Based on the analysis of information collected by the monitoring equipment and by monitoring volcanoes, the National Geology and Mining Service (SERNAGEOMIN) -Observatorio Volcanológico South Los Andes (OVDAS), announces:
During this period, 474 seismic events , including three hundred and forty (340) who were classified as volcano-tectonic (VT) associated with fracturing rocks events were recorded.
Similarly, 134 events were recorded associated with fluid dynamics inside the volcano , thirty-three of which (33) were identified as the long period earthquakes (LP) and one hundred (101) very long events period (VLP).
Concerning VT seismicity, they were located primarily on two sources, the first under the volcano, and the second on its northeast quadrant (NE). The maximum local magnitude (ML) was M3,6 (REAV 02DE October 21: 35hl) on the second mentioned spot.
– Regarding the seismic LP and VLP, it reached a maximum of 1.3 M local magnitude (ML) and reduced movement (DRS) of 99,3cm2 maximum. These events associated with fluid dynamics were mainly located under the volcano, with epicentral distances of less than 3.5 km.
– On October 24, a swarm of seismic events associated with rock fracturing (VT) was recorded. These events were mainly located northeast (NE) of the crater Agrio, an epicentral distance of 11 km and an associated depth of 8 km. The total number of recorded events was 41 in a time interval of 1 hour and 15 minutes, from 10:15 to 11:30 HL.
Concerning the surface activity, when weather conditions have allowed, IP cameras installed near the volcano recorded the recurring presence and sometimes continuous gas emission and ash from the active crater (El Agrio) . These emissions are characterized mostly by their gray color, showing the presence of particulate matter.
Finally, the column reached a maximum height of 850 m above the crater on October 30 at 7:58 p.m. HL. Due to satellite pictures the ash cloud was observed up to 60 km from the El Agrio crater with preferential directions Southeast (SE) and East-South- East (ESE).
According to the data obtained from the three (3) GNSS positions, which measure the deformation of the volcano, no significant variations in the horizontal position ( Sulfur dioxide (SO2) recorded on the Copahue volcano, by equipment DOAS (Differential Optical Absorption Spectrometry) Twins Station, installed at 5 km to the east-northeast (ENE) of the active crater, have presented a monthly average of 692 ± 105 t / day and a maximum value of 2676 t / day, registered on 30 October.
The increase in observed values ??of the degassing suggest changes in volcanic system.
November 10, 2015. Copahue , Chile :
Source : Sernageomin.
Photos : Alto Valle Valle Medio, La Nacion.