Sunday at 4:33 am (Fig. 1), an medium explosion of Tungurahua volcano was recorded. At Juive , an observer reported hearing rolling of blocks on the side of the volcano and looking through the clouds seen incandescent material. From the OVT, it was observed some of these glowing blocks on the western flank, extending over 1000 m below the crater rim. He has been associated heard any noise. Subsequently, from 5:14, observers from Chacauco, Cotaló and Manzano began reporting falls of ash in their sectors. They said they were black and red and about the size of a sugar.
After the main explosion occurred, surveillance instruments on the volcano showed the presence of a seismic tremor that lasted shortly before another explosion took place at 7:53, which was smaller than the last. There was no noise that was associated with it.
This activity presents in the previous days showed an increase in internal activity of the volcano. During the 20 and 21 October , 140 and 167 earthquakes long period (LP, associated with the movement of internal fluids) were recorded. In the following days the number of earthquakes gradually decreased (27 events on October 24), this until today when the events listed above occur. This is an activity model whose the volcano has demonstrated for several weeks.
On the development and continuation of the activity of the volcano, the IG will continue to report into daily and extraordinary reports.
October 27 , 2015. Tungurahua, Equateur :
Source : IGEPN
Photo : José Luis Espinosa Naranjo . ( 2012)