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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
Davidof and Khvostof Islands - Photo archives AVO / courtesy of Roger Clifford. - one click to enlarge

Davidof and Khvostof Islands - Photo archives AVO / courtesy of Roger Clifford. - one click to enlarge

Over the past two days, a swarm of earthquakes has occurred near Davidof Volcano in the Aleutians. The largest earthquake in the current sequence occurred yesterday at 4:02 p.m. AKST (January 26, 01:02 UTC) and had a magnitude of 4.9. A similar earthquake swarm occurred in December 2021. No signs of unrest were seen in recent satellite images of the volcano.

This seismic activity may be associated with volcanic unrest or be due to regional tectonic activity. Due to the possibility of escalating volcanic unrest, AVO is raising the Aviation Color Code and Volcanic Alert Level for Davidof to Yellow/Advisory

AVO continues to monitor the situation with seismometers deployed on nearby islands as there is no real-time seismic monitoring network at Davidof Volcano. The nearest seismometers to Davidof are about 15 km east of the volcano on Little Sitkin Island.

 

Source: AVO-USGS

Galapagos / Isabela - Wolf volcano - sat GOES-16 false color of 26.01.2022 / 10:50 UTC - Doc. NOAA / CIMSS - one click to enlarge

Galapagos / Isabela - Wolf volcano - sat GOES-16 false color of 26.01.2022 / 10:50 UTC - Doc. NOAA / CIMSS - one click to enlarge

The IG reported that the eruption of Wolf Volcano in the Galapagos Islands continued from January 18-25. Daily thermal alerts numbered in the hundreds, centered on advancing lava flows on the SE flank.

Diffuse gas emissions were visible drifting SW from 18 to 20 January. The level of activity remained stable at the beginning of the week then began a downward trend from 21 January.
 

On January 26 / 11 a.m., the IG reports a large-period (LP) earthquake.

MIROVA records 3 high thermal anomalies, respectively of VRP 282, 887, 248, 27 & 127 MW during January 25 and 26; in the last 12 hours, Worldview records 43.

 

Sources: IGEPN & Global Volcanism Program

Wolf - Thermal anomalies on 27.01.2022 / 05:05 - Doc. Mirova_MODIS_Latest10NTI

Wolf - Thermal anomalies on 27.01.2022 / 05:05 - Doc. Mirova_MODIS_Latest10NTI

Wolf - Sentinel-5P / SO2 image as of 01.26.2022 / 7:09 p.m. - via Mounts project

Wolf - Sentinel-5P / SO2 image as of 01.26.2022 / 7:09 p.m. - via Mounts project

Ovsicori has issued a map of the extension and thickness of the deposits of the pyroclastic flow that occurred on January 17, 2022 at the Turrialba Volcano.

Its maximum range was 400 meters, for a deposit of 20 to 40 cm.

In the central crater and the lakes, the deposits are more important, probably due to erosion and sedimentation of materials between the reference flights of 2020 and January 18, 2022.

The active crater has widened from 2 to 10 meters.

 

Source: Ovsicori 25.01.2022

Turrialba - Explosion and pyroclastic flow of 01.17.2022 / 9:33 p.m. - Ovsicori webcam

Turrialba - Explosion and pyroclastic flow of 01.17.2022 / 9:33 p.m. - Ovsicori webcam

Turrialba - deposits of the pyroclastic flow and the crater on 18.01.2022 (dimensions of the lake with asterisks*) - drone view of Ovsicori

Turrialba - deposits of the pyroclastic flow and the crater on 18.01.2022 (dimensions of the lake with asterisks*) - drone view of Ovsicori

Turrialba - the edges of the crater clearly visible on 18.01.2022 - photo Sofia Angulo via Ovsicori

Turrialba - the edges of the crater clearly visible on 18.01.2022 - photo Sofia Angulo via Ovsicori

The peaks of the Canary Islands are covered in snow today, and the soils have turned from ash black to a white coat.

Due to the presence of very thick snow on the road, on the 26th, 27th and 28th we cut the LP-4 road at its accesses from Pico de la Nieve to Roque de los Muchachos, and its access from Hoya Grande, to Garafía , at Roque de los Muchachos in La Palma.

On January 26, 2022, the Sentinel 2 satellite of Copernicus EU took this impressive image of Teide, located on the island of Tenerife, in which the last snowfalls can be seen on its summit in a gap between the clouds which covered a much of the island.

 

Sources: Cabildo de La Palma & Copernicus

La Palma - road to Roque de los Muchachos - photo 26.01.2022 / Cabildo de La Palma - click to enlarge

La Palma - road to Roque de los Muchachos - photo 26.01.2022 / Cabildo de La Palma - click to enlarge

Tenerife - Teide - Sentinel-2 Copernicus image from 26.01.2022 - one click to enlarge

Tenerife - Teide - Sentinel-2 Copernicus image from 26.01.2022 - one click to enlarge

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