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Restless Redoubt rocks and rumbles, but no eruption yet 3 February 2009

Posted by admin in activity reports, Alaska, Redoubt, United States, volcano monitoring.
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North flank of Mount Redoubt and low-level vapor plume, 31 January 2009. Photographer Chris Waythomas (AVO/USGS image)
Above: North flank of Mount Redoubt and low-level vapour plume, 31 January 2009. Photographer Chris Waythomas. (Image courtesy Alaska Volcano Observatory / U.S. Geological Survey.)

Monday 2 February 2009 brought no eruption at Redoubt, but there was considerable seismic restlessness and a new overflight observed continuing signs of fumarolic activity and snow/ice melting at the summit. Over the last few hours the Alaska Volcano Observatory has reported continuing unrest, seismic activity elevated and well above background levels, and a vapour plume rising no higher than the volcano’s summit.

There was some high-intensity tremor at Redoubt early in the morning of 2 February. The AVO reported (2009-02-02 03:14:48) that a ‘high intensity burst of volcanic tremor occurred from about 2:44 through 2:50 AST … There was no eruption associated with this tremor’. A few hours later there was a report (2009-02-02 09:13:03) that a ‘short, high-intensity burst of volcanic tremor occurred at 8:47 AKST this morning, and since then a series of small repeating earthquakes is ongoing. There is no eruption associated with this earthquake activity’. The latest observations on the website are as follows:

2009-02-03 00:00:11

Redoubt Volcano remains restless. Seismic activity continues at an elevated level and is well above background levels. The volcano has not erupted.

A gas/observation overflight yesterday reported continued changes in the summit glaciers indicative of heating of the summit area. Photos from both the overflight and the hut webcam showed a small vapor plume at the summit. The web camera is now dark as our long winter night continues.

[End of AVO statement.]

Pictures from the previous overflight on 31 January 2009 are available on the AVO website. Three are reproduced here, one at the top of this post and two below, with original AVO captions.

Vigorous hot fumarolic emissions at Mount Redoubt, 31 January 2009. Photographer Christina Neal (AVO/USGS image)
Above: View of vigorous hot fumarolic emission from two holes (at about 7000 feet in elevation) through the steep Drift glacier that descends from the Redoubt summit crater to the north into Drift River Valley. The orifice on the left was first observed on January 30 during an overflight and it appears to have widened by the time this photo was taken on January 31. The orifice on the right was first seen on January 25. Water vapor and volcanic gas emanating from these holes in the ice are forming a visible white plume that rose about two thousand feet vertically, nearly to the summit of the volcano. Photographer Christina Neal. (Image courtesy Alaska Volcano Observatory / U.S. Geological Survey.)

Close-up of fumaroles below the 1989-90 lava dome, Mount Redoubt. Photographer Chris Waythomas (AVO/USGS image)
Above: Close up view of fumaroles below the 1989-90 dome. These were the most vigorously steaming fumaroles observed on 31 January 2009. Photographer Chris Waythomas. (Image courtesy Alaska Volcano Observatory / U.S. Geological Survey.)

The Anchorage Daily News has a story today on the calls the AVO has been getting from the public, understandably concerned about what the volcano is going to do, and the efforts of AVO staff to explain that a volcanic eruption is not a straightforwardly predictable event. ‘Please do everything you can to make sure the volcano doesn’t erupt until after 8 o’clock’, requested one caller, concerned about possible disruption of their flight to Hawaii.

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

News
Calls about Redoubt besiege volcano centerAnchorage Daily News, 2 February 2009
Redoubt remains restlessAlaska Dispatch, 2 February 2009
Redoubt waiting game continues – KTUU, 2 February 2009
Will volcano blow? Expert waits, watches, ready to warn – CNN, 2 February 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

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Comments

1. anhiohs - 19 March 2009

what type of rock does mount redoubt have?


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