Question

sources of earthquake

Answer 1

Hey there!

The earthquake source if where the seismic waves originate from. 

Thank you!

Answer 2

Earthquakes are caused mostly by rupture of geological faults, but also by other events such as volcanic activity, landslides, mine blasts, and nuclear tests. An earthquake's point of initial rupture is called its focus or hypocenter. The epicenter is the point at ground level directly above the hypocenter.