There are earthquakes and then there are earthquakes specific to
volcanoes. In recent years, scientists have learned a great deal
about the quakes volcanoes generate, thanks in no small measure to
the work of engineer-turned-seismologist Bernard Chouet. Some
volcano quakes originate in solid rock and some in molten rock that
is trying to move through underground channels. It is the latter
type of earthquake that helped Chouet forecast the eruption of Mt.
Redoubt in Alaska and that shows promise in predicting future
eruptions.
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Sources
Chouet, Bernard A. "Long-period volcano seismicity: its
source and use in eruption forecasting."
Nature, March 28, 1996.
Manual of Seismological Observatory Practice.
http://www.seismo.com/ msop/msop_intro.html
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