The level of activity of the volcano is at the level: YELLOW: changes in the behavior of the volcanic activity -Time for an eruption: Weeks / month.
Based on the analysis of information obtained by monitoring equipment and surveillance of the volcano, the Servicio Nacional de Geologia y Mineria (SERNAGEOMIN) -Observatorio Volcanológico de Los Andes del Sur (OVDAS) announces:
-During This period, twenty (23) seismic events, including seven (7) were classified as volcano-tectonic (VT) associated with rock fracturing process were recorded.
Similarly, sixteen (16) fluid dynamics-related events inside the volcano, identified as volcanic earthquakes long period (LP) were recorded.
Regarding seismic activity type VT, the local magnitude (ML) are less or equal to M 2.0 . The highest energy event was located on the northeast side (NE) to 15.4 km of the crater El Agrio, at a depth of 1.2 km.
Regarding LP type of events, they presented reduced displacement values (DRC) below 12.0 cm2, so the local magnitude (ML) was lower than M 2.0 and mainly located around the crater.
During the month, there was a constant tremor signal, primarily associated with the release of particulate matter (gas and ash) from the crater El Agrio, which recorded oscillating DRC values, generally less than 5.4 cm2 , values that are intermediate
/ High for this volcano. The dominant frequencies are concentrated in a bandwidth from 1.0 to 1,4Hz.
Following the data obtained from five (5) GNSS stations, which seek to measure the deformation of the surface of the volcano, it was observed that the horizontal and vertical components showed low swings similar to those recorded during of the year . The largest rate of change of the horizontal components is 0,18cm / month, the greatest change of the vertical component, was 0.23 cm / month.
The situation noted above, clearly reflects an increase in length of about 2 cm from the previous year, reflecting a slight inflation.
Sulfur dioxide emissions (SO2) recorded on the volcano Copahue by the team DOAS (Differential Optical Absorption Spectrometry) Triplets station, located 5 km to the east-northeast (ENE) of the active crater, have a mean value of 693 ± 128 t / day and a maximum value observed during the first two weeks of 2079 t / day, registered on March 8. The average flow is considered as low level for the volcano.
IP cameras installed near the volcano experienced a constant emission of material from the active crater (El Agrio), accompanied by an incandescence. These emissions have been characterized most of the time, with a gray color, showing the presence of particulate matter.
Satellite images have measured the distance reached by the plume, with values ??of up to 50 km from the El Agrio crater with directions to the southeast (SE) and the South-East (ESE).
Images published by the Sulfur Dioxide Group (instrument for monitoring the Ozone-friendly http://so2.gsfc.nasa.gov/) and NESDIS (National Environmental Satellite, Data and Information – http: // satepsanone .nesdis.noaa .gov) reported no abnormality of sulfur dioxide (SO2) into the atmosphere in the volcanic complex sector.
The thermal radiation released by the MODVOLC (Moderate Resolution Imaging Spectroradiometer) MODIS on its website (http: //modis.hig p.hawaii.edu/) and Mirova (Middle InfraRed, Observation of volcanic activity) on its website (http://www.mirovaweb.it/), surveillance systems that indicate significant changes in surface temperature, reported no thermal alerts associated in the volcano area.
According to the monitoring indicators described above, it follows that the activity related to the interaction between a magma body of a small volume to deep levels in the volcanic structure with superficial hydrothermal system continues without reaching an imbalance , maintaining it in what is called a balance “meta-stable”. Such activity may continue for a long period oscillation, without excluding specific increases associated with the activity
Small phreatic explosions and / or low strombolian activity in the crater area can occur.
Therefore, restrict access to the proximal zone within a radius of 1.5 km around the crater El Agrio is recommended. The level of technical alert level remains at Yellow.
March 19, 2016. Copahue , Chile :
Source : Sernageomin
Photos : Volcanes Andinos.