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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
 Villarica crater on 20/10/2016 - doc.POVI - Ruben Paillalef

Villarica crater on 20/10/2016 - doc.POVI - Ruben Paillalef

The POVI reported changes in the crater of the Villarica during the second part of October, 2016.
The crater of the volcano, with a diameter of 200 meters is home, to 80 meters deep, of a pit containing an active lava lake, whose level has not varied between observations on 17 and 20 October.
After an interruption due to weather conditions, the observations of October 27 and 28 have revealed the presence of two active wells. One of them is surrounded by a small pyroclastic cone, nestled in the crater floor. This cone has parallel annular cracks on its left bank ... indicating an ongoing slump.
On October 30, the cone collapsed, and the level of lava in the well has recovered the level measured on 17 October.


Source: POVI / Chile

Villarica - developments in the crater between 17 and 30 October - doc. Povi

Villarica - developments in the crater between 17 and 30 October - doc. Povi

In Sinabung, an eruption was accompanied on November 6 at 7:46 p.m., by a plume rising to an altitude of 1,500 meters and a pyroclastic flow that has advanced 700 meters towards the ESE. Ash fallout are recorded on the capital of Karo.


Source: BPBD Kab Blitar

Sinabung - 07/11/2016 - photo DPDT Kab Blitar

Sinabung - 07/11/2016 - photo DPDT Kab Blitar

In Iceland, following the eruption that formed the Holuhraun lava field in 2014-2015, the heat of it remains as it melts the snow.


Source: Nasa EO1 / Ali

The Holuhraun lava field stands out against the surrounding snow - photo Nasa EO1 Alo 11/05/2016

The Holuhraun lava field stands out against the surrounding snow - photo Nasa EO1 Alo 11/05/2016

In Japan, the series of earthquakes that marked Kumamoto Prefecture in last April was cushioned by the magma chamber of the volcano Aso, according to studies by the team A.Lin professor of Kyoto University.


The fault rupture that spanned nearly 20 km was inhibited by the presence of the magma chamber of Aso, situated at a depth of 6 km under the caldera.
But
a few rows of linear ruptures stretched over several kilometers on the ground in Mount Aso’s calder
a. Scientists believe that these vertical fractures appeared under the pressure of the magma chamber when sheblock the fault. They range in depth and could become conduits through which magma can infiltrate and mount. This situation requires a reassessment of the risk of eruption of Aso volcano.


Source: The Asahi Shimbun

Aso San - faults under the volcano - Doc. The Asahi Shimbun

Aso San - faults under the volcano - Doc. The Asahi Shimbun

Aso San summit - photo National Geographic

Aso San summit - photo National Geographic

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