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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

AVO reports continued low level activity to Veniaminof.

Elevated surface temperatures are observed at the top cone and the sidewall vent.

Satellite observations reveal fresh ash deposits extending over about 10 km. south-east on the snow of the caldera.

Seismicity shows periods of repeated seismic events and tremor.

 

2021.03.26 - Veniaminof - RSAM VNFG, Last 24 hours, 5 minute average. - Doc. AVO

Back to the noises formed during the activity of March 23: the audible noises in the vicinity of the volcano are caused by the bursting of large pockets of gas with the active cone, in the case of typical Strombolian activity, characterizing basaltic volcanoes basalto-andesitic (see diagrams below)

 

Sources: AVO

Veniaminof - explanation of the origin of the explosion noises - Doc. AVO

Veniaminof - explanation of the origin of the explosion noises - Doc. AVO

The eruption continues in Geldingadalur, with low fountaining activity, no ash production, but significant gas releases.

The high gas levels required a press release from ISOR:

The outlook is for a prolonged eruption in Geldingadalur. This fact awaits us the unique opportunity to see an eruption with our own eyes. But we want you to be careful.
It has now become clear that the gas emissions from volcanoes are nothing like what we have seen before. There is an extremely dangerous and potent mixture of CO2 and CO, which are potentially lethal gases. Keep in mind that there are a lot of police and rescue workers at the eruption sites working to keep us safe.
They all have GAS METERS, when the gas meters start to whine, it is better to move at least 10m. higher than where they are. THEY HAVE GAS MASKS, not all of them. This message includes a table on gas resistance and the effects of volcanic gases rising up volcanoes.
"

Geldingadalgos - 25.03.2021 / 08:32 - Gas on the path to the observation - RUV webcam

Geldingadalgos - 25.03.2021 / 08:32 - Gas on the path to the observation - RUV webcam

A busy eruption site day and night - photos by Gunnar Freyr Gunnarsson and Andrei Menshenin - one click to enlargeA busy eruption site day and night - photos by Gunnar Freyr Gunnarsson and Andrei Menshenin - one click to enlarge

A busy eruption site day and night - photos by Gunnar Freyr Gunnarsson and Andrei Menshenin - one click to enlarge

The Suðurnes police decided to block access to the Geldingadalur eruption sites for the night of March 25-26, both because of the gases emitted, the bad atmospheric conditions ... and the lack of minimum equipment visitors.

According to the latest news from Kristin Jondsdottir / IMO, InSAR data suggests that the dyke is only shallow around the eruptive site, and that there is no indication of the presence of near-surface magma elsewhere along the dyke.

 

Sources: IMO, RUV, mbls, ISOR

Pacaya - image Sentinel-2 bands 12,11,5 of 25.03.2021 - Doc. Insivumeh

Pacaya - image Sentinel-2 bands 12,11,5 of 25.03.2021 - Doc. Insivumeh

In its bulletin of March 25 at 6 p.m. Local Insivumeh reports continuous activity in Pacaya, with moderate explosions accompanied by ash plumes at 3,500 m. asl., moving south-west, south-east, north and north-east over 15-20 km. and generating falling fine particles.

 

2021.03.25 6 p.m. loc. - Pacaya - RSAM - Doc. Insivumeh

The lava flow on the southwest flank reaches approximately 2,500 m. long, with a lava front 250 meters wide reaching the vegetation level, and starting fires and destroying coffee and avocado plants.

 

Sources: Insivumeh & Conred

Erta Ale - Sentinel image 12.11.8A NIR from 03.24.2021 / 07:36 a.m.
Erta Ale - Sentinel image 12.11.8A NIR from 03.24.2021 / 07:36 a.m.

Erta Ale - Sentinel image 12.11.8A NIR from 03.24.2021 / 07:36 a.m.

Fluctuating activity has been observed thanks to the Sentinel satellite in the Erta Ale caldera in Ethiopian Afar in recent days.

It was noticed at the south pit crater 5 days ago, and yesterday marked the two pit craters, with more activity at the north pit.

The thermal anomalies noted by Mirova oscillate between VRP 25 MW on March 23 and VRP 128 MW on March 25 / 08h a.m.

 

Sources: Sentinel-2 / Mounts project and communication from Seifegebreil Shifferaw.

Erta Ale - Doc. Sentinel-2 bands 12,11,8 & Modis thermal volcanic activivity / Mirova from 24.03.2021 / 07:56

Erta Ale - Doc. Sentinel-2 bands 12,11,8 & Modis thermal volcanic activivity / Mirova from 24.03.2021 / 07:56

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