Continued yellow alert on the Lascar volcano.
On October 30, the Onemi decreed the alarm after detecting an emission of ash more than 2,500 meters high. The « Fach« make an overflight on Sunday on the volcanic massif.
For the fifth consecutive day the yellow alert for the massif of Lascar volcano located in the Antofagasta region continue.
According to the report, after the volcanic activity the alert was extended for San Pedro de Atacama. Therefore, on Sunday, November 1, the Air Force of Chile made a reconnaissance flight over the area with a plane belonging to Aerofotogramético Lear Jet Service.
With this analysis, the Onemi and the SERNAGEOMIN continue to monitor the online behavior of the volcanic massif.
Based on the analysis of information collected by surveillance equipment and monitoring of volcanoes, the National Geology and Mining Service ( SERNAGEOMIN) through the Volcano Observatory of the southern Andes (OVDAS), communicate: –
During this month, a total of sixty-two (62) seismic events, including eight (8) who were classified as volcano-tectonic (VT), were recorded. These events linked to the fracturing process of a rigid material, provided a maximum power of local magnitude (ML) equal to M 0.5. Similarly, it was recorded fifty-four (54) events associated with the fluid dynamics inside the volcano, classified long period (LP) of local quantities (ML) equal to M 1.2 and lower and value of reduced displacement (DRC) of 0,7cm2.
On October 30 at 9:32 HL (12:32 GMT) through the webcam, ash emissions from the Lascar volcano was observed with a height of over 2,500 m, and heading north-east (NE) of the volcano, seismic signal that accompanied this process introduced a small displacement of 1 cm2, value considered as low to moderate.
Observations of glow, at night with IP cameras, were recorded, the latter being correlated with the thermal radiation released by Mirova (Medium Infrared Observation of volcanic activity).
From the data provided by the three GNSS stations, which measure the deformation of the surface of the volcano, it was observed during the last period, by the station located south of the active crater, a moderate scale movement, constant in time, showing a shortening of 1.8 cm of the length of the line crossing the active crater of the volcano
Sulfur dioxide emissions (SO2) of the Lascar volcano, recorded by the team DOAS (optical absorption spectrometry differential) of the Lascar station, located 6 km north–northwest (NW) of the active crater presented a monthly average of 491 ± 47 t / day and a maximum value of 1171 t / day, registered on 30 October.
This increase in flow observed on 30, is associated with the increase in the internal activity of the volcanic system.
November 07, 2015. Lascar, Chili :
Source : Sernageomin, Latercera.com