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Earth of fire

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

Publié le par Bernard Duyck
Publié dans : #volcanic activity
  Merapi - explosion on 03.03.2020 / 05h22 - photo PGM Baradan

 Merapi - explosion on 03.03.2020 / 05h22 - photo PGM Baradan

A strong explosive eruption occurred in Merapi / Java, this March 3 at 5:22 am local; it was accompanied by a plume of ash reaching 6,000 meters and pyroclastic flows over two kilometers on various sides. The eruption lasted 450 seconds.

The noise of the explosion was perceived up to 30 km from the Merapi for at least five minutes

Villagers living on its fertile slopes are advised to stand at least 3 km from the crater, as ash fallout is expected within 10 km, mainly on the north side.

VAAC Darwin has issued a red aviation code.

 

Sources: BPPTKG, Magma Indonesia and VAAC Darwin

 Merapi - seismogram of 03.03.2020 - Doc.Magma Indonesia

Merapi - seismogram of 03.03.2020 - Doc.Magma Indonesia

 Merapi - ash cloud spotted 03.03.2020 / 07h WIB (circled in yellow) by RGB Citra Himawari

 Merapi - ash cloud spotted 03.03.2020 / 07h WIB (circled in yellow) by RGB Citra Himawari

Merapi Eruption - 3/03/2020 05:26:52 WIB (fullscreen) (via klangon)

In Semeru, the PVMBG reports for March 2,

- 18 eruption earthquakes with an amplitude of 10-22 mm, and the duration of the earthquake of 65-200 seconds.

- 1 avalanche earthquake, with an amplitude of 7 mm and a duration of 175 seconds. The sliding distance and the direction of fall are not observed.

- 5 blast earthquakes with an amplitude of 4 to 6 mm and a duration of 60 to 76 seconds.

- 10 episodes of harmonic tremor with an amplitude of 3 to 10 mm and a duration of 130 to 345 seconds.

 

The plume emitted is white, raised about 50-100 meters from the summit. The weather is sunny to rainy, the winds are light to moderate to the northeast, east and south.

Semeru - 29.02.2020 - https // www.instagram.comp / B9Jj7Ipl0sq, via Sherine France

Semeru - 29.02.2020 - https // www.instagram.comp / B9Jj7Ipl0sq, via Sherine France

The seismicity of March 1 was characterized by

- 49 eruption earthquakes with an amplitude of 11-25 mm, and a duration of 45-130 seconds.

- 14 avalanche earthquakes, with an amplitude of 4-12 mm and a duration of 50-135 seconds. The sliding distance and the direction of fall are not observed.

- 6 episodes of harmonic tremor, with an amplitude of 4 to 12 mm and a duration of 115 to 3600 seconds.

 

The activity of Semeru is still at level 2 / waspada but in recent days, the lava which descends from the crater more frequently and more significantly than usual. The plume that surmounts the summit is constant.

 

Sources: PVMBG & Magma Indonesia

Nishinoshima - morphological changes in the coastline (west and east) since February - Doc. GSI

Nishinoshima - morphological changes in the coastline (west and east) since February - Doc. GSI

Nishinoshima - SAR intensity image of February 28, 2020. The light blue line indicates the area where a change in terrain was observed from January 31, 2020 to February 14, 2020, and the red line indicates the area where a change in terrain was observed observed later.

Nishinoshima - SAR intensity image of February 28, 2020. The light blue line indicates the area where a change in terrain was observed from January 31, 2020 to February 14, 2020, and the red line indicates the area where a change in terrain was observed observed later.

On Nishinoshima, in the Ogasawara Islands, thanks to SAR intensity images from the GSI site, topographic changes due to lava are observed on the north and east sides of the pyroclastic cone, and changes in the coastline are observed on the side north of the island.

In addition, a new topographic change is observed on the southwest side of the pyroclastic cone, which would be caused by lava.

The thermal anomalies transmitted by Mirova between February 29 and March 2 range from 47 MW on March 1 / 4:15 a.m. and 338 MW on March 2 / 12:45 p.m.

 

Sources: Geological Survey of Japan & Mirova / Thanks to sherine France for sharing

Nishinoshima - thermal anomalies on 02.03.2020 / 12:45 pm Nishinoshima_MODIS_logVRP

Nishinoshima - thermal anomalies on 02.03.2020 / 12:45 pm Nishinoshima_MODIS_logVRP

Вулкан Ключевской. Пепловые выбросы на высоту ~7 км над уровнем моря. 2020-03-02 03:00-04:00 UTC.

In the video, the eruption of the Klyuchevskoy volcano on March 2, 2020 03:00 - 04:00 UTC (local time on March 2, 15:00 - 16:00). The ash plume rose approximately 10 km above sea level and then spread in a north-easterly direction. Shooting with an IP video camera installed in a seismic station at the foot of the Bezymyanny volcano (~ 7 km southeast of the volcano). Doc. from the FIC EGS RAS (http://emsd.ru/).

Reykjanes peninsula - location and magnitude of earthquakes at 03.03.2020 / 8.45 am - Doc. IMO
Reykjanes peninsula - location and magnitude of earthquakes at 03.03.2020 / 8.45 am - Doc. IMO

Reykjanes peninsula - location and magnitude of earthquakes at 03.03.2020 / 8.45 am - Doc. IMO

In the Reykjanes Peninsula, the seismic swarm that has been going on in Reykjanestá since February 15 is slowly declining. Since then, around 700 earthquakes have been detected in the region.

At 6:58 p.m. yesterday evening, an M2.5 earthquake was detected near Kleifarvatn.

IMO warns against cave excursions in the Eldvörp region on the Reykjanes peninsula. Dangerous levels of CO2 and low levels of O2 have been measured there recently, in a cave near a parking lot very popular with hikers.

Seismic activity near Thorbjorn has decreased considerably recently. Uplift is no longer observed, which is likely due to the cessation of the influx of magma. The indications show a minor subsidence from mid-February but it is too early to interpret the data.
 

Source: IMO

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