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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
Semeru - in one of the villages affected by ashes and lahars - Doc. CGTN 05.12.2021

Semeru - in one of the villages affected by ashes and lahars - Doc. CGTN 05.12.2021

As observed this morning (6.12), at 08:55 WIB, pyroclastic flows again occurred at Semeru with a sliding distance of 4 km leading to Besuk Kobokan.

Based on the latest data from Monday 6.12, at 8:15 p.m. WIB, the temporarily recorded deaths include 56 injured, 22 missing and 22 dead. Meanwhile, the number of people affected is 5,205 people and 2,004 displaced people. Regarding the number of residents who have been declared missing, the Command Post is still collecting and validating the data.

Details of the deceased victims identified 14 people in Pronojiwo district, while 8 people in Candipuro district.

The Ministry of Public Works and Public Housing (KemenPUPR) indicated the mobilization of staff to help with several stages of emergency treatment after the eruption, including the cleaning of the road network to restore connectivity to national, provincial and district, looking for alternative routes to connect Lumajang-Turen-Malang which was broken due to the collapse of the Besuk Kobokan Bridge.

The armed forces are present in number and with the appropriate gear.

Semeru - pyroclastic flow at 07.12.2021 / 06:02 - Doc. Magma Indonesia

Semeru - pyroclastic flow at 07.12.2021 / 06:02 - Doc. Magma Indonesia

Three eruptive episodes are reported on December 7:

 - at 01:02 WIB with the height of the ash column observed at ± 1000 m above the summit (± 4676 m above sea level). We observe that the ash column is gray in color with a thick intensity towards the north. This eruption was recorded on a seismograph with a maximum amplitude of 20 mm and a duration of 297 seconds.
- at 02:44 WIB with the height of the ash column observed at ± 1000 m above the summit (± 4676 m above sea level). We observe that the ash column is gray in color with a thick intensity towards the north. This eruption was recorded on a seismograph with a maximum amplitude of 20 mm and a duration of 454 seconds.
- at 05:54 a.m. WIB with the height of the ash column observed at ± 1000 m above the summit (± 4676 m above sea level). The ash column was white, gray to brown with moderate to thick intensity towards the southeast. This eruption was recorded on a seismograph with a maximum amplitude of 22 mm and a duration of 267 seconds.

 

Source: BNP B, PVMBG and Magma Indonesia

Semeru - a drama caused by atmospheric conditions? - infographic Alistair Hamill @lcgeography - one click to enlarge

Semeru - a drama caused by atmospheric conditions? - infographic Alistair Hamill @lcgeography - one click to enlarge

In Fuego, the increase in radiance values ​​recorded from the evening of December 4 shows the appearance of a lava flow in the Ceniza canyon, which according to OVFGO reports reaches 500 meters in length and has generated abundant avalanches in the direction of the canyon in question.

This Strombolian activity continued to increase during the afternoon and night, generating almost continuous explosions, which raise pulses of incandescent material to heights between 200 and 300 meters above the crater. The activity is accompanied by abundant avalanches towards the ravines of Trinidad, Taniluyá, El Jute, Las Lajas and Seca, some reaching the edge of the vegetation.

Sometimes the explosions produce dense ash plumes that rise to 4,700 meters and spread south and west. Low and moderate sounds are heard, audible to several
kilometers in the municipalities of the southern flank. The network of seismic stations records the activity of explosions and tremors (internal vibrations).

 

Source: Insivumeh

Fuego - increase in radiance at 07.12.2021 - Doc. Insivumeh - one click to enlarge

Fuego - increase in radiance at 07.12.2021 - Doc. Insivumeh - one click to enlarge

In La Palma, the Cumbre Vieja lava flow advances south of the existing lava field; she reached the cliff and waterfall towards the fajana set up by the San Juan volcano. A thermal camera video taken on December 6 around 10 a.m. Shows the most recent advances of the flow, while the northern area remains largely unchanged.

Due to the gusts of wind, the drones were unable to operate in the last few hours, so it was not possible to update the data on the damage to the new infrastructure or to the affected area, estimated, according to the latest reports, at 1,155 hectares with a maximum width of 3,350 meters, and the total extension of the lava deltas is maintained at 48.03 hectares.

Seismicity at intermediate depths remains low and the number of earthquakes at depths greater than 20 kilometers remains at very low values.

The air quality values ​​remain unchanged, with a general decrease in the presence of particles smaller than 10 microns due to the lower incidence of haze.

 

Source: IGN, IGME, DSN, Copernicus

La Palma - Cumbre Vieja from Dos Pinos dam (Los Llanos) on 06.12.2021 / 09h loc.- Doc. InVolcano

La Palma - Cumbre Vieja from Dos Pinos dam (Los Llanos) on 06.12.2021 / 09h loc.- Doc. InVolcano

La Palma - cascade of the southern flow of Cumbre Vieja towards the fajana of the volcano of San Juan on 06.12.2021 / 10am. - InVolcan

La Palma - cascade of the southern flow of Cumbre Vieja towards the fajana of the volcano of San Juan on 06.12.2021 / 10am. - InVolcan

La Palma - eruption of Cumbre Vieja 06/12/21 drone flight at 13:30 h, (thermal + RGB). Doc. IGME

 La Palma - coulées du Cumbre Vieja au 05.12.2021 / 07h50 - Doc. Coperncus EMSR

La Palma - coulées du Cumbre Vieja au 05.12.2021 / 07h50 - Doc. Coperncus EMSR

The National Institute of Geophysics and Volcanology, Etneo Observatory, reports that, according to weather conditions, from around 08:00 UTC, almost continuous ash emissions are observed from the southeast crater of Etna, which are scattered near the summit area towards the ENE. The amplitude of the tremor increases slowly, with values ​​always in the average. The signal sources are located in the south-eastern crater area at a level of approx. 2700 a.s.l. The infrasonic activity is weak. No significant changes in soil deformation monitoring network data.

 

Source: INGV OE

Etna summits - image Sentinel-2 bands 12,4,2 from 05.12.2021 - one click to enlarge

Etna summits - image Sentinel-2 bands 12,4,2 from 05.12.2021 - one click to enlarge

Etna SEC - ash emission blown down by the winds on 06.12.2021 in the morning - photo Boris Behncke

Etna SEC - ash emission blown down by the winds on 06.12.2021 in the morning - photo Boris Behncke

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