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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
 Erta Ale, southern pit-crater - photo Seifegebreil Shifferaw / Adventure & Volcanoes 02.12.2020

Erta Ale, southern pit-crater - photo Seifegebreil Shifferaw / Adventure & Volcanoes 02.12.2020

Erta Ale - thermal anomalies at 04.12. 2020 / 07h56 - Doc. Sentinel-2 Copernicus / Mirova

Erta Ale - thermal anomalies at 04.12. 2020 / 07h56 - Doc. Sentinel-2 Copernicus / Mirova

At Erta Ale, images from the Sentinel-2 satellite and the Mirova site show that the significant thermal anomaly, marking the southern pit crater on 29.11.2020, has weakened.

Seifegebreil Shifferaw and a local Adventure and Volcanoes team report that, during a field visit on December 2, they saw the expansion of the southern pit-crater, with a diameter of around 230 meters, and of a depth of about fifty meters. The crater is quite circular, with vertical walls, and the bottom covered with a layer of recent lava in cooling.
This December 4, Sentinel only allows you to see a weak hot spot.

Sources: Sentinel-1, Mirova and Seifegebreil Shifferaw

Erta ale - Sentinel-2 L1C bands images 12,11,4 from 04.12.2020 (above) and from 29.11.2020 (below) - one click to enlarge
Erta ale - Sentinel-2 L1C bands images 12,11,4 from 04.12.2020 (above) and from 29.11.2020 (below) - one click to enlarge

Erta ale - Sentinel-2 L1C bands images 12,11,4 from 04.12.2020 (above) and from 29.11.2020 (below) - one click to enlarge

The PVMBG reports for December 4, 2020 to Semeru:

- 19 eruption earthquakes, with an amplitude of 11 to 20 mm, and an earthquake duration between 34 to 165 seconds.

- 21 collapse / avalanche earthquakes

- 10 blast / emission earthquakes

- 4 episodes of Harmonic tremor

- 1 deep volcanic earthquake

- 1 distant tectonic earthquake.

 

Source: PVMBG

Semeru - glow of the dome and falling blocks on 04.12.2020 / 10.58 p.m. local - photo Øystein Lund Andersen

Semeru - glow of the dome and falling blocks on 04.12.2020 / 10.58 p.m. local - photo Øystein Lund Andersen

Semeru - seismicity at 04.12.2020 - Doc. Magma Indonesia

Semeru - seismicity at 04.12.2020 - Doc. Magma Indonesia

At Lewotolok, the summit plume was white and gray, thick and 100 to 1000 meters high above the summit on December 4. An eruption was observed at a height of 200-1000 meters above the summit, accompanied by a white / gray plume and a slight roar and incandescence, about 20 meters above the summit.

At night, incandescence is visible at the top.

Thanks to the seismographic records of December 4, 2020, it was recorded:

- 24 earthquakes of eruption

- 90 blast / emission earthquakes

- 15 episodes of non-harmonic tremor

- 2 deep volcanic earthquakes

- 2 distant tectonic earthquakes.

 

Source: PVMBG

Ili Lewotolok - activity of 05.12.2020 / 02:37 WITA - Doc. PVMBG

Ili Lewotolok - activity of 05.12.2020 / 02:37 WITA - Doc. PVMBG

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