Based on the analysis of information collected by surveillance equipment and the volcano monitoring staff, the National Geology and Mining Service (SERNAGEOMIN) through the Volcano Observatory of the southern Andes (OVDAS), communicates the following:
Since 7:30 p.m. (10:30 p.m. GMT) on 19 November, the seismicity of Copahue volcano presents oscillating variations in the amplitude of the tremor signal, reaching values of reduced displacement (DR) at least equal to 3, 0 cm2, with frequencies between 1.2 to 2.7 Hz, with dominant frequency of 1.5 Hz, with monochromatic trends by periods.
– In addition, from 3:05 HL (6:05 UTC) the level of activity on the surface of the crater began to increase with small explosions accompanied by ash emissions and incandescence. The explosion of higher energy appeared at 03:40 (6:40 GMT) with an acoustic component of 1.4 Pa reduced to 1 km and a maximum height of 1000 meters, located to the East – North – East (ENE).
At the time of publication of this report the particles of matter emissions continue, and so it will evaluate their evolution over time.
Therefore, as this scenario may continue producing minor explosions in the crater, the recommendation to an exclusion zone of 1.5 km around the crater El Agrio is repeated, to be considered as high risk area and the level of technical alert remains at YELLOW level.
November 22 , 2015. Copahue, Chile :
Source : Sernageomin
Photo : Asociacion Geologica Argentina