El Misti is an active volcano, young, explosive and is considered as a volcano with increased risk in Peru, because of its proximity to the city of Arequipa (~ 17 km), which has at least a population of one million of inhabitants and a very important infrastructure in the vicinity (dams, hydroelectric plants, airports, mining centers, etc.). This volcano has had at least one major explosive eruption accompanied by about ten crises over the past 600 years.
The OVS–IGP, in the last 10 years, to obtain scientific results with the seismic monitoring in real time, developed a « base-line », which is now used to compare and track the daily seismic activity of the Misti volcano.
1. Volcanic and seismic monitoring:
Earthquakes type VT or fracture showed a decrease compared to the previous period (December 1 to 30, 2015). Their daily average occurrence rate dropped from 28 to 21 VT daily. During this period, only a small seismic swarm occurred on 22 of this month, with production of up to 72 earthquakes VTs. The most representative events are located below the main crater at depths ranging between 0.7 km and 1.5 km from the summit of the volcano. The biggest event VT of this period was held on January 13 than 12: 21HL (local time), with a magnitude of 1.6 ml, and was located ~ 1 km below the main crater.
Regarding the type of LP seismicity associated with fluid dynamics (gas and steam), the average daily attendance rate remains below 6 LP day. The highest occurrence of LP events during this period corresponds to January 11, with a maximum of five LPs low energy (
In short, the activity of Misti continues to show low levels (normal). This activity is associated with rock fracturing process (VT) and, to a lesser extent, events related to fluid dynamics (LP and tremors).
2. Satellite monitoring:
Thermal anomalies: The Mirova system (www.mirova.unito.it) from the University of Turin (Italy) has not detected thermal anomalies on the Misti volcano for that period.
Anomalies of SO2: The satellite system GSDM–NASA (http://so2.gsfc.nasa.gov/) « EOS Aura » did not notice any major SO2 gas density anomalies (magmatic gases) on the Misti Volcano .
January 28, 2016. Misti, Perou :
Source : IGP
Photos : Nature-perou.