I just wanted to ask how secure are the nuclear sites aginst earth quakes ? There are frequent earth quakes in Pakistan, China, India, US etc .. so are our nuclear facilities secure enough to withstand such an event, as most are under ground facilities so will they be able to survive during a earth quake ?

yes they are.

A nuclear power plant is always made by specialist. and IF it is damaged by some quake then the archietect is busted n God knows what they do to him.

Thats y archietects think 10001 times before signing the contract with the authorities.