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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
Langila - last period of activity - photo 25.-27.05.2018 / David Gorman - Instagram

Langila - last period of activity - photo 25.-27.05.2018 / David Gorman - Instagram

In Papua New Guinea, the Langila presented, on the basis of satellite images, ash plumes between 1 ° and 3 August, which reached an altitude of 2-4 km, drifting north-west and the west.

On August 3, a thermal anomaly was observed.

After August 3, the ash plumes were more diluted, reaching 1.8 km asl and drifting to the northwest.

The last period of activity dates back between April 2, 2016 and October 30, 2018, from VEI 2 (GVP)

 

Sources: VAAC Darwin, via G.V.P.

Nevados de Chillan - from top to bottom, and from left to right, the photos of the summit and the lava flows respectively on 29.07, 01.08 and 03.08.2020 - WebcamSernageomin Portezuelo - one click to enlargeNevados de Chillan - from top to bottom, and from left to right, the photos of the summit and the lava flows respectively on 29.07, 01.08 and 03.08.2020 - WebcamSernageomin Portezuelo - one click to enlarge
Nevados de Chillan - from top to bottom, and from left to right, the photos of the summit and the lava flows respectively on 29.07, 01.08 and 03.08.2020 - WebcamSernageomin Portezuelo - one click to enlarge

Nevados de Chillan - from top to bottom, and from left to right, the photos of the summit and the lava flows respectively on 29.07, 01.08 and 03.08.2020 - WebcamSernageomin Portezuelo - one click to enlarge

In Chile, the main lava flow of Nevados de Chillan lengthened sharply between July 13 and August 3, according to images captured by the Portezuelo webcam.

Since the beginning of August, the snow on the summit has been soiled by ash.

 

Source: webcam Sernageomi Portezuelo

Nishinoshima - strong SO2 signal near the volcano - Sentinel-5P / Tropomi / DLR / BIRA / ESA image

Nishinoshima - strong SO2 signal near the volcano - Sentinel-5P / Tropomi / DLR / BIRA / ESA image

Nishinoshima - volcanis ash advisory for 06.08.2020 - Doc. VAAC Tokyo

Nishinoshima - volcanis ash advisory for 06.08.2020 - Doc. VAAC Tokyo

Activity remains on Nishinoshima, where VAAC Tokyo reports ash plumes reaching up to 5,800 meters in early August. Their dispersion takes place in multiple directions.

The Sentinel-5P / Tropomi Satellite still reports strong signals of sulfur dioxide around Nishinoshima, with this August 06, 98.45Du of SO2 at an altitude of 6 km.

 

Sources: VAAC Tokyo and Sentinel-5P Tropomi

Merapi - summit and dome on 08/06/2020 / 11:30 am - iùage Volcano YT i Frekom

Merapi - summit and dome on 08/06/2020 / 11:30 am - iùage Volcano YT i Frekom

Merapi - activity summary table of 05.08.2020 - Doc. BPPTKG

Merapi - activity summary table of 05.08.2020 - Doc. BPPTKG

In Merapi, on Java, the seismic activity of this August 5 is declined in:

- 3 collapse earthquakes, with an amplitude of 3 to 35 mm and a duration of 10 to 18.4 seconds from the earthquake. The sliding distance and the direction of the fall are not indicated.

- 10 hybrid earthquakes, with an amplitude of 2-11 mm, S-P 0.2-0.41 seconds and an earthquake duration of 5-7.68 seconds.

- 3 shallow volcanic earthquakes, with an amplitude of 35 to 65 mm and an earthquake duration of 9 to 29 seconds.

- 2 distant tectonic earthquakes.

 

The activity level remains at 2 / waspada, with a forbidden zone of 3km radius around the summit. The main potential danger is linked to pyroclastic flows associated with the collapses of the lava dome and falling materials during explosions.

 

Sources: Magma Indonesia, BPPTKG and Volcano YT i Frekom

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