Originally published on July 19, 2013

Scientists at the University of Washington have discovered what they have dubbed a 'seismic scream' that precedes explosive volcanic eruptions. Readings taken from Alaska's Redoubt volcano prior to a 2009 eruption recorded a series of tremors around 2km below the crater. This swarm of 1,600 or so 'drumbeat' earthquakes took place in the ten hours before the first explosion.

The tremors then increased steadily in frequency and occurrence, eventually blurring into a continuous stream. The noise peaked around 30 seconds before the eruption.
The scientists believe the sounds are caused by the rapid slipping of many small faults near the conduits of molten magma as pressure builds up ahead of the eruption.

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