The number of LP events (associated with the passage of fluids) decreased during this period, with an average of 32 LP / day (Reporting Nº27-2015: LP 96 / day). The seismic energy values generated by this type of seismicity is low. The number of hybrid events (associated with the rise of magma ) decreased considerably in number and in power from 13 HIB / day and 173 MJ / day (previous report) to 6 HIB / day and 8 MJ / day.
The number of earthquakes VTPS or « proximal volcano-tectonic« (located less than 6 km away from the crater), maintaining a similar level to the activity of the previous week. During that time, they average 3 VT / day. Seismicity type VT or volcano-tectonic, fell slightly in this period, from an average of 72 VT / day (Report No. 27-2015) to 61 VT / day. The Tremor type of seismicity is low in this period and kept the values observed in the previous period. It was recorded an average of 2 Tremor / day.
The VT type of seismicity was located in the North on a seismic focus located 10 km from the crater of the volcano Sabancaya and on a second group to the north, parallel to the alignment of Sepina (NE-SW). An important event of 3.5 ML (local magnitude) occurred 15 km north-east (the second group) and took place on July 12 at 20:23 UTC. It is important to mention the recording of 03 proximal events (VTP), with magnitude between 2.5 and 2.6 ML within 3 km from the crater. It was recorded 57 VT with magnitudes between 1.6 and 3.5 ml and depths between 0 and 10 km.
Fumaroles have been consistently observed on the Sabancaya . The density of these plumes was low to medium. Primarily, they it was whitish emissions (water vapor), which have been continuously observed from throughout the day. It was also possible to distinguish bluish gas (magmatic gases), always at the crater, reaching lower heights. Regarding the height observed compared to the previous period (Report No. 27-2015), a significant increase was observed. The height of the fumaroles increased from 950 meters to 1,800 meters in the last week. However, there were days when the emissions do not reached more than 300 meters above the base of the crater.
July 15, 2015. Sabancaya, Perou :
Source : IGP Perou.
Photos : andina.com, El Pueblo.