Special volcanic activity report (REAV), Bio Bio region March 18, 2016 1:50 p.m. HL.
The National Service of Geology and Mining (SERNAGEOMIN) through the Volcanological Observatory of Southern Andes (OVDAS), reports that:
Friday, March 18, 2016, from 8:44 local time (11:44 GMT), there was a change in seismic activity of volcanic Complex of Nevados de Chillan , represented by the appearance of an episode of long-period seismicity ( signals associated with the movement of fluids in the volcanic system), repetitive, with an occurrence rate of 3 to 4-event per minute, low energy (DRC> 1cm2) but significant from a qualitative point of view, because it suggests an increased activity of a shallow magmatic system.
In this scenario, it increases the possibility of occurrence of explosions and / or phreatic and /or phreatomagmatic eruptions , with an higher intensity than those that occurred previously. Therefore, it is important to consider as high risk volcanic zone , the area defined at 2 km of newly active craters and restrict it’s access completely.
The level of technical volcanic alert remains at yellow level, with particular attention to its evolution.
SERNAGEOMIN -OVDAS continuous online monitoring and report timely to the changes in volcanic activity in the region.
April 20 , 2016. Nevados de Chillan, Chile :
Source : Sernageomin.