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Two bursts of tremor at Redoubt 6 February 2009

Posted by admin in activity reports, Alaska, Redoubt, United States, volcano monitoring.
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The Alaska Volcano Observatory reports two bursts of intense tremor during 5 February 2009, the first of which (at 11:18 local time) we posted about earlier, the second at just after 15:00 local time. The AVO statements about these episodes are as follows:

2009-02-05 14:46:42

Unrest at Redoubt Volcano continues. Seismic activity remains elevated well above background levels.

AVO seismometers recorded a burst of more intense tremor at 11:18 this morning lasting for about 4 minutes. Radar and pilot observations confirmed that no eruption occurred. Following this burst, background tremor has remained elevated relative to the past several days.

Web camera and satellite images from this morning have been obscured by clouds.

2009-02-05 17:21:56

A burst of volcanic tremor occurred just after 3:00 PM this afternoon lasting for about 30 minutes and is continuing at a sustained but lower level. This did not result in any eruptive activity and no ash emission has occurred.

AVO is monitoring and evaluating the situation closely.

Redoubt is still at aviation color code ORANGE and volcano alert level WATCH

2009-02-05 19:17:13

Unrest at Redoubt Volcano continues. Seismic activity remains elevated well above background levels. The volcano has not erupted.

Seismometers recorded two strong bursts of tremor today. NWS radar, pilot reports, and a brief web camera glimpse of the volcano late this afternoon showed no evidence of any eruptive activity.

AVO is monitoring and evaluating the situation closely.

Redoubt is still at aviation color code ORANGE and volcano alert level WATCH

[End of AVO statements.]

Subsequent reports (2009-02-05 21:21:36) say that ‘Seismic activity remains elevated well above background levels’ and that no eruption has occurred.

The bursts of tremor can clearly be seen on the webicorders for the RDN, REF and RSO seismic stations. The following excerpts show the seismic traces for 5 February 2009 from around 18:30 UTC (09:30 local time).

RSO Webicorder
Above: RSO webicorder, showing tremor episodes in the upper part and seismicity remaining elevated subsequently. The RSO station is very close to the volcano’s summit and the tremor is very marked.

RDN Webicorder
Above: RDN webicorder. The RDN station is 6km from Redoubt’s summit, the most distant of these three stations.

REF Webicorder
Above REF webicorder. The REF station is about 3km from Redoubt’s summit.

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

Comments

1. Jodie Mclean - 6 March 2009

9pm
WE just had a tremmor here in Rowville 25 km East of Melbourne.
Strong anough to think ther was a ghost under the table.


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