Activity on Mount Redoubt increases

Posted: Thursday, May 07, 2009

As of 9 p.m. Wednesday, repetitive earthquakes dominated the seismic signal at Mount Redoubt, according to the Alaska Volcano Observatory.

Seismicity at the volcano intensified since Tuesday, with nearly continuous small earthquakes being recorded near the summit. Steam emissions were increasingly vigorous. Satellite data from Wednesday morning show minor ash components in plume emissions. Rockfalls also continue to trigger ash emissions near the summit.

At approximately 10 p.m. Tuesday, there was a distinct increase in seismicity, with a near doubling in the intensity of volcanic tremor and a notable increase in the number of discrete events. At the same time, steam emissions greatly intensified and were briefly accompanied by vigorous ash emissions that did not exceed 12,000 feet above sea level.

For up to the minute information, visit and follow the link to the Alaska Volcano Observatory Web site, and to the borough Office of Emergency Management Web page for emergency preparedness information.

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