Tungurahua (Ecuador): Following more than 2 months of calm, the volcano is probably about to enter a new eruptive phase, a special bulletin of Ecuador’s Geophysical Institute (IGPEN) informs.
Following a steep increase in seismic activity last Sunday afternoon, a small ash emission occurred at 15h49 local time, producing a plume rising approx. 1 km and causing light ash fall.
The black color of the ash suggests that it originated from a new batch of fresh magma that started to arrive in the summit crater.
Since Sunday evening, the volcano’s seismic activity has continued to increase, in particular with regards to so-called long period earthquakes, believed to be signs of fluid movements (magma, gasses, water) inside the volcano. The observed seismicity is somewhat similar to the precursor activity that preceded the eruptions of Tungurahua in February and April this year. Surface activity could for most of the time not be observed due to bad weather.
More at Volcano Discovery: Volcanoes Today, 30 Jul 2014: Tungurahua