VT type Earthquakes or fracture showed peaks of activity on 06 and 11 July, with the recording of maximum energy values of 5.2 MJ. Apart from these events, the activity observed in the last fortnight, indicating a downward trend of these values. The calculated power of such VT events in this period is on average only 01 megajoules per day. Therefore, seismicity related to rock fracturing remains low.
The type of LP seismicity associated with fluid dynamics (gas and steam), maintains a low occurrence rate in the day, with an average of 7 LPs / day. On July 11, a resultant value of this activity has helped to recorded 14 events. The calculated energy shows minimum values. For its part, the tremor activity remains low, except for a slight increase recorded on July 12, which reached 21 minutes. During this period, were observed 6 minutes of tremor per day.
The events location map generated during the period of 1 to 14 July 2015 shows an overall distribution of earthquakes on a NNW-SSE axis, up to 1 km from the crater. This activity is between 0.5 to 2.0 km depth below the surface of the crater. The maximum recorded was magnitude 2.9 ML and corresponds to the event that took place on July 11 at 6:11 HL.
July 17, 2015. Misti , Perou :
Source : IGP Perou .
Photo : Nicolas Beuchat