio Giusa, Boris Behncke, Mirova, Sentinel-2

Etna NEC - gas emission - photo Gio Giusa 09-10.10.2020

Etna NEC - gas emission - photo Gio Giusa 09-10.10.2020

Etna - incandescence at the north-east crater and the New south-east crater - image Sentinel 2 bands 12,11,4 from 09.10.2020 - one click to enlarge

Etna - incandescence at the north-east crater and the New south-east crater - image Sentinel 2 bands 12,11,4 from 09.10.2020 - one click to enlarge

Etna - thermal anomalies Sentinel 2 bands 12,11,8A from 09.10.2020 / 10h. - one click to enlarge

Etna - thermal anomalies Sentinel 2 bands 12,11,8A from 09.10.2020 / 10h. - one click to enlarge

Etna - high thermal anomaly at 11.10.2020 / 01:25 - Mirova_MODIS_VRP

Etna - high thermal anomaly at 11.10.2020 / 01:25 - Mirova_MODIS_VRP

The VAAC Tokyo issued an ash scattering advisory to the South-East on 11.10.2020 at 0000Z for the Karymsky; the height of the ashes corresponds to a flight altitude of 60.

As Olga Girina specifies, it is resuspended ash, and not a consequence of eruption.

 

Sources : VAAC Tokyo & O. Girina

Karymsky - Volcanic ash advisory 11.10.2020 / 0000Z - Doc. VAAC Tokyo

Karymsky - Volcanic ash advisory 11.10.2020 / 0000Z - Doc. VAAC Tokyo

In Sinabung, the seismicity of this October 11 between 00 and 12h WIB is characterized by:

- 8 collapse earthquakes, with an amplitude of 5-56 mm and a long earthquake of 54-80 seconds.

- 7 blast earthquakes, with an amplitude of 2 to 21 mm and the duration of the earthquake was 21 to 47 seconds.

- 1 low frequency earthquake with an amplitude of 18 mm and the earthquake lasted 19 seconds.

- 1 local tectonic earthquake with an amplitude of 7 mm, S-P 2.1 seconds and a long earthquake of 24 seconds.

- 2 distant tectonic earthquakes with an amplitude of 8-70 mm, S-P 36 seconds and the duration of the earthquake 191-220 seconds.

 

The activity level remains at 3 / siaga, with the usual attendance and access restrictions.

 

Source: PVMBG

Sinabung - 11.10.2020 / 03:44 - webcam PVMBG

Sinabung - 11.10.2020 / 03:44 - webcam PVMBG

Sinabung - 11.10.2020 / 06:10 WIB - PVMBG webcam

Sinabung - 11.10.2020 / 06:10 WIB - PVMBG webcam

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Publié le par Bernard Duyck
Publié dans : #volcanic activity
Merapi - under the clouds 10.10.2020 / 11.57 am WIB- Webcam PVMBG

Merapi - under the clouds 10.10.2020 / 11.57 am WIB- Webcam PVMBG

In Merapi, on the island of Java, in activity level 2 / waspada, the BPPTKG reports that the number of multiphase hybrid earthquakes has doubled compared to the previous days.

Merapi - seismicity at 09.10.2020 - Doc. BPPTKG

Merapi - seismicity at 09.10.2020 - Doc. BPPTKG

Merapi - seismicity at 09.10.2020 - Doc. Magma Indonesia

Merapi - seismicity at 09.10.2020 - Doc. Magma Indonesia

For October 10 / 00 - 12am WIB, the seismicity is characterized by:

- 4 collapse earthquakes, with an amplitude of 5 to 45 mm and a duration of 11.5 to 27.7 seconds.

- 2 blast earthquakes, with an amplitude of 5 to 11 mm and the earthquake lasted 11.8 to 24.1 seconds.

- 1 low frequency earthquake, with an amplitude of 3 mm and the earthquake lasted 15.8 seconds.

- 11 hybrid / multiphase earthquakes, with an amplitude of 2-42 mm, S-P 0.3-0.5 seconds and the duration of the earthquake of 6-12.2 seconds.

 

Recommendations:

- Current potential dangers: pyroclastic flows due to the collapse of the lava dome and the fall of volcanic materials due to explosive eruptions.

- Areas without human activities within a radius of 3 km from the summit

- The public must anticipate the dangers of volcanic ash from pyroclastic flows and explosive eruptions.

- The community should be aware of the dangers of lahar, especially when it is raining around the top of Mount Merapi.

 

Sources: PVMBG, BPPTKG. Magma Indonesia

Klyuchevskoy - photos A.Demyanchuk / Volkstat 07-08.10.2020 - via Shérine France
Klyuchevskoy - photos A.Demyanchuk / Volkstat 07-08.10.2020 - via Shérine France

Klyuchevskoy - photos A.Demyanchuk / Volkstat 07-08.10.2020 - via Shérine France

Brief news:

 

In Kamchatka, effusive activity is maintained in Klyuchevskoy, as evidenced by these photos of October 7-8 (see article of 09,10,2020)

Sources: Volkstat / via Shérine France & KVERT

 Karymsky - Volcanic Ash advisory for 09.10.2020 - Doc. VAAC Tokyo

Karymsky - Volcanic Ash advisory for 09.10.2020 - Doc. VAAC Tokyo

VAAC Tokyo issued a volcanic ash advisory for the Karymsky on 09.10.2020, directed to the SSE.

Lengai - Doc. Mirova / Sentinel 2 bands 12,11,8A at 05.10.2020 / 8h00

Lengai - Doc. Mirova / Sentinel 2 bands 12,11,8A at 05.10.2020 / 8h00

Lengai - thermal anomalies at 09.10.2020 / 11:15 p.m. - Doc. Mirova - one click to enlarge
Lengai - thermal anomalies at 09.10.2020 / 11:15 p.m. - Doc. Mirova - one click to enlarge

Lengai - thermal anomalies at 09.10.2020 / 11:15 p.m. - Doc. Mirova - one click to enlarge

Small thermal anomalies are reported at Ol Doinyo Lengai and Nishinoshima

Source: Mirova

Nishinoshima - thermal anomalies at 10.10.2020 / 03:30 - Doc. MirovaMODIS_logVRP

Nishinoshima - thermal anomalies at 10.10.2020 / 03:30 - Doc. MirovaMODIS_logVRP

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