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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 : #Actualités volcaniques
 Sheveluch - explosion of 04.12.2017, with its ash plume at 10 km and at its base, the traces of the lahar (white plume) - photo Y.Demyanchuk / KVERT

Sheveluch - explosion of 04.12.2017, with its ash plume at 10 km and at its base, the traces of the lahar (white plume) - photo Y.Demyanchuk / KVERT

An explosive eruption produced an ash plume rising to about 10,000 meters on December 4, 2017 at 9 am local to Sheveluch / Kamchatka; the ashes dispersed over 127 km to east-northeast.
A small pyroclastic flow interacted with the snow cover and generated a lahar.
 
Source: KVERT & VAAC Tokyo

Sheveluch - Volcanis Ash advisory 04.12-05.12.2017 - VAAC Tokyo

Sheveluch - Volcanis Ash advisory 04.12-05.12.2017 - VAAC Tokyo

In Chile, the Nevados volcanoes of Chillan and Villarica show an increase in activity.
 
On December 4, OVDAS recorded a new eruption of ash and water vapor at the Nevados de Chillan complex; the plume rose about 2,000 meters above the massif.
The technical alert is maintained at Amarilla.

Complex Nevados de Chillan - 04.12.2017 - one click to enlarge - photo SernageominComplex Nevados de Chillan - 04.12.2017 - one click to enlarge - photo Sernageomin

Complex Nevados de Chillan - 04.12.2017 - one click to enlarge - photo Sernageomin

In Villarica, the observatory notes an increase of various parameters: the seismicity is characterized by volcanotectonic earthquakes of moderate energy, the volcanic tremor is more energetic, the activity of the lava lake, measured by the infrasonic system, is increasing, in relation to a thermal anomaly between 10 and 82 MW.

The level of technical alert is Amarilla / Yellow from today.


POVI posted a rare image of the entire Villarica volcanic complex, discovering parasitic cones, eruptive fissures, calderas, the Turbio-Pichillancahue glacier and the degassing active crater.
 
Sources: Sernageomin, OVDAS, POVI

Villarica - thermal anomalies on 05.132.2017 / 6h - doc. Mirova Modis

Villarica - thermal anomalies on 05.132.2017 / 6h - doc. Mirova Modis

  Villarica - beautiful coloration of the plume of hot gas this 03.12.2017 - photo Francisco Negroni

 Villarica - beautiful coloration of the plume of hot gas this 03.12.2017 - photo Francisco Negroni

The volcanic complex Villarica - photo 02.12.2017 Ricardo Copetta D. / POVI

The volcanic complex Villarica - photo 02.12.2017 Ricardo Copetta D. / POVI

At the Agung, a gray-white plume rose to 500-1,000 meters above the crater, then bowing eastward on December 4 at 23:15 WITA. Nighttime glow was observed.
The seismicity is characterized this December 4 by 4 deep volcanic earthquakes VA, 14 superficial volcanic earthquakes VB, 29 low frequency earthquakes and 2 harmonic tremor episode.
The level of the tremor is of 1-2mm of amplitude, with a dominant at 1 mm.


Agung - Sentinel radar image 1 SAR-C of 02.12.2017

Agung - summary histogram of seismicity on 04.12.2017 - Doc. Magma Indonesia

Agung - summary histogram of seismicity on 04.12.2017 - Doc. Magma Indonesia

Agung - Sentinel radar image 1 SAR-C of 02.12.2017

Agung - Sentinel radar image 1 SAR-C of 02.12.2017

Photos taken by journalists (allowed to enter ?) in the red zone show a large ash cover: the vegetation of the area is gray, as are the temples located there. The necessary protection recommendations regarding volcanic ash are recalled, ash being able to move out of the forbidden zone.
 
Sources: PVMBG, BNPB, Magma Indonesia

Life in the ashes of the forbidden zone - the golden portal of the temple contrasts with the walls blackened by the ashes of the Agung - photo Solo Imaji - Barcroft Images

Life in the ashes of the forbidden zone - the golden portal of the temple contrasts with the walls blackened by the ashes of the Agung - photo Solo Imaji - Barcroft Images

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