The earthquakes LP type associated with fluid movements, remained at an average of 137 LP / day, as in the previous week. Energy values generated by such events are low. In this period there have been earthquakes of type « Tornillos« , combined with the pressure of fluids in the cavities. A total of 6 « Tornillos« this week with accumulated energies below 0.2 MJ, this activity remains low. Seismicity hybrid type, associated with the rise of magma rose slightly. This week, a total of 22 events (16 hybrids in the previous period) were recorded. Similarly, an energy peak of 6.4 MJ generated on June 25, also reflects the increase mentioned above.
Events associated with fracturing rocks (VT) showed a similar behavior than in the previous period. With an occurrence of 46 VT/ day and maximum value recorded on June 25. Seismic tremor recorded by telemetry stations OVS is very often associated with the exhalations of ash observed over the volcano. This type of recording (exhalation) increased slightly during this period. Similarly, still observed harmonic tremors, which are associated with vibrations generated during the passage of fluids. These harmonic tremors were of short duration and low energy.
This week the OVS system recorded and reported four explosions that have occurred since June 24 . The most explosive episode was recorded on June 24 at 17:38 local time, generating 17 MJ of energy. Fumaroles, composed of ash and other magmatic gases, reached a maximum altitude of 3000 meters above the base of the crater being dispersed to the north, northwest, east, southeast , south and southwest of the volcano. Until the end of this technical report, the issuance of volcanic ash was generated less frequently, interspersed with periods of relative calm.
Thermal anomalies: The system Mirova detected 1 thermal anomaly of 1 MW , June 24 ,on the volcano.
01/07/2015. Ubinas, Perou :
Source : IGP.
Photo : Sgrd.pcm.gob.pe.