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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
Lascar - photo Sernageomin

Lascar - photo Sernageomin

In northern Chile, the Lascar volcano, which is still on alert "Verde" , has thermal anomalies; they have been reported by the MIROVA site since 21.11.2018 with a peak of 52 MW on 5 December.

This increase in heat flux is concomitant with another of the sulfur dioxide emissions, detected by the Sentinel 5P-Tropomi satellite.

Lascar - thermal anomalies from 21.11 to 06.12.2018 / 3h - Doc.Mirova Modis

Lascar - thermal anomalies from 21.11 to 06.12.2018 / 3h - Doc.Mirova Modis

Lascar - sulfur dioxide emissions on 22.11.2018 - image Sentinel 5P Tropomi via Simon Carn

Lascar - sulfur dioxide emissions on 22.11.2018 - image Sentinel 5P Tropomi via Simon Carn

The Sernageomin reported in its last report (October 1 to 31) 11 VT earthquakes associated with rock fracture at a depth of 7.6 km, and 140 LP earthquakes in relation to the dynamics of internal fluids.

On the webcams, a recurrent degassing at the central crater, with a predominant magmatic component, is observed, rising about 650 meters above the active crater.

Thermal camera's glow is visible at night.

Sources: Sernageomin and Sentinel 5P / Simon Carn

Lascar - nocturnal glow within active crater - webcam 06.12.2018 / 7h04 Sernageomin

Lascar - nocturnal glow within active crater - webcam 06.12.2018 / 7h04 Sernageomin

At Veniaminof, where the eruption continues, analysis of a December 2 satellite image shows a third lava lobe extending a short distance on the southeast flank of the intra-caldera cone.

A continuous low level tremor is detected in the last few days.

Alert levels remain unchanged.

Source: AVO

Veniaminof - plume over cone and tephra / ash deposits up to Perryville - Doc.Dietterich, Hannah / AVO; ESA Sentinel-2 on 22.11.2018 / 21:48 

Veniaminof - plume over cone and tephra / ash deposits up to Perryville - Doc.Dietterich, Hannah / AVO; ESA Sentinel-2 on 22.11.2018 / 21:48 

In Fuego, the day of December 5 was marked by a few explosions accompanied by plumes of gray ash at a height of 4,500-5,000 meters asl. dispersing to the west and southwest over 25 km.

Incandescent impulses are reported at a height of 150-200 meters above the crater, generating fallout in the vicinity of the crater and to the main barrancas.

Small ash falls are reported in the leeward areas.

Fuego - eruptive plume from 05.12.2018 - photo Conred

Fuego - eruptive plume from 05.12.2018 - photo Conred

At Pacaya, strombolian activity is characterized by explosions with ejections 25-50 meters above the crater falling around the Mackenney cone, which feed a bifid lava flow towards Cerro Chino, which reaches about 200 meters.

 

Source: Insivumeh

 Pacaya - Strombolian activity : ash plume and lava flow - photo Claudia Ruppitsch / Instagram 04.12.2018

 Pacaya - Strombolian activity : ash plume and lava flow - photo Claudia Ruppitsch / Instagram 04.12.2018

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