During this period, the LP-type earthquakes (associated with a fluid passage) experienced a slight increase from a rate of 15 LP / day (Report No. 11-2016) to 18 LP / day during this week. Seismic energy shows a peak of 14.8 MJ on March 18, however, they continue to maintain low levels of energy. Regarding hybrid type events (associated with magmatic ascent), they were not recorded in this period.
VPS type earthquakes (proximal-Tectonic Volcano, distant less than 6 km from the crater), continued to appear with a reduced size. They recorded an average of 5 VTP / day. On the other hand, the VTD events (distal Volcano-tectonic) continue to represent a significant seismicity.
Tremor type of events (TRE) recorded in this period decreased from an average of 14 TRE / day (Report No. 11-2016) to 11 TRE / day this week. Furthermore the energy is low.
During this period, it was recorded and located a total of 234 VT events. These events continue to be distributed in one area, in the Northeast, 13 km from the crater.
VTP localized events (called proximal) were presented on the decline in this period. It must be emphasized a magnitude M 2.9 event recorded on March 15 at 2:22 UTC, located 5 km northeast of the crater at a depth of 19 km.
Seismicity VTD located (distal seismicity) totaled 221 events and continued to be distributed in a single marked area, 13 km north-east of the crater. It is distinguished by 3.7 ML and 3.4 ML events. The first event was recorded on March 18 at 2:26 p.m. UTC; the second, on 15 March at 11:23 p.m. UTC, at depths of 14-15 km.
• Frequency: water vapor emissions were stable this week, 24 hours a day, with lower average densities.
• Color: The gas observed are whitish, which is characteristic of fumarolic emissions from the Sabancaya. Moreover, sporadic emissions of bluish tones were observed at some parts of the day.
• Height: In this period (15-21 March), fumaroles expelled by Sabancaya were recorded at heights between 200 and 1000 meters above the base of the crater, approximately. It should be noted that the nebulae in this region remained high, which prevented a complete picture of the volcano in the last week.
Satellite monitoring of the density of SO2 and thermal anomalies detected no significant anomalies in this period.
March 23, 2016.Sabancaya , Peru :
Source : IGP
Photos : IGP ,