Copahue , Chile : changes in the behavior of volcanic activity .

Copahue , Chile : changes in the behavior of volcanic activity .

The level of activity of the volcano is at:
LEVEL YELLOW: changes in the behavior of volcanic activity – time likely for an eruption weeks / months.

– During this period 332 seismic events were recorded, seventeen (17) were classified as volcano-tectonic (VT) associated with rigid material fracturing processes. Similarly, three hundred and fifteen (315) events associated with dynamics of fluids inside the volcano, identified as volcanic earthquakes long period (LP) and very long period (VLP) were recorded.

– Regarding the seismicity VT, their local magnitude (ML) was less or equal to M1,5. The higher energy event was located on the southeast flank (SE), at 5.3 km to El Agrio crater with a depth of about 8.2 km.
– Regarding the events related to fluid dynamics, LP type of events , they presented local magnitude (ML) under M1,2, while VLP events presented local magnitude (ML) below M1 , 7; these events were located around the crater.
– Throughout the month, it was noted a constant tremor signal, increasing slightly in magnitude in recent days and mainly associated with the release of particulate matter (gas and ash) from El Agrio crater. The dominant frequencies are generally concentrated in a bandwidth from 0.5 to 2.7 Hz, except for the last days where the frequency range was between 3.5 and 4.0 Hz combining the characteristics of the tremor and continuous and repetitive LP events, signal characteristics in the previous process of the volcano.
– From the data obtained from the four (4) GNSS stations, the deformation of the surface of the volcano appeared stable.

The sulfur dioxide emissions (SO2) recorded on the Copahue volcano by the team DOAS (Differential Optical Absorption Spectrometry) Triplets Station, located 5 km to the east-northeast (ENE) of the active crater has a mean value of 1844 ± 2040 t / day and a maximum value of 5848 t / day, raised on June 8, this value is considered high for this volcano.
– IP cameras installed near the volcano have seen a steady gas emissions from active crater (El Agrio), a glow was observed throughout the period. However, in recent days, there have been specific increases in the intensity and height, of gas fumes associated with a higher temperature and possibly small phreatic explosions or “projections” of ballistic objects limited to the crater area.

– Thermal radiation released by Mirova (Middle InfraRed Observation) on its website (http://www.mirovaweb.it/) and MODVOLC (Moderate Resolution Imaging Spectroradiometer) MODIS on its website (http: // modis .higp. hawaii.edu /), surveillance systems that indicate significant changes in surface temperature, noted thermal anomalies that were observed during the first two weeks, the 04, 08, 11, 13 and 14, with recording a maximum radiative power value (PRV) 14 MW on June 14, considered as moderate value.
This suggests a new intrusion of magma in the surface layers, may be a small volume as a function of the absence of significant signs of deformation of the volcano. Therefore, is considered high risk zone that contained in a radius of 1.5 km around the crater El Agrio and it is recommended to limit access.

 

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June 22 , 2016.Copahue , Chile :

Source : Sernageomin.

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