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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, #Sismologia
Santiaguito - gas and ash pan from 12/17/2021 - UPV photo from CONRED - one click to enlarge

Santiaguito - gas and ash pan from 12/17/2021 - UPV photo from CONRED - one click to enlarge

Santiaguito - 12.17.2021 - incandescence at the Caliente dome, avalanches on the flanks (Insivumeh webcam) and pyroclastic flow (Conred image) - one click to enlarge

Santiaguito - 12.17.2021 - incandescence at the Caliente dome, avalanches on the flanks (Insivumeh webcam) and pyroclastic flow (Conred image) - one click to enlarge

The Santiaguito is in a period of strong extrusion of volcanic material, which accumulates in the Dome Caliente, causing a detachment of material that descends in the form of weak and moderate avalanches, on the western, southwest and eastern flanks.

Due to the unstable materials in the crater, there is a probability of generating moderate to strong pyroclastic flows, so one should not stay near or in the river beds near the slopes of the volcano.

Within this activity, weak and moderate explosions were observed, with columns of gray ash dispersing to the south, southwest, west at a distance of 20 kilometers, there is ash in the environment and on the villages of San Marcos Palajunoj, Loma Linda and the farms of this region.

 

Sources: Insivumeh & Conred

Ili Lewotolok - eruptive plume of 12/16/2021 / 6:36 a.m. - photo PVMBG / Magma Indonesia

Ili Lewotolok - eruptive plume of 12/16/2021 / 6:36 a.m. - photo PVMBG / Magma Indonesia

Ili Lewotolok - Strombolian activity on 12/16/2021 / 6:36 a.m. - photo PVMBG / Magma Indonesia

Ili Lewotolok - Strombolian activity on 12/16/2021 / 6:36 a.m. - photo PVMBG / Magma Indonesia

Mount Ili Lewotolok experienced an eruptive episode on Thursday, December 16, 2021 at 6:43 a.m. WITA, accompanied by a plume of gray to black ash, observed at ± 500 m above the summit (± 1923 m above the level of the sea), drifting west. This eruption was recorded on a seismograph with a maximum amplitude of 28 mm and a duration of 48 seconds.

On the same day at 8:26 p.m. WITA, another eruptive episode occurred, accompanied by an ash plume ± 300 m above the summit (± 1723 m above sea level). The ash column is white to gray in color with fine to moderate intensity towards the west. This eruption was recorded on a seismograph with a maximum amplitude of 13 mm and a duration of 28.9 seconds.

The eruption has continued since November 27, 2020.

 

Sources: PVMBG, Magma Indonesia and GVP

La Palma / Cumbre Vieja - 12.17.2021 / 9.30 a.m. loc. - degassing making the air quality limited in certain areas - photo InVolcan

La Palma / Cumbre Vieja - 12.17.2021 / 9.30 a.m. loc. - degassing making the air quality limited in certain areas - photo InVolcan

La Palma / Cumbre Vieja seen from the Mirador Astronómico del Llano del Jable on 17.12.2021 / 11h loc. - photo InVolcan

La Palma / Cumbre Vieja seen from the Mirador Astronómico del Llano del Jable on 17.12.2021 / 11h loc. - photo InVolcan

In La Palma, the IGN recorded 96 earthquakes in the last 24 hours at 17.12 / 09h UTC, including a few low frequency (LP) earthquakes.
46 earthquakes were located between 8-16km, 47 at more than 30km, 3 at less than 3 km., The greatest magnitude being 3.5 mbLg
No tremor observed.

No emission is observed. The Cumbre Vieja volcano continues its deactivation and relaxation, the only novelty is that many white salt crusts have formed due to the formation of precipitates of carbonates and salts, carried by the steam that comes out of hot and active areas.

Although the situation is favorable for the completion of the eruptive process, a resumption of activity cannot be excluded: the history of the eruptions shows stops of several days in the previous eruptions.

The emergency situation is maintained, as are the Civil Protection measures.

Due to the presence of toxic gases, especially in the southern zone, the UME is now joining the Civil Guard system in supporting work on the assessment and measurement of gas levels.

 

Sources: InVolcan, IGN, IGME

La Palma - seismicity at 12.17.2021 / 07:02 am - Doc. IGN - one click to enlarge

La Palma - seismicity at 12.17.2021 / 07:02 am - Doc. IGN - one click to enlarge

La Palma - RSAM of the seismic stations (legend on the left) of La Palma on 17.12.2021 - Doc. IGN - one click to enlarge

La Palma - RSAM of the seismic stations (legend on the left) of La Palma on 17.12.2021 - Doc. IGN - one click to enlarge

On Tenerife, seismic activity has been recorded at about 6-8 km in the region of Adeje and at about 8-11 km in the region of Caldera and Guia de Isora. For a fortnight. Involcan recorded 59 earthquakes in 14 days.

For 5 years, several stronger seismic swarms have occurred in this area, in October 2016, November 2017, November 2018, July 2019.

This activity is under surveillance.

 

Sources: IGN, InVolcan & Volcanes y Ciencia Hoy.

Tenerife - earthquakes of the last 90 days to 18.12.2021 - Doc. IGN.es - one click to enlarge

Tenerife - earthquakes of the last 90 days to 18.12.2021 - Doc. IGN.es - one click to enlarge

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