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News & activity updates from Sotara volcano

Sotará volcano (Colombia): increase in seismic activity triggers raise in alert level

Thursday Aug 09, 2012 06:46 AM | BY: T

Location of the larrger recent earthquakes under Sotarà
Location of the larrger recent earthquakes under Sotarà
The summit of Sotarà volcano on an INGEOMINAS photo from Oct 2011
The summit of Sotarà volcano on an INGEOMINAS photo from Oct 2011
Current seismic signal (SOSO station) late on 8 aug
Current seismic signal (SOSO station) late on 8 aug
The recent increase in seismic activity under Sotarà volcano promted INGEOMINAS to raise the alert level from yellow (unrest) to orange (eruption warning) yesterday afternoon.
The increase had been detected on June 24, 2012 and since that date, 6891 earthquakes have been recorded, i.e. an average of 150 quakes per day. Most of them (5177) are of very small magnitude, but the remaining 1714 quakes were of significant energy (local magnitudes 0.1-2.2) and concentrated in an area between 0.1 and 5 km northeast of the volcanic summit at depths between 2 and 6 km.
None of these events were felt by inhabitants of the communities surrounding the volcano Sotará.
The deformation network shows a possible inflation process towards the northeast sector of the volcano, which correlates with the epicentral zone of seismicity reported and suggest that magma is rising there, and might (or might not) lead to an eruption in a near to medium future.
During the month of July geochemical surveys showed no significant changes in temperatures of hot springs in the area.

INGEOMINAS stresses that this activity does not pose any immediate danger to the communities aroud the volcano. However, it should be said as well that this could change quickly.
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Links / Sources:
Previous news
Seismic recording from Sotara (29 July) (INGEOMINAS)
Tuesday, Jul 31, 2012
Volcanic unrest has been detected recently at Sotara volcano. An increased number of small volcanic earthquakes is visible on seismic recordings. [more]
Sotará volcano
stratovolcano 4400+ m / 14,436 ft
Colombia, 2.11°N / -76.59°W
Current status: normal or dormant (1 out of 5)
Sotará webcams / live data | Reports
Sotará volcano books
Sotará volcano eruptions:
unknown
Typical eruption style:
explosive
Last earthquakes nearby
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