LP type Earthquakes (associated with the passage of volcanic fluids) during this period remained at a similar average to the previous report (14 LP / day, Report No. 16-2016). LPs statistics show a 15.3 MJ peak power on April 24, which decreased thereafter. On the other hand, only one hybrid type event (associated with the ascent of magma material) at this stage of the analysis was recorded.
VPS type Earthquakes ( Volcano -Tectonic proximal , located less than 6 km from the crater), continued to decline, reaching an average of 4 VTPS / day in the period. Similarly, the scale of events for this period decreased, the maximum recorded was magnitude 2.6 ML (local magnitude). Events of Tremor type (TRE), during this period, have dropped dramatically, from an average of 29 TRE / day to 18 TRE / day, while energy remains low.
The location on the map for this period continues to show a predominance of volcano-tectonic events. These events were in the same seismic area than previous periods (14 km northeast of the volcano crater). In total, 140 VT event were located.
Also in this period, 8 VTPS events of magnitude between M2.2 and M2.6 were located. Among them stand out 2 main events, both with the same magnitude M 2.6, recorded on 24 and 25 April at 16:51 and 9:33 p.m. UTC , respectively, and at a shallow depth of 3.5 km.
VTDs events (Volcano-Tectonic Distal, located more than 6 km from the crater) comes off an M 3.3 event located in an area at 14 km to the North East, recorded on April 20 at 21:44 hours UTC and to a depth of 5 km.
• Frequency: Until April 19, intense clouds covered the area around the volcano, making it impossible to clearly distinguish emissions from fumaroles of the Sabancaya. On 20th, it was possible to appreciate the constant fumeroles, low density and a different coloration.
• Color: Whitish emissions (water vapor) and bluish gas (magmatic gases) were observed at a time. This recognition was made possible by the absence of cloud cover.
• Height: No more variation. Overall, emissions ranged between 400 meters and 1200 meters above the base of the crater.
April 27 , 2016. Sabancaya , Peru :
Source : IGP Perou.
Photo : Benjamin Bernard.