Earthquake and Geological phenomenon

Earthquake noun - Shaking and vibration at the surface of the earth resulting from underground movement along a fault plane of from volcanic activity.

Geological phenomenon and earthquake are semantically related. In some cases you can use "Geological phenomenon" instead a noun "Earthquake".

Geological phenomenon noun - A natural phenomenon involving the structure or composition of the earth.

Earthquake and geological phenomenon are semantically related. Sometimes you can replace term "Earthquake" with "Geological phenomenon", this terms are similar.