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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 : #Actualités volcaniques
Great Sitkin's plume seen from Adak 40 km on 19,11,2017 / 12:44 - photo Alain Beauparlant / AVO

Great Sitkin's plume seen from Adak 40 km on 19,11,2017 / 12:44 - photo Alain Beauparlant / AVO

A bit of instability characterizes the Great Sitkin in the Aleutian arc: an increase in seismicity in recent months and recent observation of a vigorous plume of steam motivated the AVO to increase the level of alert to Advisory and aviation code in Yellow.
On November 19, the slightly colored vapor plume rose 300 meters above the vent zone and extended 15-20 km to the south.
Its last activity dates back to 1974, characterized by a plume that reached 7,600 meters asl. and a lava flow that covered 600,000m² of the summit crater floor.


Source: AVO

Eruption of the Great Sitkin 19.02.1974 - photo Steve Kelly AVO

Eruption of the Great Sitkin 19.02.1974 - photo Steve Kelly AVO

At Agung, the seismicity remains low and a plume of white vapor rises 100-400 meters above the crater. The alert level remains at III.


Sources: PVMBG & Magma Indonesia

 Agung 23.11.2017 / 11:56 WITA - the white vapor plume merges with the clouds - photo Magma Indonesia

 Agung 23.11.2017 / 11:56 WITA - the white vapor plume merges with the clouds - photo Magma Indonesia

The GVP reports, via SVERT, low steam and gas emissions at Sarychev peak / Kuriles archipelago on 13 November. The volcano was not observable between 14 and 20 November, under the clouds.
The aviation code remains green.
To note: a thermal anomaly was spotted by Mirova Modis on November 7 and 8, 2017, confirmed by the images of the satellite Sentinel2, which show a gas plume and traces of a lava flow from the top of the volcano on the flank NSN.


Sources: Sakhalin Volcanic Response Team Eruption (SVERT) & Mirova

 The Sarychev - image Sentinel2 12-11-3 bands on 07.11.2017

The Sarychev - image Sentinel2 12-11-3 bands on 07.11.2017

 Sarychev - Thermal anomaly of 7-8.11.2017 - Doc.Mirova Modis

Sarychev - Thermal anomaly of 7-8.11.2017 - Doc.Mirova Modis

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