Earthquakes around volcanoes are not an uncommon occurence. In fact they may be used to predict an eruption.
There are two types of volcanic earthquakes: volcano-tectonic earthquakes and long period earthquakes.
A volcano-tectonic earthquake is caused by the injection or withdrawl of magma from solid rock, creating stress. A long period earthquake is when magma is injected into the surrounding rock and is sustained, indicating high gas pressure; these are the earthquakes that may predict an eruption.
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