Another explosion – Redoubt back to red 26 March 2009Posted by admin in activity reports, Alaska, eruptions, Redoubt, United States.
Tags: Alaska, Redoubt, United States, volcanic activity reports, volcanic eruptions
Another explosive event has occurred at Redoubt, reports the Alaska Volcano Observatory (update at 2009-03-26 08:52:50). It began at approximately 08:34 AKDT (16:34 GMT) and produced an ash plume that rose to 30000 feet (9100 metres). The aviation colour code has been raised once more to Red, and the volcanic alert level to Warning. AVO Volcanic Activity Notice here.
UPDATE: A further explosion is reported at 09:24 AKDT (17:24 GMT). The AVO gives the cloud height, from pilot reports, to be at least 65000 feet (19800 metres) above sea level. Fresh meltwater runoff is visible on the Hut webcam, along with pyroclastic flows and ashfall. A new AVO Volcanic Activity Notice has been issued. Anchorage VAAC have an ash advisory issued at 1750 GMT warning of ash at FL650.
AVO reports (10:54 AKDT) that the 09:24 eruption has diminished (‘though smaller events may occur, or a larger event resume’), and that this event produced a lahar down the Drift River. A flash flood warning is in operation for the river until 15:00 local time today. An ashfall advisory has been issued for the western Kenai Peninsula (AVO warns that up to 1/8th of an inch of ash, 6mm, may accumulate) but no ashfall is expected in Anchorage.
The 20km ash cloud from this event is the highest altitude yet reached in the current eruptive phase. The 1989-90 eruption produced ash to an altitude of 13.7km.
Pictures of the 09:24 event from the Hut webcam, captured at (from top down) 09:35, 09:40 and 09:44. A pyroclastic flow is visible on the left of the 09:35 picture; steam can be seen rising from its course in the 09:40 picture. The dark channels visible on the snow are meltwater and mudflows created by the heat of the eruption.
Some later pictures, from 13:24, 13:39 and 13:54, showing the eruption cloud at the summit and fresh lahar deposits:
For all our Redoubt coverage: Redoubt « The Volcanism Blog.
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