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