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An earthquake can be caused in two different ways, there is a volcanic earthquake and a tectonic earthquake. Tectonics earthquakes are much more common than volcanic earthquakes. Volcanic earthquakes are when magma, or molten rock, moves underground. This can cause earthquake directly in what is called a harmonic tremor, or indirectly by breaking and shifting rock.

A tectonic earthquake is when stress built up by the movement of Earth's tectonic plates is released in the form of shaking.

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9y ago
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13y ago

Because the volcano shakes the ground.

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Q: When do volcanic earthquakes occur?
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