Actualité volcanique, Articles de fond sur étude de volcan, tectonique, récits et photos de voyage
Par Bernard Duyck
Since July 28, the activity of Tungurahua is rising. On 29.08, the volcano emitted steadily water vapor from the crater.
On 1 August, from 10 h30, three small plumes rising, moderately loaded in ash, two kilometers high ... followed at 14:50 local, by a significant release of ash, formed a plume 4,000 meters before heading to ONO.
SO2 emissions are rising, with 30 and 31 July respectively 2966 tonnes / day and 1963 t / d , in relation to the presence of fresh magma in the upper volcano conduits.
The level of seismicity is up too, with tremor for two days and on 1 August, a volcano-tectonic earthquake of magnitude1, 9 to a depth of 5 km. ,presumably related to fracturation of rock.
The OVT indicates a high probability of a large explosion in the short term, probably accompanied by pyroclastic flows in drainage, up to inhabited areas and significant ash falls.
Source : IGEPN - special information 01.08.2014
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