Turn the Gas Off After an Earthquake
Once the shaking stops and the dust has settled, take a few moments to take stock of your situation. Do you smell natural gas? If you do there may be a leak, so its time to shut the gas main off. Bear in mind that only the utility can turn it back on, so you may have to wait a few days before you will have gas again.
How can you tell when gas is leaking? If you smell a sulfur-like rotten egg smell.
HOW TO TURN OFF GAS AFTER AN EARTHQUAKE:
Go to your gas meter and shutoff valve. We assume you have figured out where it is long before you have to turn off the gas, but if not try looking in the following places: the side or in front of the building, in that utility box on the side of your building, or if you live in an apartment building, talk to your landlord and ask him/her to show you where it is. Use that wrench you have placed by your gas main for just this purpose.