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Redoubt erupting again 27 March 2009

Posted by admin in activity reports, Alaska, eruptions, Redoubt, United States.
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Redbout AVO Hut Webcam, 26 March 2009, 18-09-12
View from the AVO Hut Webcam, 18:09 AKDT, 26 March 2009, showing vigorous steaming from the summit crater (image courtesy AVO/USGS).

Yesterday’s 09:24 AKDT eruption of Redoubt was followed by a period of vigorous steaming from the summit crater and elevated seismicity characterized by lots of short sharp earthquakes and intermittent episodes of volcanic tremor. Radar data indicated that small amounts of ash were possibly present in the steam plume at times, but there were no further large-scale ash emissions for the rest of the day (summary from updates on the Alaska Volcano Observatory Redoubt page).

Seismicity began to increase in the late afternoon and evening, with increasingly frequent discrete earthquakes; this seismicity became very intense from around 23:30 local time (07:30 GMT), and at around 23:48 local time a new eruption began, confirmed by the AVO in their Volcanic Activity Notice of 2009-03-27 00:00:37. The eruption cloud height indicated by National Weather Service radar is 38000 feet (11600 metres). At 00:55 the AVO reported that an explosive series of eruptive events was continuing.

Redoubt REF Webicorder trace, 26 March 2009 (AVO/USGS)
Excerpt from Redoubt REF Webicorder trace covering approximately 07:30 26 March 2009 to 00:53 27 March 2009 (local time). The red arrows, added to the original trace, show the approximate onsets of the three explosive events during this period.

For all our Redoubt coverage: Redoubt « The Volcanism Blog.

Information
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