Cotopaxi volcano (Ecuador): new eruption with powerful explosions
Sun, 16 Aug 2015, 11:11 | BY: T
Eruption from Cotopaxi on 14 Aug (photo: Daniel Salazar / twitter)
The first explosion on 14 Aug occurred at 10:50 local time with an ash plume that rose approx. 8000 meters above the summit crater. During the same day, it was followed by 5 more explosions of similar or smaller size. Some of the explosions produced pyroclastic flows.
The volcano calmed down a bit during yesterday, but had another explosion in the afternoon.
The Ecuadorian government has declared a state of emergency for the area around the volcano and ordered evacuations. During 14 Aug, more than 400 people were evacuated from Loreto del Pedregal village on the northern foot of the volcano.
Precursors of the eruption:
The eruption had been preceded by a brief seismic crisis that started on 13 Aug and culminated in two smaller, probably phreatic explosions at 04:02 and 04:07 in the early morning the same day. Ash from the explosions, which were not observed, but heard, drifted NW and reached up to 40 km distance towards the capital Quito, where it was found as a dusting of fine ash.
During April-June, the volcano had experienced a prolonged period of seismic unrest, with more than 3000 earthquakes during May. This crisis had faded by the beginning of August, but now becomes clear to have been a precursor of the current eruption.
Whether the eruption involves new magma or is purely phreatic in origin remains unclear, but ash analysis will probably give an answer soon.
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Wed, 12 Aug 2015, 06:00
Cotopaxi volcano (Ecuador) - Smithsonian / USGS Weekly Volcanic Activity Report for 12 August-18 August 2015 (New Activity / Unrest)
On 14 August IG reported an earthquake swarm at Cotopaxi that began at 1721 and ended at 1806; the largest event, detected at 1723, was a M 2.7. A series of phreatic explosions on 15 August started with two small ones detected at 0402 and 0407. According to the Washington VAAC, ash plumes rose to altitudes of 12.2-13.7 km (40,000-45,000 ft) a.s.l.; lower parts of the plume drifted E and higher parts drifted SE. ... Read all
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