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Before it erupts, a volcano produces many thousands of
earthquakes. Some of these happen when rock inside the volcano
cracks or slips along a fault. Others are caused by magma
(molten rock) and gases trying to move under pressure within
channels and cracks.
Select from the links below to find out about the four primary
types of volcano-related earthquakes and to see the seismic
signals that they produce. (The movement of a signal from one
peak to the next is equal to one cycle.)
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