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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
Sinabung - evolution of the eruptive plume of 08/23/2020 / 7:41 - 8:15 am - Magma Indonesia photos - Sadrah Peranginangin and Endro Rusharyanto - one click to enlargeSinabung - evolution of the eruptive plume of 08/23/2020 / 7:41 - 8:15 am - Magma Indonesia photos - Sadrah Peranginangin and Endro Rusharyanto - one click to enlarge
Sinabung - evolution of the eruptive plume of 08/23/2020 / 7:41 - 8:15 am - Magma Indonesia photos - Sadrah Peranginangin and Endro Rusharyanto - one click to enlarge

Sinabung - evolution of the eruptive plume of 08/23/2020 / 7:41 - 8:15 am - Magma Indonesia photos - Sadrah Peranginangin and Endro Rusharyanto - one click to enlarge

The Sinabung presented an eruption on Sunday 23 August 2020 at 07:41 WIB, accompanied by a column of gray, thick ash, observed ± 1500 m above the peak (± 3960 m above sea level) dispersing to the east. This eruption was recorded on a seismograph with a maximum amplitude of 25 mm and a duration of 747 seconds.

During the day of August 22, 5 blast earthquakes were recorded.

 

The activity level remains at 3 / siaga.

 

Source: PVMBG & Magma Indonesia

Volcano Sinabung eruption - 23/08/2020 Mount Sinabung erupted on Sunday, 23 August 2020, at 07:41 WIB with height ash column observed ±1500m above peak

 Langila - hot spots - image Sentinel-2 L1c bands 12,11,4 du 21.08.2020

Langila - hot spots - image Sentinel-2 L1c bands 12,11,4 du 21.08.2020

In Papua New Guinea, VAAC Darwin reports an ash emission from the Langila volcano, located west of New Britain Island, at an altitude of flight 60 on August 22 / 13:12Z.

Hot spots can be seen on the Sentinel-2 image from August 21.

 

Sources: VAAC Darwin and Sentinel-2

Erta Ale - image Sentinel-2 L2A bands 4,3,2 - 08/21/2020 - one click to enlarge

Erta Ale - image Sentinel-2 L2A bands 4,3,2 - 08/21/2020 - one click to enlarge

Erta Ale - hot spots - Sentinel-2 L1C bands 12,11,4 - 21.08.2020 - one click to enlarge

Erta Ale - hot spots - Sentinel-2 L1C bands 12,11,4 - 21.08.2020 - one click to enlarge

In Afar, Sentinel-2 images reveal hot spots at the Erta Ale caldera, both at the north and south pit-crater. No more thermal anomaly in the far field.

 

Source: Sentinel-2

In the Philippines, the Taal is seeing its number of volcanic earthquakes increase, with 16 earthquakes in the last 24 hours on 08/22/8:00 a.m., and 20 earthquakes in the last 24 hours at 08/23/8:00 a.m.

Fumaroles are reported at a height of 10 meters on the 22nd, and 5 meters on the 23.08.2020.

The alert level remains at 1 / abnormal, and a risk of sudden phreatic explosions, ash falls and expulsion / accumulation of volcanic gas on Volcano island which remains a danger zone not recommended.

 

Source: Phivolcs

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Publié le par Bernard Duyck
Publié dans : #volcanic activity
Pacaya - 20.08.2020 - photo Conred

Pacaya - 20.08.2020 - photo Conred

During the past week, Strombolian activity continued in Pacaya.

The explosions eject materials up to 200 meters above the crater; nocturnal incandescence is reported as well as a constant white-bluish degassing at the Mackenney crater.

Its northwest flank is considered an unstable area; thermal anomalies, cracks and a lava flow reaches a length of 300 meters, accompanied by degassing and small avalanches are observed there.

The fallout is weak to moderate, and affects San Francisco de Sales, el Patrocinio, El Rodeo, localities located within a radius of 4 km.

 

Source: Insivumeh and Conred

Santiaguito - 08.21.2020 - Photo Conred

Santiaguito - 08.21.2020 - Photo Conred

At Santiaguito, the Caliente dome exhibits weak to moderate explosions, some with an ash plume reaching 3,300 to 3,600 meters asl. and dispersing within a 10-12 km radius of the volcanic complex. There is an average of 40 explosions per day, according to Conred.

This activity continuously generates avalanches in the direction of a large southern sector and in its western part. Night incandescence is observed. The possibility of larger pyroclastic flows is mentioned by the observatory.

 

Source: Insivumeh & Conred.

Santiaguito - A: Incandescence and degassing at the Caliente dome - B: Weak avalanche in a southerly direction on the path towards the base of the dome - Photos Insivumeh

Santiaguito - A: Incandescence and degassing at the Caliente dome - B: Weak avalanche in a southerly direction on the path towards the base of the dome - Photos Insivumeh

At Sinabung, on August 21, 2020, we note two eruptive episodes at 5:17 a.m. WIB and 9:46 p.m. WIB, recorded on the seismogram with a maximum amplitude of 28 to 78 mm and a duration of 821 to 1421 seconds.

In addition, seismicity is characterized by

- 6 blast earthquakes, with an amplitude of 3 to 15 mm and the earthquake lasted 20 to 45 seconds.

- 16 low frequency earthquakes, with an amplitude of 2 to 7 mm, and the duration of the earthquake was 10 to 27 seconds.

- 1 deep volcanic earthquake, with an amplitude of 4 mm, S-P 2.8 seconds and the duration of the earthquake 18 seconds.

- 3 local tectonic earthquakes, with an amplitude of 12-56 mm, S-P 2.2-3.3 seconds and one long earthquake of 22-45 seconds, and 2 distant tectonic earthquakes.

 

A lahar is reported on August 22 at 11:20 WIB in Kuta Mbaru, carrying liquid mud and tree trunks and stones. - link

 

The activity level remains at 3 / siaga, with a red aviation code.

 

Sources: PVMBG, Magma Indonesia, Beidar Sinabung and VAAC Darwin.

Sinabung - seismicity as of 08/21/2020 - Doc. Magma Indonesia

Sinabung - seismicity as of 08/21/2020 - Doc. Magma Indonesia

In Suwanosejima, activity has been constant for a few days, as relayed by the VAAC Tokyo and the JMA.

The Strombolian eruptions are reported by local observers, including two strong on August 21 at 14:49 and 04:52 ; According to the JMA, a large volcanic bomb landed 600 meters from Mitake crater; the possible fallout area is set at 1 km radius around Mitake, and ash fallout is possible up to 4 km.

On August 22 at 5:06 am, an eruption was accompanied by an ash plume 1,500 meters above the crater, with no dispersion towards the northeast, causing significant fallout on the village of Toshima within an hour.

The alert level is at 2.

 

Source: JMA & VAAC Tokyo.

Suwanosejima - archive image N.Geshi 05.11.2009

Suwanosejima - archive image N.Geshi 05.11.2009

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Publié le par Bernard Duyck
Publié dans : #volcanic activity
Sinabung - gathering of photographers at sunset - photo Endro Rusharyanto 20.08.2020

Sinabung - gathering of photographers at sunset - photo Endro Rusharyanto 20.08.2020

This August 20, the Sinabung was topped by a white and gray plume about 500 meters high, under cloudy to rainy weather.

Seismicity is characterized by

- 7 blast earthquakes, with an amplitude of 3 to 16 mm and the earthquake lasted 15 to 45 seconds.

- 64 low frequency earthquakes with an amplitude of 2 to 31 mm, and the duration of the earthquake was 8 to 45 seconds.

- a local tectonic earthquake with an amplitude of 11 mm, S-P of 5 seconds and a long earthquake of 18 seconds.

- 2 distant tectonic earthquakes, with an amplitude of 4-10.5 mm, S-P 17-43.6 seconds and the duration of the earthquake was 103-180 seconds.

- 4 continuous tremor episode with an amplitude of 0.5-18 mm, dominant 2 mm.

 

The aviation code has been changed from red to orange for the PVMBG, but remains red for the VAAC Darwin

The activity remains at level 3 / siaga.

Sinabung - impact of ash on the vegetation - photo Endro Rusharyanto 21.08.2020

Sinabung - impact of ash on the vegetation - photo Endro Rusharyanto 21.08.2020

Sinabung - plume and clouds merge this 21.08.2020 / 11.54 am local - Doc. webcam PVMBG / Magma Indonesia

Sinabung - plume and clouds merge this 21.08.2020 / 11.54 am local - Doc. webcam PVMBG / Magma Indonesia

This Friday, August 21, 2020 at 05:17 WIB, an eruption occurred, without visual observation, but recorded on a seismograph with a maximum amplitude of 78 mm and a duration of 821 seconds.

From 6 to 12 p.m. local time, the volcano is covered by fog; no observation is possible.

The PVMBG reports a blast earthquake, with an amplitude of 15 mm, lasting 27 seconds.

 

Sources: PVMBG, Magma Indonesia and VAAC Darwin.

Nishinoshima - consequent widening of the pyroclastic cone crater - photo Japan Coast Guards 08.19.2020 / 1:25 p.m.-2:15 p.m.

Nishinoshima - consequent widening of the pyroclastic cone crater - photo Japan Coast Guards 08.19.2020 / 1:25 p.m.-2:15 p.m.

Nishinoshima - significant degassing, but low plume - photo Japan Coast Guards 08/19/2020 / 1:25 p.m.-2:15 p.m.

Nishinoshima - significant degassing, but low plume - photo Japan Coast Guards 08/19/2020 / 1:25 p.m.-2:15 p.m.

An overflight of Nishinoshima was carried out by the Japan Coast Guards on August 19 between 1:25 p.m. and 2:15 p.m.

Despite the veil of clouds, one can notice a consequent widening of the crater of the pyroclastic cone, already partly noticed on the satellite images of August 14 ; a strong diffusion on the infrared images testifies to the activity in the crater, and on a large delta at the edge of the sea.

Degassing generates a rather white plume, generous but not very high ... which is confirmed by the satellite images, on which the ash clouds are not identifiable.

 

Sources: Japan Coast guards, JMA, VAAC Tokyo, Nasa worldview.

Nishinoshima - strong IR footprint above the crater and on a lava delta, weaker on a flow on the opposite side - photo Japan Coast Guards 08.19.2020 / 1:25 p.m. - 2:15 p.m.

Nishinoshima - strong IR footprint above the crater and on a lava delta, weaker on a flow on the opposite side - photo Japan Coast Guards 08.19.2020 / 1:25 p.m. - 2:15 p.m.

Nishinoshima - strong IR footprint in the crater - photo Japan Coast Guards 08/19/2020 / 1:25 p.m. - 2:15 p.m.

Nishinoshima - strong IR footprint in the crater - photo Japan Coast Guards 08/19/2020 / 1:25 p.m. - 2:15 p.m.

Nishinoshima - only a small degassing marks the volcano - snapshot 20.08.2020 Nasa Eosdis Worldview - one click to enlarge

Nishinoshima - only a small degassing marks the volcano - snapshot 20.08.2020 Nasa Eosdis Worldview - one click to enlarge

In Iceland, a huge flood, which carried glacial clay, swept over the west side of Langjökull on Monday August 17 in the afternoon and overnight.

The flood took a channel to the Svartá River, which is usually a dry river channel, which flows south of Hafursfell, and from there into the Hvítá River, above the confluence of the Hvítár and Geitá rivers, au- above Húsafell.

Flow meter variations in Kljáfoss - 08/17/2020 via Skessuhorn


According to a flow meter at Kljáfoss by Hurðarbakur, the river's flow nearly tripled from 95 cubic meters per second by midday Monday to 257 cubic meters when the debacle peaked at 2 a.m. on Tuesday evening. . The river returned to a flow of over 80 cubic meters around noon yesterday, Tuesday. On the morning of August 18, the river was still the color of cement again and you could see mud and sand on its banks in many places. Salmon were found dead, covered with clay matrix.

View of Langjökull from Hraunfoss Falls in Borgarfjöður - Archives 2016 © Bernard Duyck

View of Langjökull from Hraunfoss Falls in Borgarfjöður - Archives 2016 © Bernard Duyck

"Since 2004, we have not seen such summer flooding in Hvítá" , confirmed Kristjana G. Eyþórsdóttir, an expert in the water department of the Icelandic Meteorological Office / IMO, in a conversation with Skessuhorn.

An overflight attributed this flooding to the retreat / retreat of the Langjökull, with the formation of a new marginal reservoir which emptied while flowing towards the south.

 

Sources: Skessuhorn Vesturlands Fréttaveita - https://skessuhorn.is/

Langjökull - The new lagoon sits at the edge of the glacier in the gorge southeast of Hafursfell. - Photo Arnar Bergþórsson / 20.08.2020 - via Skessuhorn

Langjökull - The new lagoon sits at the edge of the glacier in the gorge southeast of Hafursfell. - Photo Arnar Bergþórsson / 20.08.2020 - via Skessuhorn

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Publié le par Bernard Duyck
Publié dans : #volcanic activity

At Sinabung, an eruption was observed on Wednesday August 19, 2020 at 12:54 a.m. WIB accompanied by an ash plume observed at ± 2000 m above the summit (± 4460 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 30 mm and a duration of 2344 seconds.

During the day, numerous emissions of steam, gas and ash are observed.

 Sinabung - 08/19/2020 / 01:37 - Magma Indonesia thermal webcam

Sinabung - 08/19/2020 / 01:37 - Magma Indonesia thermal webcam

Sinabung - 08/19/2020 / 11:02 am - photo Endro Rusharyanto

Sinabung - 08/19/2020 / 11:02 am - photo Endro Rusharyanto

Sinabung - steam jets, two-tone plumes of steam & gas and ash -19.08.2020 / 11:03 WIB - photo Endro Rusharyanto

Sinabung - steam jets, two-tone plumes of steam & gas and ash -19.08.2020 / 11:03 WIB - photo Endro Rusharyanto

Sinabung - steam jets, two-tone plumes of steam & gas and ash -19.08.2020 / 11.51 am WIB - photo Endro Rusharyanto

Sinabung - steam jets, two-tone plumes of steam & gas and ash -19.08.2020 / 11.51 am WIB - photo Endro Rusharyanto

Another eruption occurred on Wednesday August 19, 2020 at 6:23 p.m. WIB, accompanied by an ash plume observed at ± 4000 m above the summit (± 6460 m above sea level). The ash column was gray, with thick intensity, to the east and southeast. This eruption was recorded on a seismograph with a maximum amplitude of 100 mm and a duration of 708 seconds.

The seismicity of 19.08 consists of:

- 2 eruption earthquakes, with an amplitude of 30-100 mm, and the duration of the earthquake was 708-2344 seconds.

- 12 blast earthquakes, with an amplitude of 7 to 18 mm and the earthquake lasted 20 to 80 seconds.

- 40 low frequency earthquakes, with an amplitude of 2 to 15 mm and the duration of the earthquake was 6 to 25 seconds.

- 3 distant tectonic earthquakes, with an amplitude of 24-86 mm, S-P 16.6-90 seconds and a long earthquake of 70-944 seconds.

- 4 episodes of continuous tremor with an amplitude of 0.5-30 mm, dominant 10 mm.

 

Recommendations:

1. Communities and visitors / tourists should not conduct activities in 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 a sector radius of 5 km for the southeast sector and 4 km for the northeast sector.

2. In the event of ash rain, people are advised to wear masks when leaving the house to reduce the health effects of volcanic ash. Secure drinking water facilities and clean the roofs of houses from dense volcanic ash so that it does not collapse.

3. For people who live near the Sinabung drainages: stay aware of the dangers of lahars.

 

Sources: PVMBG, Magma Indonesia / Armen Putra

Thanks to Endro Rusharyanto for sharing photos.

Sinabung - eruption of 08/19/2020 / 6:26 p.m. WIB - Doc. Magma Indonesia

Sinabung - eruption of 08/19/2020 / 6:26 p.m. WIB - Doc. Magma Indonesia

Sinabung - ash falls on the surrounding houses and crops - photo 19.08.2020 / Nachelle Homestay

Sinabung - ash falls on the surrounding houses and crops - photo 19.08.2020 / Nachelle Homestay

"The blue Chebby on the volcano" - the photographer's horse - photo Endro Rusharyanto

"The blue Chebby on the volcano" - the photographer's horse - photo Endro Rusharyanto

The PVMBG reported that gray emissions rose 200m above the summit of Raung and drifted south from August 11-12.

The white plumes reached a height of 100 m and drifted north and south for a few days from August 13-18; weather conditions sometimes precluded visual observations.

The alert level remained at 2 (on a scale of 1 to 4) and the public was warned to stay outside the 2 km exclusion zone.

 

For August 18, the seismicity is characterized by:

- 57 blast earthquakes, with an amplitude of 1 to 7 mm and the duration of the earthquake was 34 to 81 seconds.

- 58 non-harmonic tremor episode, with an amplitude of 1 to 9 mm and the duration of the earthquake was 37 to 227 seconds.

- 1 local tectonic earthquake, with an amplitude of 8 mm, S-P 2.9 seconds and a long earthquake of 24 seconds.

- 5 distant tectonic earthquakes, with an amplitude of 2-6 mm, S-P 58-59 seconds and the duration of the earthquake 119-265 seconds.

 

Sources: PVMBG, Magma Indonesia, Global volcanism Program, Mirova.

Raung - hot spot in the crater on 08/18/2020 - image Sentinel-2 L1C bands 12,11,4 - one click to enlarge

Raung - hot spot in the crater on 08/18/2020 - image Sentinel-2 L1C bands 12,11,4 - one click to enlarge

Raung - seismicity at 19.08.2020 - Doc. Magma Indonesia - one click to enlarge

Raung - seismicity at 19.08.2020 - Doc. Magma Indonesia - one click to enlarge

Raung- thermal anomalies as of 2020.08.18 - Sentinel -2 bands 12.11.8A data / Mirova

Raung- thermal anomalies as of 2020.08.18 - Sentinel -2 bands 12.11.8A data / Mirova

This Wednesday August 19 at 02:30 local time (06:30 UTC), the monitoring stations installed near the Nevados de Chillán Volcanic Complex recorded an earthquake linked to the fracturing of rocks (Volcano-Tectonics).

The characteristics of the earthquake after its analysis are as follows:

- original time: 02:30 local time (06:30 UTC)

- depth: 3.7 km

- local magnitude: 3.8 (ML)

 

No surface activity associated with the reported event is observed. There is no report from neighboring communities on the perception of the earthquake.

Volcanic technical alert remains in Amarilla

 

Source: Sernageomin

Nevados de Chillan - photo archives Sernageomin

Nevados de Chillan - photo archives Sernageomin

At 06:42:00 local time on August 19, 2020, an eruption is recorded in the Rincon de la Vieja volcano, with a column that rises 500 meters above the height of the crater and 2416 meters asl.

Duration of activity: 2 minutes.

Seismic activity is similar compared to yesterday.

At the time of this report, the winds are blowing west.

The Rincon de la Vieja volcano continues with a slight eruptive activity. Seismicity shows a tremor in bands.

 

Source: Ovsicori

Rincon de La Vieja - 19.08.2020 / 6h42 - Doc. Ovsicori

Rincon de La Vieja - 19.08.2020 / 6h42 - Doc. Ovsicori

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Publié dans : #volcanic activity, #Sismologia
Suwanosejima - 17.08.2020 - image Sentinel-2 / EO browser / Copernicus

Suwanosejima - 17.08.2020 - image Sentinel-2 / EO browser / Copernicus

A small explosion occurred on August 17 in Suwanosejima, in the Ryulyu volcanic arc. According to reports, ash emissions reached up to 2,133 m above sea level.

An eruption was reported by the JMA on August 18, 2020 around 8 p.m. at Suwanosejima; it was accompanied by a plume of gas and ash which rose to 1,200 meters above the crater, then dissipated towards the south

Source: JMA & Copernicus / Sentinel-2

Suwanosejima - eruptive plume on 08/18/2020 / 8 p.m. - JMA webcams

Suwanosejima - eruptive plume on 08/18/2020 / 8 p.m. - JMA webcams

The main plume of the crater, white and gray, with a moderate to thick intensity, is observed this August 18 at about 2000 meters from the summit of Sinabung.

At the level of seismicity, we distinguish :

- 6 blast earthquakes, with an amplitude of 12 to 45 mm and a duration of 22 to 73 seconds.

- 32 low frequency earthquakes, with an amplitude of 2 to 15 mm, and the duration of the earthquake was 7 to 16 seconds.

- 4 local tectonic earthquakes, with an amplitude of 4-34 mm, S-P 1.6-3 seconds and a long earthquake of 11-29 seconds.

- 3 distant tectonic earthquakes, with an amplitude of 5-13 mm, S-P 28.4-31 seconds and a long earthquake of 86-696 seconds.

- 4 episodes of continuous tremor with an amplitude of 0.5 to 60 mm, dominating 10 mm.

 

The activity level is at 3 / siaga, with a red aviation code.

 

Sources: PVMBG, Magma Indonesia and VAAC Darwin.

Sinabung - 18.08.2020 - ash plume 2,000 meters above the summit - photo Sadrah Peranginangin

Sinabung - 18.08.2020 - ash plume 2,000 meters above the summit - photo Sadrah Peranginangin

Sinabung - time-lapse 18.08.2020 - Doc. PVMBG via Volcano YT

Two violent earthquakes off Bengkulu rocked the Indonesian island of Sumatra. The 6.8 and 6.9 magnitude earthquakes occurred at 5:23 a.m. local / 10:23 p.m. GMT and 5:29 a.m. local / 10:29 p.m. GMT on August 18, 2020, as reported by monitoring stations.

No tsunami warning has been issued, nor an assessment of the damage caused by these earthquakes.

They have to do with the subduction of the Indo-Australian plate under the Sunda plate.

 Strong earthquakes off Bengkulu / Sumatra - 08/18/2020 - Doc. Temblor

Strong earthquakes off Bengkulu / Sumatra - 08/18/2020 - Doc. Temblor

The Manna seismic station, south of Bengkulu, recorded 2 earthquakes of M greater than 6 on 08/18/2020.

The Manna seismic station, south of Bengkulu, recorded 2 earthquakes of M greater than 6 on 08/18/2020.

An earthquake of M 6.6 struck Masbate Island on August 18, 2020 at 8:30 a.m. local / 12:03 a.m. GMT in the Philippines. It was followed by strong aftershocks.

We deplore one death and dozens of wounded; much damage to homes is due to its shallow depth and power.

The origin is tectonic.

 

Sources: USGS Earthquake Hazards - EMSC - Local Observatory

 Philippines / Masbate region - damage to homes on 08/18/2020 - photo Philippine Red Cross Masbate

Philippines / Masbate region - damage to homes on 08/18/2020 - photo Philippine Red Cross Masbate

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 Sinabung - ash emissions on 08/17/2020 / 1:41 p.m. WIB - photo Endro Rusharyanto

 Sinabung - ash emissions on 08/17/2020 / 1:41 p.m. WIB - photo Endro Rusharyanto

Monday August 17, 2020 at 5:24 p.m. WIB, an eruptive episode occurred at Sinabung, accompanied by a plume observed at ± 1500 m above the summit (± 3960 m above sea level). This eruption was recorded on a seismograph with a maximum amplitude of 20 mm and a duration of 381 seconds.

Further ash emissions occurred during the day, with gray to brown plumes, about 800 meters above the summit.

The seismicity of 17.08 is characterized by:

- an eruption earthquake with an amplitude of 20 mm, and a duration of 381 seconds.

- 19 blast earthquakes with an amplitude of 7 to 86 mm and a duration of between 11 to 85 seconds.

- 4 episodes of continuous tremor with an amplitude of 0.5-25 mm, dominant 8 mm.

The activity level remains at 3 / siaga, with a red aviation code.

Ash emissions continue on August 18.

 

Sources: PVMBG & Magma Indonesia, photo Endro Rusharyanto

Sinabung - seismicity as of 08/17/2020 - Doc. Magma Indonesia - un clic pour agrandir

Sinabung - seismicity as of 08/17/2020 - Doc. Magma Indonesia - un clic pour agrandir

The Geophysical Institute of Peru (IGP) reports that the eruptive activity of the Sabancaya volcano remained at moderate levels between August 10 and August 16, with the continuous recording of explosions (an average of 17 daily explosions, low to medium) with plumes up to 2.5 km high at the top of the volcano and the consequent emission of ash and gas.

Sabancaya - summary table of activity from 10 to 16.08.2020 - Doc. I.G. Peru

Sabancaya - summary table of activity from 10 to 16.08.2020 - Doc. I.G. Peru

The IGP recorded and analyzed the occurrence of 1021 earthquakes of volcanic origin, associated with the circulation of magmatic fluids inside the Sabancaya volcano.

Volcano-Tectonic (VT) earthquakes were located mainly 12 km north of Sabancaya. The most significant seismic activity was recorded on August 14, represented in a swarm of earthquakes with magnitudes between M1.7 and M4.5. The largest earthquake, reported by the National Seismic Center (CENSIS), occurred at 3:34 p.m. at a depth of 13 km.

Slight inflation was recorded due to stations located in the northern sector of Hualca Hualca, and on the southeast flank of the Sabancaya volcano.

Three thermal anomalies were identified by satellite, with values ​​between 2 MW and 4 MW, associated with the presence of a lava body on the surface of the volcano's crater.

The volcanic alert remains orange, with an area of ​​12 km radius not recommended.

 

Source: I.G. Peru

Manam - 17.08.2020 - Sentinel -2 L1C bands 12,11,4 - one click to enlarge

Manam - 17.08.2020 - Sentinel -2 L1C bands 12,11,4 - one click to enlarge

In Papua New Guinea, weak thermal anomalies still mark the summit vents of Manam, with a VRP of 12 MW and 33 MW, respectively on August 16 / 12:40 p.m. and August 17 / 1:05 a.m.

The Sentinel-2 image of 17.08.2020 shows the two vents, and a bluish degassing (sulfur dioxide) at the north vent.

 

Sources: Mirova & Sentinel-2

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A small explosion occurred on August 16 in Nishinoshima, visible in a NASA image.

The VAAC Tokyo reports the continuation of the ash emissions, up to an altitude of flight 130.

 

Sources: Nasa Eosdis worldview, VAAC Tokyo

Nishinoshima - explosion of 08/16/2020 / Nasa eosdis worldview - one click to enlarge

Nishinoshima - explosion of 08/16/2020 / Nasa eosdis worldview - one click to enlarge

Nishinoshima eruptive plume - photo from plane by @ DOi2w / 08.16.2020

Nishinoshima eruptive plume - photo from plane by @ DOi2w / 08.16.2020

Nishinoshima - Volcanic ash advisory for 16 and 17.08.2020 - Doc. VAAC Tokyp - one click to enlarge thumbnailsNishinoshima - Volcanic ash advisory for 16 and 17.08.2020 - Doc. VAAC Tokyp - one click to enlarge thumbnails

Nishinoshima - Volcanic ash advisory for 16 and 17.08.2020 - Doc. VAAC Tokyp - one click to enlarge thumbnails

Sinabung, on Sumatra remains in activity level 2 / siaga, with a red aviation code.

VAAC Darwin reported ash emissions at flight altitude 150, in a southwesterly direction.

Magma Indonesia provides information for the seismicity of August 16:

- 3 blast earthquakes, with an amplitude of 2 to 5 mm and the earthquake lasted 15 to 65 seconds.

- 4 low frequency earthquakes with an amplitude of 2 to 10 mm and the earthquake lasted 10 to 20 seconds.

- 1 deep volcanic earthquake with an amplitude of 11 mm, S-P 2.3 seconds and the duration of the earthquake was 9 seconds.

- 1 local tectonic earthquake with an amplitude of 9 mm, S-P 4.6 seconds and a long earthquake of 24 seconds.

- 2 distant tectonic earthquakes with an amplitude of 6-7 mm, S-P 13-41 seconds and a long earthquake of 105-110 seconds.

- 4 episodes of continuous tremor with an amplitude of 0.5-16 mm, dominating 4 mm.


 

Sources: PVMBG, Magma Indonesia, VAAC Darwin

We wish a happy 75th anniversary of Independence to the Indonesians.

Sinabung - photo via Awel Ordne 08/16/2020

Sinabung - photo via Awel Ordne 08/16/2020

The sequence of volcanic earthquakes that began on Saturday August 15, 2020 at 2:47 a.m. local time (Saturday August 15, 2020 at 6:47 a.m. UTC *) in the volcanic aera of La Soufrière of ​​Guadeloupe continues.

Since the start of this sequence, the OVSG-IPGP networks have recorded 372 very low magnitude earthquakes (M <1). No earthquakes were reported felt. The events are located at a depth of <2.5 km below the top of the dome of La Soufrière.

The alert level remains: yellow, vigilance.

 

Source: OVSG

La Soufrière of Guadeloupe - photo archives France 3.fr

La Soufrière of Guadeloupe - photo archives France 3.fr

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 Nishinoshima - SAR intensity images from August 14, 2020 (left) and July 31, 2020 (right) - Doc. GSI - one click to enlarge

 Nishinoshima - SAR intensity images from August 14, 2020 (left) and July 31, 2020 (right) - Doc. GSI - one click to enlarge

The GSI has uploaded the SAR intensity images of the Daichi-2 satellite taken of Nishinoshima between July 31 and August 14, 2020.

The interference zones are considerably reduced over almost the entire surface of the island, covered with ash.

The image taken on August 14 shows an expansion of the pyroclastic cone crater.

This August 15, gas and ash emissions continue, with the emission of a plume in a southwesterly direction, dissipating in a western sector.

 

Sources: GSI, VAAC Tokyo & Nasa worldview

GSI Croissance de Nishinoshima capturée par Daichi n ° 2

Nishinoshima - Nasa Eosdis Worldview image from 08/15/2020 one click to enlarge

Nishinoshima - Nasa Eosdis Worldview image from 08/15/2020 one click to enlarge

The National Institute of Geophysics and Volcanology announces that on the morning of August 14, an increase in Strombolian activity is observed at the NSEC / New south-eastern crater (saddle cone) of Etna; it fuels an ash emission which generates a dark plume of ash dispersed by the wind in a south-southeast direction and with ash falls in the region of Pedara, Trecastagni and Viagrande.

The plume height reaches between 700 and 1,200 meters above the summit, justifying the passage of the aviation code from orange to red.

The fall of coarse pyroclastic material on the sides of the NSEC cone is reported by ground crews. This explosive activity is characterized by persistence and fluctuation in intensity and is associated with modest ash emissions.

From a seismic point of view, the amplitude of the tremor shows variations in the range of average values ​​and, sometimes, in that of high values. The location of the source of the quake is confined to the area of ​​the new south-eastern crater, at an altitude of 2900-3000 m above sea level. From an infrasound point of view, no significant activity is reported.

From the observation of the parameters relating to the deformations of the ground, no significant change was detected.

 

Source: INGV OE

Etna, seen from Santa Venerina - ash plume from 08/14/2020 - Photo by Mario Mattia (INGV-OE).

Etna, seen from Santa Venerina - ash plume from 08/14/2020 - Photo by Mario Mattia (INGV-OE).

The activity of Sinabung, in level 3 / siaga, continues with five eruptive episodes reported on August 14, 2020 by Magma Indonesia:

 

- Friday August 14, 2020 at 10:30 am WIB, with an ash plume observed at ± 2100 m above the summit (± 4560 m above sea level). The ash column was gray with moderate intensity to the southeast and south. This eruption was recorded on a seismograph with a maximum amplitude of 64 mm and a duration of 100 seconds.

- Friday August 14, 2020 at 2:25 p.m. WIB, with an ash plume observed at ± 1500 m above the summit (± 3960 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 68 mm and a duration of 229 seconds.

- Friday August 14, 2020 at 2:55 p.m. WIB. No visual observations were made. This eruption was recorded on a seismograph with a maximum amplitude of 90 mm and a duration of 62 seconds

 Sinabung - 08/04/2020 / 12:15 p.m. - Magma Indonesia

Sinabung - 08/04/2020 / 12:15 p.m. - Magma Indonesia

- Friday August 14, 2020 at 4:56 p.m. WIB with an ash plume observed ± 4200 m above the summit (± 6660 m above sea level). We observe that the ash column is gray to brown in color with a thick intensity towards the east. This eruption was recorded on a seismograph with a maximum amplitude of 40 mm and a duration of 580 seconds.

- Friday August 14, 2020 at 11:00 p.m. WIB with the observed height of the ash column ± 1000 m above the summit (± 3460 m above sea level). The ash column was observed to be gray with moderate to thick intensity towards the south. This eruption was recorded on a seismograph with a maximum amplitude of 88 mm and a duration of 387 seconds.

 

Note that on the images of the last two episodes, we can see small pyroclastic flows.

 

Source: Magma Indonesia - reports by Deri Al Hidayat and Armen Putra

Sinabung - plume of 08/14/2020 / 5:03 p.m. - note a small pyroclastic flow - Magma Indonesia

Sinabung - plume of 08/14/2020 / 5:03 p.m. - note a small pyroclastic flow - Magma Indonesia

 Sinabung - 08/14/2020 / 11:24 pm - cam FLIR Magma Indonesia

Sinabung - 08/14/2020 / 11:24 pm - cam FLIR Magma Indonesia

During the last 24 hours, 36 exhalations have been identified with Popocatépetl, some accompanied by volcanic gases and sometimes small amounts of ash.

In addition, 189 minutes of low amplitude tremor were recorded, most of it since a tremor episode that began on August 14 at 7:25 a.m., accompanied by an emission of ash from a height of 600 m above. above the crater; the ash emission then continued.

Ash falls are possible in my municipalities of Amecameca, Chalco, Atlautla, Ozumba, Cocotitlan and Tlalmanalco.

During the night, the volcano was partially visible, and a constant emission of volcanic gases and an incandescence above the crater could be observed.

 

The Popocatépetl remains on alert Amarilla Fase 2.

 

Sources: Cenapred, CNPC and webcams of Mexico

 Popocatépetl - emissions  from 08/14/2020 / 7:22 a.m. - WebcamsdeMexico

Popocatépetl - emissions from 08/14/2020 / 7:22 a.m. - WebcamsdeMexico

Popocatépetl - emissions  from 08/14/2020 / 8:38 am - WebcamsdeMexico

Popocatépetl - emissions from 08/14/2020 / 8:38 am - WebcamsdeMexico

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Publié le par Bernard Duyck
Publié dans : #volcanic activity
 Sinabung - eruptive episode of 08/14/2020 / 10:32 a.m. WIB - photo Magma Indonesia

 Sinabung - eruptive episode of 08/14/2020 / 10:32 a.m. WIB - photo Magma Indonesia

This Friday August 14, 2020 at 10:30 am WIB an ash plume was observed at ± 2100 m above the summit of Sinabung (± 4560 m above sea level). The ash column was gray, with moderate intensity to the southeast and south. This eruption was recorded on a seismograph with a maximum amplitude of 64 mm and a duration of 100 seconds.

Between 6 a.m. and 12 p.m. WIB, the seismicity consists of

- 1 eruption earthquake

- 5 blast earthquakes with an amplitude of 10 to 60 mm and the earthquake lasted 11 to 36 seconds.

- 1 episode of continuous tremor with an amplitude of 0.5 to 50 mm, dominant of 10 mm.

Sinabung - 08/14/2020 / 10:32 WIB - Ashes cover the surrounding countryside - photo Magma Indonesia

Sinabung - 08/14/2020 / 10:32 WIB - Ashes cover the surrounding countryside - photo Magma Indonesia

Sinabung - sismicité au 13.08.2020 - Doc. Magma Indonesia

Sinabung - sismicité au 13.08.2020 - Doc. Magma Indonesia

 Sinabung - eruptive episode of 08/13/2020 / 6:17 a.m. WIB - photo Magma Indonesia

Sinabung - eruptive episode of 08/13/2020 / 6:17 a.m. WIB - photo Magma Indonesia

The seven eruptive episodes of 08.13.2020, are detailed below by Armen Putra and Moh Nurul Asrori:

 

August 13, 2020, at 06:07 a.m. WIB: the height of the ash column is observed at ± 1000 m above the summit (± 3460 m above sea level). The ash column was gray with moderate intensity to the east, southeast and south. This eruption was recorded on a seismograph with a maximum amplitude of 15 mm and a duration of 719 seconds.

 

August 13, 2020, 08:02 WIB: The height of the ash column is observed at ± 1000 m above the peak (± 3460 m above sea level). The ash column was observed to be gray to black with moderate to thick intensity to the east and southeast. This eruption was recorded on a seismograph with a maximum amplitude of 18 mm and a duration of 496 seconds.

Sinabung - eruptive episode of 08/13/2020 / 8:43 a.m. WIB - photo Magma Indonesia

Sinabung - eruptive episode of 08/13/2020 / 8:43 a.m. WIB - photo Magma Indonesia

August 13, 2020, 08:31 WIB: The observed height of the ash column is ± 2000 m above the peak (± 4460 m above sea level). We observe that the ash column is gray to brown with moderate to thick intensity towards the east and southeast. This eruption was recorded on a seismograph with a maximum amplitude of 20 mm and a duration of 1035 seconds (17 min. 25 sec.)

 

August 13, 2020, 1:08 p.m. WIB: the height of the ash column is observed at ± 2000 m above the summit (± 4460 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 18 mm and a duration of 1247 seconds (nearly 21 min).

 Sinabung - eruptive episode of 08/13/2020 / 1:16 p.m. WIB - photo Magma Indonesia

Sinabung - eruptive episode of 08/13/2020 / 1:16 p.m. WIB - photo Magma Indonesia

The last three episodes could not be observed:

13 Agustus 2020, 3:41 p.m. WIB.

13 Agustus 2020, 8.15 p.m. WIB. No visual rash was observed. This eruption was recorded on a seismograph with a maximum amplitude of 70 mm and a duration of 3045 seconds (more than 50 min.).

13 Agustus 2020, 9:30 p.m. WIB.

 

The activity level remains at 3 / siaga.

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

- In the event of ash rain, people are advised to wear masks when leaving the house to reduce the health effects of volcanic ash. Secure drinking water facilities and clean the roofs of houses from dense volcanic ash so that it does not collapse.

- Communities that live near rivers that originate at Mount Sinabung to remain alert to the dangers of lahars.

 

Source: Magma Indonesia

Taal - Thermal anomalies at 08/14/2020 / 5:10 a.m. - Doc. Mirova _MODIS_Latest10NTI

Taal - Thermal anomalies at 08/14/2020 / 5:10 a.m. - Doc. Mirova _MODIS_Latest10NTI

In the past 24 hours, the Taal Volcano network has recorded three (3) volcanic earthquakes. Weak activity of steam or fumaroles rising 20 meters high before drifting northeast was observed from the vents in the main crater.

Mirova reported thermal anomalies on August 12 / 5:40 p.m. for 10 MW VRP, and on August 14 / 5:10 a.m. for 794 MW VRP (centered to the east of Taal Lake, of undetermined cause).   To be continued !

 

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 Taal Volcano Island (TVI).

 

Sources: Phivolcs & Mirova

Ebeko - 08/14/2020 / 07h26 seen from Severo Kurilsk - VOKKIA © KB GS RAS

Ebeko - 08/14/2020 / 07h26 seen from Severo Kurilsk - VOKKIA © KB GS RAS

A moderate explosive eruption continues in the Kurils, at Ebeko volcano.

According to visual data from volcanologists in Severo-Kurilsk, explosions sent ash up to 3 km above sea level on August 7, 9, 11 and 13; clouds of ash drifted west, east and south of the volcano; ash falls were noted in Severo-Kurilsk on August 9.

Satellite data showed a thermal anomaly on the volcano on August 7 and 10; the volcano was calm or obscured by clouds the other days of the week.

Aviation hazard prognosis: Moderate eruptive activity of the volcano continues. Ash explosions up to 19,700 feet (6 km) above sea level could occur at any time. Ongoing activities could affect low-flying planes and Severo-Kurilsk airport.

The aviation code remains orange

 

Source: VOKKIA

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Publié le par Bernard Duyck
Publié dans : #volcanic activity
Sinabung - the summit covered with ash 1 day after the eruptions - photo 11.08.2020 / Firdaus Surbakti / Komunitas Beidar Sinabung

Sinabung - the summit covered with ash 1 day after the eruptions - photo 11.08.2020 / Firdaus Surbakti / Komunitas Beidar Sinabung

Sinabung - the summit covered with ash 1 day after the eruptions, from another point of view - photo 11.08.2020 / Firdaus Surbakti / Komunitas Beidar Sinabung

Sinabung - the summit covered with ash 1 day after the eruptions, from another point of view - photo 11.08.2020 / Firdaus Surbakti / Komunitas Beidar Sinabung

At Sinabung, the summit is covered with ash, which whitens it, a day after the eruptions of August 10, and has many active vents (photos Firdaus Surbakti via Komunitas Beidar Sinabung).

The eruptive activity continues this August 13 with 3 eruptive episodes, accompanied by plumes of gas and ash at 1,000-2,000 meters above the summits, respectively at 6:07 am, 8:02 am and 8:31 am local time. Clouds cover the summit.

Sinabung - many active vents feature fumaroles - photo 11.08.2020 / Firdaus Surbakti / Komunitas Beidar Sinabung

Sinabung - many active vents feature fumaroles - photo 11.08.2020 / Firdaus Surbakti / Komunitas Beidar Sinabung

On August 12, the main plume of the crater was white and gray with fine to thick intensity about 100 meters from the peak. The weather is cloudy to rainy, with light to strong winds to the east, southeast and south.

Seismicity is characterized by:

- 13 blast earthquakes, with an amplitude of 3 to 33 mm and the earthquake lasted 20 to 71 seconds.

- 10 low frequency earthquakes with an amplitude of 3 to 9 mm and the duration of the earthquake was 10 to 25 seconds.

- 3 deep volcanic earthquakes with an amplitude of 16-55 mm, S-P 3.6-4 seconds and the duration of the earthquake 20-24 seconds.

- 1 distant tectonic earthquake with an amplitude of 5 mm, S-P 37 seconds and a long earthquake of 91 seconds.

- 4 episodes of continuous tremor with an amplitude of 0.5-7 mm, dominant at 2 mm.

 

Sources : Magma Indonesia and Firdaus Surbakti / Komunitas Beidar Sinabung

Nishinoshima - 13.08.2020 - ash and gas plumes, and the discolored water area - Doc. Nasa Eosdos Worldview

Nishinoshima - 13.08.2020 - ash and gas plumes, and the discolored water area - Doc. Nasa Eosdos Worldview

On Nishinoshima, the eruption continues, with the emission of a low ash plume and gas drifting towards the OSO. The discolored water area extending to the east.

Thermal anomalies range from moderate to low

 

Sources: Nasa worldview, Mirova and VAAC Tokyo

Nishinoshima - thermal anomalies at 08/13/2020 / 01:21 am - Doc. Mirova _MODIS_Latest10NTI

Nishinoshima - thermal anomalies at 08/13/2020 / 01:21 am - Doc. Mirova _MODIS_Latest10NTI

On Manam, in Papua New Guinea, two thermal anomalies, of VRP 12 and 9 MW are reported by Mirova on August 12, 2020.

Sentinel-2 images show a small white plume and a bluish gas plume, which stretches northwest, and drifts towards the main island.

 

Sources: Mirova and Sentinel-2

Manam - image Sentinel-2 L1C bands 12,11,4 from 12.08.2020 - one clicl to enlarge

Manam - image Sentinel-2 L1C bands 12,11,4 from 12.08.2020 - one clicl to enlarge

In Ethiopia, some thermal anomalies, moderate to low, have been noted at Erta Ale in recent days by Mirova.

Sentinel-2 / atmospheric penetration shows two hot spots.

 

Sources: Mirova & Sentinel-2

Erta Ale - hot spots - Sentinel-2 L1C bands 12.11 8A from 11.08.2020

Erta Ale - hot spots - Sentinel-2 L1C bands 12.11 8A from 11.08.2020

Erta Ale - thermal anomalies as of 12.08.2020 - Doc. Mirova - one click to enlarge
Erta Ale - thermal anomalies as of 12.08.2020 - Doc. Mirova - one click to enlarge

Erta Ale - thermal anomalies as of 12.08.2020 - Doc. Mirova - one click to enlarge

At Piton de La Fournaise, a field mission was carried out on the morning of August 12, by the OVPF teams, with the assistance of SAG and PGHM.

The first objective was the identification of potential new zones of destabilization and / or fractures on the sides of the volcano, following the last eruptions and subsidence ... no zone of weakening has been identified.

The second objective was to sample fumaroles and measure the temperature inside the Dolomieu crater. The results are awaited.

 

Source: OVPF

Piton de La Fournaise - GPS large slopes vertical and northeast movements between 02.01.2018 and 11.08.2020 - OVPF

Piton de La Fournaise - GPS large slopes vertical and northeast movements between 02.01.2018 and 11.08.2020 - OVPF

Piton de la Fournaise - 12.08.2020 - fumaroles sampling and temperature measurements inside the Dolomieu crater. - OVPF photo

Piton de la Fournaise - 12.08.2020 - fumaroles sampling and temperature measurements inside the Dolomieu crater. - OVPF photo

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