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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
Morphological changes between 28.09.2019 and 08.10.2019 - Doc. SERNAGEOMIN

Morphological changes between 28.09.2019 and 08.10.2019 - Doc. SERNAGEOMIN

Morphological changes are reported by Sernageomin / OVDAS in the Nicanor crater of Nevados de Chillan.

A new Emission Center has opened inside Nicanor Crater, adjacent to the dome supply duct set up in December 2017. It has an oval shape, and measures 60 meters EW over 55 meters, located at 93 meters southeast of the old center of issue, still active.

His formation is associated with the major explosive sequence observed since September 30th.

Current activity is characterized by gaseous emissions and explosions at the new emission center.

The alert level remains in Naranja.

Nevados de Chillan - activity from 13.10.2019 / at 17:48 & 18:03 - webcam Sernageomin
Nevados de Chillan - activity from 13.10.2019 / at 17:48 & 18:03 - webcam Sernageomin

Nevados de Chillan - activity from 13.10.2019 / at 17:48 & 18:03 - webcam Sernageomin

An analysis of the lava flow was carried out by N. Luengo:

New results show that the Nevados de Chillán blocky lava flow on the NNE flank of Nicanor has a volume of about 437804 m3 and a thickness of up to 26 meters.

If we consider that the lava started to flow on September 1st of this year, it gives us an extrusion or emission rate (rate at which the lava moves towards the slope) of 0.2 m3 / s (very slow ). But if we go back in time when the lava began to be emitted inside the crater, forming a dome, we already know that it was growing, collapsing and filling the crater for more one year, an average extrusion rate of 0.01 m3/s was calculated, ie the current exit velocity of the lava is an order of magnitude higher, which is correlated with the higher explosive degassing, the seismicity VLP and the inflation recorded by Sernageomin in recent weeks (before and during the location of the stream).

It should be noted that over the past two weeks, thanks to the Sernageomin surveillance camera and satellite images, the lava flow has been completely stopped.

The overflight was carried out outside the exclusion zone imposed by the authorities and we call to respect it.

 

Source: Sernageomin / OVDAS & Nicolas Luengo via Volcanologia in Chile
 

Nevados de Chillan - analysis of the lava flow - Doc. 11.10.2019 / Nicolas Luengo V. via Volcanologia in Chile

Nevados de Chillan - analysis of the lava flow - Doc. 11.10.2019 / Nicolas Luengo V. via Volcanologia in Chile

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