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Redoubt update, 30 March 2009 30 March 2009

Posted by admin in activity reports, Alaska, eruptions, Redoubt, United States.
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A further explosive eruption was reported by the Alaska Volcano Observatory at 23:14 AKDT 29 March 2009 (07:14 GMT 30 March 2009), with a cloud top above 20000 feet/6000 metres, but is currently being reanalyzed by the AVO’s experts, according to a new update (2009-03-30 02:16:26):

We are re-analyzing the event reported as an explosive eruption occurring at approximately 23:14 AKDT (7:14 UTC). An episode of stronger tremor at the volcano was in progress when the seismic signal from a M5.4 earthquake near Kodiak Island passed through the Redoubt area causing the tremor amplitude to appear to increase quickly.

Radar did show a cloud top above 20,000 ft above sea level at approximately the same time.

Meanwhile Anchorage airport has re-opened after closing because of ashfall on Saturday afternoon. The Drift River Oil Terminal, where 6 million gallons (23 million litres) of oil is still sitting in the tanks, remains a major focus of concern: two environmental groups have written to Alaska Governor Sarah Palin asking that emergency oil-spill response equipment be positioned ready for rapid deployment in the event of any spillage.

Useful link: Mount Redoubt Volcano News is a constantly updated site that brings together coverage of Redoubt from news sites and blogs.

UPDATE: The AVO have completed their re-analysis of the 23:14 AKDT event and have concluded that it was not an explosive eruption: ‘At that time, there was heightened tremor, however, seismic and infrasound data do not show clear evidence that an explosion occurred and this will not be categorized as an explosive eruption’.

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

News
Oil at Drift River poses a spill riskAnchorage Daily News, 29 March 2009
Anchorage airport clears volcanic ash, reopensSeattle Times, 30 March 2009

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. Craig Heden - 30 March 2009

A global movie of recent SO2 emmision plumes from Redoubt can be veiwed here. http://spaceweather.com/swpod2009/30mar09/so2_gome2_anim.gif?PHPSESSID=ottmhoun5h8b28tgfp6b2kq411

Credit to Dr. Tony Phillips and Spaceweather .com


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