Sunday, March 29, 2009

Redoubt Volcano Eruption, 2009 - John Seach

Seismic activity increased markedly at Redoubt volcano between 23-25 January 2009. Tremor became sustained and its amplitude increased. Aviation Color Code was increased to ORANGE. A burst of volcanic tremor occurred at Redoubt volcano, Alaska on Thursday 5th February 2009 at 11:18 am (local time). The tremor lasted 4 minutes and was the most intense since January 30th. A second episode of volcanic tremor occurred just after 3:00 PM on Wednesday and lasted for about 30 minutes. No eruption accompanied the earthquakes. An eruption occurred at Redoubt Volcano on 22nd March 2009, with ash emission to 50,000 ft above sea level. The volcano produced five explosive eruptions, each lasting from four to thirty minutes. Small amounts of ash fell at Skwentna, Talkeetna, Wasilla, and Trapper Creek. A large lahar occurred in the Drift River Valley and contained ice, water, mud, and other debris, and traveled more than 35 km to Cook Inlet. An eruption on 26th March ejected ash to a height of 65,000 ft. On 27th March ash reached 32,000 ft altitude. There were 11 large eruptions in the first week of activity with ash reaching altitudes of 30,000 to 60,000 ft.
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