Question

what is relation between dam and earthquake

Answer 1

Both of them produces energy.

one by using potential energy and other by movement of crust plates.

Answer 2

Dams by itself do not cause any earthquake. The purpose of any dam is to impound the flowing water. This leads to formation of reservoir in which a large portion of land is submerged along with the river course on which the dam is made.

This leads to increase in the pore-water-pressure of that area.