Volcanic 'scream' precedes explosive eruptions (BBC)

[eppur_se_muova]

By Simon Redfern
BBC News

A change in the frequency of earthquakes may foretell explosive volcanic eruptions, according to a new study.

The seismic activity changes from steady drum beats to increasingly rapid successions of tremors.

These blend into continuous noise which silences just before explosion.

The study of tremors in the lead up to the 2009 eruption of Redoubt, a volcano in Alaska, appears in Journal of Volcanology and Geothermal Research.

Those quakes continuously rose in pitch like a volcanic glissando - a musical glide from one pitch to another.
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more: http://www.bbc.co.uk/news/science-environment-23317368

Hear the "scream" here:
http://soundcloud.com/uw-today/redoubtscream
(ignore the notice that you need an update)

[kestrel91316]

1. Not sure how helpful that 3 minute advance warning would prove........

[Thor_MN]

2. hmmm... sped up 60 times, probably sounds different at slower speeds

The Earth breaking lava...