(Credit: Oliver Spalt)
According to a report released yesterday by the University of Washington, “Some volcanoes ‘scream’ at ever-higher pitches until they blow their tops. 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.”
Smithsonian’s blog has a recording of an eruption sequence from March 2009 at Alaska’s Redoubt Volcano.
Filed under: science
MEMETERIA by Thomas May 