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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
La Palma / Cumbre Vieja - activity from 25.10.2021 - Imagen Magaly Cáceres (RTVC)

La Palma / Cumbre Vieja - activity from 25.10.2021 - Imagen Magaly Cáceres (RTVC)

The technical director of PEVOLCA reported that the reconfiguration of the Cumbre Vieja cone continues, with the emission of a large quantity of lava, especially towards the west, on the original flow and on that which passes above of the Todoque mountain. This large contribution of lava also filled some areas that remained as islands between the flows, as is the case with Alcalá. The lava channels remain active, feeding these flows and the lava delta.

The La Laguna lava flow does not undergo significant changes and, like the rest of the lava flows, its course continues to be monitored in the event that further civil protection measures are required. The same goes for the one that runs along the cliff towards Perdido beach, which remains about 110 meters from the sea.

La Palma / Cumbre Vieja - the summit cone on 25.10.2021 / 15:15 - videoCabildo de Canarias.

The spokesperson for the scientific committee and director of the National Geological Institute (IGN) of the Canary Islands, María José Blanco, stressed that the current level of seismicity continues to indicate that it is possible for more earthquakes to be felt can be produced, being able to reach intensities VI (EMS) and cause small landslides in sloping areas. Depending on the evolution of the number of events, depth and magnitude, there is a greater probability of earthquakes of intensity VI.

Seismicity between 10 and 15 km increased very noticeably yesterday, being the highest rate of seismic energy release. Regarding earthquakes located at depths greater than 20 km, they continue to have a high magnitude. In addition, yesterday there were notable amplitudes in the tremor signal, the highest in a month.

La Palma - seismicity at 26.10.2021 / 06:25 - Doc. IGNes

La Palma - seismicity at 26.10.2021 / 06:25 - Doc. IGNes

The buildings destroyed or damaged, according to the data provided by the Land Registry, are estimated at 1,287 buildings, including 1,036 for residential use, 133 for agricultural use, 64 for industrial use, 30 for leisure and hospitality use, 11 for public use and 14 for other uses. .

The number of people accommodated in hotel centers is currently 453. Of these, 63 are in a hotel center in Los Llanos de Aridane and 390 in a hotel in Fuencaliente.

La Palma / Cumbre Vieja from S. Nicolás Road - Gaa and ash plume of 25.10.2021 / 11:15 am loc. - photo InVolcan

La Palma / Cumbre Vieja from S. Nicolás Road - Gaa and ash plume of 25.10.2021 / 11:15 am loc. - photo InVolcan

La Palma / Cumbre Vieja - collapse and consecutive sinks on 25.10.2021 / 8 p.m. - photo InVolcan

La Palma / Cumbre Vieja - collapse and consecutive sinks on 25.10.2021 / 8 p.m. - photo InVolcan

During October 24, the emission of sulfur dioxide (SO2) associated with the volcanic plume (visible emanations of volcanic gases) continues to record high values ​​in line with the eruptive process, reaching values ​​of 53,600 tons per day ( underestimated value).

Likewise, the diffuse emission of carbon dioxide (CO2), associated with the 220 km2 of the volcanic ridge of Cumbre Vieja (non-visible volcanic gas emissions) was estimated at 803 tonnes per day as of 10/24. The monitoring of the diffuse flux of carbon dioxide (CO2) in the geochemical station of Los Llanos (LP10) reflects a higher magmatic-hydrothermal fraction than that observed in the geochemical station of Fuencaliente (LP08).

 

A partial collapse of the cone that occurred at 9:25 a.m. Monday leaves a large source of lava exposed.

An impressive lava overflow occurred around 3 p.m. local time.

At around 8 p.m. on October 25, another cone rupture occurred, with more lava overflow and landslides that generated drafts.

The average height of the column of gas and ash is 3,800 meters above sea level. The weather conditions are favorable, and the air quality remains good.

 

Sources: extracts from Noticias / 25,10,2021 - Gobierno de Canarias, IGNes, InVolcan, DSN, RTVC

Sabancaya - 20.10.2021 / 09h00 - photo Temblor / Twitter

Sabancaya - 20.10.2021 / 09h00 - photo Temblor / Twitter

The eruptive activity of Sabancaya remained at moderate levels during the week of October 18-24, with an average of 34 explosions per day, accompanied by plumes of gas and ash reaching 3,500 m. above the summit. The detection of 843 earthquakes of volcanic origin associated with the circulation of internal fluids is mentioned by the IGPeru. VT earthquakes, linked to the fragmentation of rocks, from M2.2 to 3.5, are are produced north of the volcano.

No significant deformations; seven thermal anomalies were detected, with a max. of 4MW.

The volcanic alert remains in Naranja, with a 12 km inaccessible area around the crater.

 

Source: I.G. Peru

Vulcano deformation monitoring - Radar configuration test from Lipari. - Photo INGV OE

Vulcano deformation monitoring - Radar configuration test from Lipari. - Photo INGV OE

A radar instrumentation configuration test to find the optimal parameters for remote monitoring of Vulcano deformations was performed, from Lipari. Lots of data to take away and analyze, thanks to the OE's "Periodic geodetic measurement campaigns" team

 

At 17:28 UTC a seismic signal lasting about 3 minutes was recorded, associated with a landslide event, observed at all seismic stations in Stromboli. No change in the other seismic parameters is observed.
Due to adverse weather conditions, direct observation of the phenomenon is not possible.
at 21:58 (19:58 UTC), the settings revert to
normal activity.

 

Source: INGV OE

Suwanosejima - explosion of 10/26/2021 / 1:17 p.m. loc. - JMA webcam

Suwanosejima - explosion of 10/26/2021 / 1:17 p.m. loc. - JMA webcam

An eruption occurred at Suwanosejima (Mitake Crater) at 1:17 p.m. on October 26, and the eruption plume rose 3,300 m above the crater rim.
Volcanic ash flowed south from the crater, and within an hour there was a large amount of ash in the village of Toshima.

In the beach from the crater about 5 km to the south, there is a risk that small fountains will be blown away by the wind.

 

Source: JMA

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