Volcanic 

Earthquakes

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A Volcanic Earthquake is when, drying quickly, acidic lava, produced by the volcano, blocks the top of the volcano. Now, normally escaping lava, cannot escape, which builds up pressure inside the volcano. Acidic lava, eventually, can't stand stand the pressure of the magma, so free to explode pressure is released so quickly that it causes an earthquake. 10-20 miles of the volcano is what a volcanic earthquake is usually kept within.