Increase of internal activity.
After what has been reported in the last newsletter of the Tungurahua volcano, No. 19, published on November 11, 2015, the activity showed a significant increase compared to the numbers of events in the preceding week. At a superficial level, it s’ is expressed by continuous ash emissions mainly to the Southwest and Northwest. This caused one of the biggest ash fall since 2010, affecting many cities , agriculture and livestock. Based on this activity, the SGR has declared an orange alert in these areas.
From 19:00 (local time) Tuesday, November 24, was recorded a swarm of earthquakes LP type (fluid movements), accompanied by tremor of emission, which began at 21:00 (TL) and lasted about an hour. At the surface, a continuous emission of water vapor and gas with a very low ash content was observed. This issue did not exceed 800 m above the crater and headed westward through the action of winds.
From 1:00 (local time) today, it was clearly noted an increase in the number and magnitude of LP type earthquakes. The same situation continued until the end of this report. There were approximately 582 events, with an average of 34 events per hour recorded at 11:00 am.
This remarkable increase of the inner volcanic activity is related to the continuous movement of fluid (gas and magma) and is recorded mainly by the seismic station near the crater, which can be described as a shallow internal activity. However, this increase has not resulted in a change in the surface activity, which maintains a column of steam at the crater, little energetic, consisting of water vapor and gas.
It is expected that if a fluid elevation (optionally magma) into the conduit, it may produce variable size explosions, whose energy and vibration levels would be rising sharply.
Therefore, the Geophysical Institute, from early morning reported the increase in activity to authorities, to SGR and observers of the volcano Tungurahua (community leaders) to keep an eye on changes that may occur .
The Geophysical Institute maintains a permanent monitoring of the evolution of the activity of the Tungurahua volcano, any level of internal changes or surface activity will be presented in a new report.
December 01, 2015. Tungurahua, Ecuador :
Source : IGEPN
Photo : Vásconez F