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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

A series of explosions were observed at the Nevados de Chillan complex on May 2, 2021; they generated pyroclastic flows of collapse over 400 meters from the crater on the northeast flank and resulted in the partial destruction of the dome in the Nicanor crater.

On May 5, the extrusion of a new lava flow / L6 is mentioned, which has advanced 100 meters from the edge of the crater on the northeast flank. The measurements made with the thermal camera show a temperature of 278 ° C.

A new hot spot is measured in an area adjacent to the L5 casting, at 307 ° C.

This L5 flow on the north flank is fed by fresh material, and shows a temperature of 208 ° C.

Nevados de Chillan - L5 and L6 lava flows, and pyroclastic deposits - Doc. Sernageomin 05.05.2021

Nevados de Chillan - L5 and L6 lava flows, and pyroclastic deposits - Doc. Sernageomin 05.05.2021

Nevados de Chillan - temperatures recorded on 05.05.2021 - Thermal camera / Sernageomin

Nevados de Chillan - temperatures recorded on 05.05.2021 - Thermal camera / Sernageomin

At the same time, sulfur dioxide emissions have been sustained since March 2021, with maximum values ​​of 1,800 tonnes / day, point explosions, consistent with an increase in thermal anomalies of maximum VRP 29 MW.

The deformation data shows an inflation of max. 0.8 cm / month, observed since the end of March.

 Nevados de Chillan - 05.05.2021 / 14:43 - Sentinel-2 bands 12,11,8A & Modis thermal volcanic activity - Doc. Mirova

Nevados de Chillan - 05.05.2021 / 14:43 - Sentinel-2 bands 12,11,8A & Modis thermal volcanic activity - Doc. Mirova

The weather conditions on Wednesday May 5 allowed us to observe clearly eruptive activity, which is always characterized by ash explosions and lava extrusion.

In addition, a special volcanic activity report reports the occurrence of an energetic explosion, with a reduced displacement of 504 cm2, at 4:10 p.m. local time, which generated an eruptive column of about 320 m above the crater. The body maintains the YELLOW technical alert.

Nevados de Chillan - explosion and plume of ash / gas of 05.05.2021 / 4:10 p.m. - Sernageomin

 

Source: REAV Sernageomin

There was a slight change in the measurements of the seismic tremor at Fagradalsfjall on May 5 shortly before 4.30am. The rytm  was the same until then, with about 10 min between lava jets.

But on the morning of the 5th, about half an hour passed between powerful jets of lava. At 5:40 a.m., an unusually high lava fountain passed the frame of the RÚV webcam. It seems estimated at more than 460 m. (IMO on Twitter)

Because of the power of the fountains and the bombs ejected at great distance, the police of Suðurnes defined new zones of danger, enlarged in the event of wind higher than 15 m / s.

 Enlargement of the danger zone - Doc. 04.05.2021 Un. Iceland via police in Suðurnes - one click to enlarge

Enlargement of the danger zone - Doc. 04.05.2021 Un. Iceland via police in Suðurnes - one click to enlarge

Eruption of vent 5 / Fagradalsfjall - irregularities in the tremor of 05.05.2021 (to the right of the diagram) - Doc. IMO

Eruption of vent 5 / Fagradalsfjall - irregularities in the tremor of 05.05.2021 (to the right of the diagram) - Doc. IMO

 Geldingadalur - Lava fountain at more than 460 m on 05.05.2021 / 05:40 - RUV webcam

Geldingadalur - Lava fountain at more than 460 m on 05.05.2021 / 05:40 - RUV webcam

Reykjanes Peninsula - SO2 column after the large lava fountain on 05.05.2021 / 12:30 p.m.-12:31 p.m. UT - image Sentinel-5P Tropomi, via Simon Carn

Reykjanes Peninsula - SO2 column after the large lava fountain on 05.05.2021 / 12:30 p.m.-12:31 p.m. UT - image Sentinel-5P Tropomi, via Simon Carn

Incandescent materials landed in the foam southwest of the crater and started a fire there, emitting smoke.

The lava flow last week averaged 7.5 cubic meters per second. The throughput was slightly higher than last week but similar to the previous week. The Institute of Earth Sciences says there is no sign of the eruption giving way. (See settings in yesterday's article)

 

Sources: IMO, UN.Iceland, RUV, webcams RUV & langihryggur N

 Reykjanes Peninsula - the lava field relativized on the surface - image Sentinel-2 bands 12,11,8A from 04.05.2021 - one click to enlarge

Reykjanes Peninsula - the lava field relativized on the surface - image Sentinel-2 bands 12,11,8A from 04.05.2021 - one click to enlarge

Fagradalsfjalll - extent of lava flows and high temperature zones by Sentinel-2 on 04.05.2021, respectively in IR, in natural colors bands 4,3,2 and in bands 12,11,8A (as in the photo above) - one click to enlarge
Fagradalsfjalll - extent of lava flows and high temperature zones by Sentinel-2 on 04.05.2021, respectively in IR, in natural colors bands 4,3,2 and in bands 12,11,8A (as in the photo above) - one click to enlargeFagradalsfjalll - extent of lava flows and high temperature zones by Sentinel-2 on 04.05.2021, respectively in IR, in natural colors bands 4,3,2 and in bands 12,11,8A (as in the photo above) - one click to enlarge

Fagradalsfjalll - extent of lava flows and high temperature zones by Sentinel-2 on 04.05.2021, respectively in IR, in natural colors bands 4,3,2 and in bands 12,11,8A (as in the photo above) - one click to enlarge

Activity continues in Geldingadalur with smaller lava fountains - webcam_langihryggur N 05.05.2021 / 10.30am

Activity continues in Geldingadalur with smaller lava fountains - webcam_langihryggur N 05.05.2021 / 10.30am

Video to read while it remains online, showing the morphological variations of the south-eastern crater of Etna

- 1st game since December 2020

- 2nd part: from 2010 to the present day.

Doc. Passione Etna / Antonio di Luca

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