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Redoubt rumbles reducing 2 January 2010

Posted by admin in activity reports, Alaska, Redoubt, United States.
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Alaska’s Redoubt volcano seems to be calming down after its recent burst of seismic activity, which led to an increase in the alert level to Yellow/Advisory on 28 December 2009. The weekly bulletin issued on 1 January 2010 by the Alaska Volcano Observatory reports that the ‘swarm of shallow, small earthquakes that began last Sunday, December 27 at Redoubt Volcano has greatly diminished or ceased’, and that an aerial inspection on 31 December showed no changes in the appearance of the volcano and no sign of instability at the lava dome. Surface temperatures at the dome remain high, in line with expectations, while magmatic gas output from the dome area ‘is somewhat elevated compared to the last measurement in early November’.

The scientists at the Alaska Volcano Observatory are continuing to examine what might have caused the recent activity: one possible cause is ‘input of new magma or remobilization of existing magma within volcano’s shallow plumbing system’. AVO notes that the process ‘appears to have ceased or paused’, but may reappear and possibly lead to additional eruptive activity, although the ‘sharp increase in seismicity and other marked changes prior to such activity’ would provide some warning of what was going on. For the moment AVO is keeping a close watch on things, and Redoubt remains at Yellow/Advisory.

Redoubt rumblings continue to ease, scientists say – KTUU.com, 1 January 2010
Flyover shows Redoubt appears unchangedAnchorage Daily News, 1 January 2010

Global Volcanism Program: Redoubt – summary information for Redoubt (1103-03-)
Alaska Volcano Observatory – Redoubt – AVO information and updates for Redoubt
Alaska Volcano Observatory – main page for the AVO

The Volcanism Blog

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