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Tuesday, July 16, 2013

Some volcanoes 'scream' at ever-higher pitches until they blow their tops

Some volcanoes 'scream' at ever-higher pitches until they blow their tops
Seattle WA (SPX) Jul 16, 2013 - It is not unusual for swarms of small earthquakes to precede a volcanic eruption. They can reach a point of such rapid succession that they create a signal called harmonic tremor that resembles sound made by various types of musical instruments, though at frequencies much lower than humans can hear. A new analysis of an eruption sequence at Alaska's Redoubt Volcano in March 2009 shows that ... morehttp://www.terradaily.com/reports/Some_volcanoes_scream_at_ever_higher_pitches_until_they_blow_their_tops_999.html

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