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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
 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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