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

Sunday, July 14, 2013 - 12:30 in Earth & Climate

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.

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