Nevados de Chillan, Chili : formation of a new crater.

Nevados de Chillan, Chili : formation of a new crater.

The National Service of Geology and Mining (SERNAGEOMIN) – Observatorio volcanologico de los Andes del Sur (OVDAS) announces that Saturday, January 30, an overview of the Nevados de Chillan volcanic complex, with the support of ONEMI, in order to evaluate the the volcanic complex surface activity.
In the overview it was found that the result of successive phreatic explosions, recorded in recent days has been the formation of a new crater. It is located about 50 m from the crater of the volcano Arrau on the slopes North – East of the latter center.

The new crater has a diameter of 25-30 m and is at a similar level to that formed on January 8, but active at this stage.
Also, various points of emissions were identified, primarily located on the east side of the crater Arrau, the center of the emissions formed on January 8 and the newly formed crater.
Ash emissions have continued sporadically since the active craters, usually as phreatic explosions that emitted gases, ash and larger blocks ejected in the environment and sometimes sliding on the slope. In addition, the thermal images obtained recorded a maximum temperature of 125 ° C, indicating the activity of deep hydrothermal system, even without the presence at the surface of magmatic phase of high temperature.
This confirms that the hydrothermal system destabilization process continues to evolve, due to the transfer of heat from a magma body underlying phreatic explosions generating low energy, which expelled the materials newly formed of the craters.

In this scenario, the occurrence of phreatic explosions of equal or greater magnitude and / or phreatomagmatic eruptions, is possible, and, at a later stage, could represent an area of greatest impact.
Therefore, is considered high risk area in the current situation, the area included within a 2 km radius around active craters and it is recommended to restrict its access.
The level of technical volcanic alert level remains at yellow, with particular emphasis on its evolution.
The SERNAGEOMIN -OVDAS continuous online monitoring and report in due course on any change in volcanic activity in the region.

February 01 , 2016. Nevados de Chillan, Chili :


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