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Before a volcanic eruption can happen, magma has to migrate form depth into the volcano's magma chamber. This movement of magma inflates the ground round the volcano, and provided the energy to initiate earth movements which cause a swarm of earthquakes.

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12y ago
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12y ago

They are caused by movements of magma below ground as pressure is about to be released by the volcano.

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15y ago

It's probably due to all that lava pushing its way up through all that rock.

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Q: Why do earthquakes frequently preceede volcanic eruptions.?
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