Volcanic Earthquakes

Volcanic earthquake:  There are two types of volcanic earthquakes.

Volcano-tectonic earthquake:  These earthquakes occur  when withdrawal or injection of magma takes place.  The new stress changes in the solid rock produces the earthquake.  Volcano-tectonic earthquakes can cause large cracks in the ground to be produced.  Unlike long period earthquakes [see below], volcano-tectonic earthquakes do not signal an eruption is going to happen, but rather can happen at anytime.

Long period earthquake:  When magma (molten rock) injected into the surrounding rock it creates a pressure change due to unsteady movement of the magma.  When continued earthquakes occur, these occurrences signal that the volcano is about to erupt.  Scientists then take this information and record it on seismographs.


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