Cotopaxi , Equateur : The characteristics of the seismic activity of the volcano Cotopaxi have changed .

Cotopaxi , Equateur : The characteristics of the seismic activity of the volcano Cotopaxi have changed .

The characteristics of the seismic activity of the volcano Cotopaxi have changed compared to the previous week, the most notable changes are:
1) the occurrence of daily volcano-tectonic earthquakes type decreased from 130 to 87;
2) tremor episodes were diffuse. The energy associated with the activity just undergone a slight increase due to these episodes of tremor.

Most localized events are located below the crater, less than 12 km deep. In addition, there have been other types of events, such as hybrid events and very low frequency events (VLPs).

During the overflight conducted on October 2, the lack of cloud cover allowed to be measures of almost all thermal anomalies identified and analyzed during previous flights. The apparent maximum temperature (TMA) corresponded to an inner crater sector valued at 104.3 ° C. It was noted that, unlike the flight of 29 September, now is a homogeneous area with high temperature on the interior walls of the crater. As regards fields of fumerole, it was observed a similar increase in the temperature of some of them. For example, the site « the eastern flank 1« the value of the TMA was 57.9 ° C measured in relation to 51º C, measured on the previous flight.

We observed that a new magma pulse has reached sufficient surface levels, which so far have produced the following phenomena on the surface:
* Glow in the crater,
* Ash emission,
* Increased SO2 degassing rate

October 10, 2015. Cotopaxi , Equateur :
Source : IGEPN

Photo : José Luis Espinosa Naranjo.

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