Redoubt stirs as lava dome continues to grow 4 May 2009Posted by admin in activity reports, Alaska, Redoubt, United States.
Tags: Alaska, Redoubt, United States, volcanic activity reports
Mount Redoubt had a restless Sunday, showing a marked increase in seismicity which included ‘more frequent rockfalls and small LPs [Long Period earthquakes]’, reports the Alaska Volcano Observatory. This kind of seismic pattern is consistent with the lava dome coming under increased structural strain as it grows – the volcano may be moving towards a dome collapse. The presence of ‘a persistent thermal anomaly’ at the dome indicates that fresh magma is still being introduced, feeding active growth.
The latest AVO bulletin for Sunday (2009-05-03 21:08:50) reported that ‘A vigorous steam plume, rising to altitudes up to 18,000′ [5500 metres] above sea level, has been visible in webcam images throughout the day. Currently, this plume contains small amounts of ash based on web camera views, satelite data, and a pilot report. Seismic activity has also increased in the last 24 hours’.
Recommended viewing: Akira Shirakawa has compiled a neat video showing the growth of Redoubt’s lava dome from 16 April to 1 May, which can be seen at YouTube (HD version also available).
For all our Redoubt coverage: Redoubt « The Volcanism Blog.
Activity at Redoubt increasing as steam plume grows – KTUU, 3 May 2009
Alaska volcano shows increased unrest – Associated Press, 4 May 2009
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