Seismic rattles and rolls at Redoubt 21 March 2009Posted by admin in activity reports, Alaska, Redoubt, United States, volcano monitoring.
Tags: Alaska, Redoubt, volcanic activity reports, volcano monitoring
Mount Redoubt has been going through some interesting seismic evolutions over the last 24 hours. From around 00:00 to around 08:00 GMT on 20 March (around 16:00-00:00 on 19 March, local time) there was a period of marked volcanic tremor. The amplitude of the tremor diminished subsequently, but a pattern of small discrete quakes (around 1-2 per hour) interspersed with occasional larger seismic events continued, with the smaller quakes increasing in frequency and amplitude from around 10:00 local time. The RSO webicorder trace shows all this clearly:
These small quakes are probably caused by localized rock fractures as magma moves at depth within the volcano. All this indicates that Redoubt is an active, restless volcano – which we knew already.
For all our Redoubt coverage: Redoubt « The Volcanism Blog.
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