Yes, "earthquake" is a compound noun consisting of the words "earth" and "quake" combined to refer to the shaking or trembling of the ground due to tectonic movements.
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Earthquake is a noun. It refers to a sudden and violent shaking of the ground caused by movements within the earth's crust.
Earthquake Earthworm Earthbound Earthling
Some compound words beginning with 'earth' are: earthbound, earthenware...
A foreshock is a smaller earthquake that precedes a larger earthquake. It occurs as the Earth's crust adjusts to the stress building up before the main earthquake event. Foreshocks can help seismologists predict the likelihood of a larger earthquake occurring.