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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

Almost continuous Strombolian activity has been underway at the Southeast Crater, one of Etna's four summit craters since mid-July 2020. In particular, the site of this activity is the so-called "saddle cone" , which is located in place of the "deep saddle" which, until 2015, separated the old cone of the south-eastern crater from the new one (the "new south-eastern crater).

Although the activity is almost continuous, it fluctuates widely, with episodes of more intense activity every 4 to 10 hours. One of these episodes occurred on the evening of August 10, 2020 and lasted with variations in frequency and intensity of the explosions until the early hours of August 11, with bomb projections on the outer flanks of the cone.

A plume of gas and ash rises about 3,500 meters above the vent.

Note also an intense degassing with Voragine and Bocca Nuova.

 

Source: INGV-OE & Boris Behncke

Etna - thermal anomalies at 08/12/2020 / 01:05 am - Doc. Mirova_MODIS_Latest10NTI

Etna - thermal anomalies at 08/12/2020 / 01:05 am - Doc. Mirova_MODIS_Latest10NTI

Etna - the video was recorded at sunset and in the late evening of August 10, from the village of Tremestieri Etneo on the southern flank of the volcano, 20 km from its summit. Recordings made by Boris Behncke, INGV-Etneo Observatory.

News from three volcanoes in Ecuador: Sangay, Reventador and Tungurahua.

 

In Sangay, explosive activity is on the rise.

This August 11, 2020, the VAAC Washington reports an ash plume reaching an altitude of 5,800 meters (flight altitude 190)

The IGEPN informed, this August 12, of an increase in the number of explosions. They could be associated with light ash falls towards the southwest of the volcano, as the image of the GOES-16 satellite suggests.

The activity remains similar to that observed since May 2019, and qualified as superficially high and internal high / ascending.

 

Sources: IGEPN & VAAC Washington

Sangay and ash fallout this August 12 / 3h50 UTC - Doc. NOAA satellite GOES-16

Sangay and ash fallout this August 12 / 3h50 UTC - Doc. NOAA satellite GOES-16

At Reventador, a new lava flow is confirmed this August 10 on thermal images from the ECU-911 camera; it descends from the summit on the northeast flank, and its length is less than 200 meters.

The VAAC Washington reports a continuation of the explosive activity on August 11, and an ash plume that can reach 4,600 meters of altitude / alt. From flight 150.

 

Sources: IGEPN & VAAC Washington

Reventador - 08.10.2020 - the thermal signal of the short lava flow from the summit is superimposed on the trace of the previous still hot flows - Doc. IEPN

Reventador - 08.10.2020 - the thermal signal of the short lava flow from the summit is superimposed on the trace of the previous still hot flows - Doc. IEPN

Also in Ecuador, the IGEPN cameras made it possible to see a process of resuspension of ash on the western flank of the Tungurahua volcano.

This process is recorded from 08:00 TL on August 11, and is due to the dry climate and strong westerly wind, which are characteristic in this season of the year.

There is no change in the internal activity of the Tungurahua volcano.

Source: IGEPN

Tungurahua - resuspension of the ashes this 08/11/2020 / 12h53 UTC - IGEPN webcam

Tungurahua - resuspension of the ashes this 08/11/2020 / 12h53 UTC - IGEPN webcam

In Nishinoshima, explosive activity continues, with an ash plume estimated at an altitude of 4,000 meters / alt. Flight 130, by VAAC Tokyo.

On August 11, Nishinoshima was at the center of the cyclonic system formed in southern Japan by Tropical Storm SIX, weakened into a tropical depression while it carried the plume of ash and sulphate aerosols emitted by the current eruption.

 

Sources: VAAAC Tokyo, Himawari-8 satellite image and Nasa Eosdis worldview.

Nishinoshima - emissions from the volcano at the center of the SIX cyclonic system on 08.11.2020 / 3:00 p.m. - Doc. himawari8.nict.go.jp

Nishinoshima - emissions from the volcano at the center of the SIX cyclonic system on 08.11.2020 / 3:00 p.m. - Doc. himawari8.nict.go.jp

Nishinoshima - emissions from the volcano at the center of the SIX cyclonic system on 08.11.2020 - - Nasa Eosdis worldview snapshot

Nishinoshima - emissions from the volcano at the center of the SIX cyclonic system on 08.11.2020 - - Nasa Eosdis worldview snapshot

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