The earthquakes LP type associated with the movement of fluids, showed a slight increase during this period. The average daily number of earthquakes in this week reached 110 LP / day. Their observed energy reaches very low values.
Seismicity hybrid type, associated with the rise of magma, is always present. This week, a total of 16 events were recorded. However, the value of seismic energy generated is low (3.7 MJ / day). Events associated with fracturing of the rock (VT), increased slightly compared to the previous week. This increase has occurred since June 18, peaking at 65 VT / day. Although the energy values ??shown are in low levels. Overall sismic tremor showed a slight increase over the last three days. On June 22, there has been some tremors harmonics, associated to the vibrations produced by fluid passageway.
These harmonic tremors had an energy of short duration and low. The main feature of this period is that there was seismic signals associated with the exhalations of ash that have been duly reported (alert ash falls – ACC). The appearance of these exhalations had been the subject of Nº26-2015 report OVS – forecast section. Exhalations intensified on June 22 with a total of 8 observed exhalations, which reached up to 5.8 MJ maximum energy.
The previous report had warned that the buildup of pressure inside the volcano Ubinas produce exhalations / explosions. And indeed, many emissions have been held since June 20. Fumaroles, composed of ash and other magmatic gases, reached a maximum height of 2000 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 emission of ash on the volcano was persistent or with different exhalations or small pulses of ash. Overall, it was noted a significant increase in magmatic material expulsion.
Source : IGP
Photos : IGP, OVI