the vibration of earth produced by the rapid release of energy

yes that is right thhere was an earthquake in dominican republic in 1946

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These are smaller earthquakes that happen after a larger earthquake. We call them after shocks because they always come after and are usually smaller.

Earthquake foci can be used to mark the earths plate boundaries . The movement along the plate boundary causes the earthquake. Knowing where the foci is can help predict future earthquakes in that scientists can monitor the area for shifts in the plates.