Well it looks like we have two shaking coasts now and believe me your brothers and sisters on the west side feel your fear and apprehension even if some of us are teasing you for tripping over a 5.9. Not me even after having been through several of them they still make my anus pucker so tight you could turn coal into diamonds up there.
Go check your water heater. Those things hop around in an earthquake so much so that we have laws stating they have to be strapped to something solid. They come loose from their gas supplies and the potential for leaking is great.
If you smell gas, turn off the gas from your house supply and under no circumstances turn it back on yourself wait for the gas company.
Got introduced to that lizard brain didn't you? Nothing like feeling the entire earth move to get you in touch with your instincts.
1:16 PM PT: Some additional good advice from comments and h/t to Chimpy.
Before you go inside a home you suspect of being damaged
If you're at work, and you're about to head home soon, remember to check a few things before you even go inside. There's some general advice on disasters from FEMA, and quakes in particular.
Short answer: make sure stuff doesn't explode or fall on you. Check the chimney, that's a good indicator of shaking. Especially if the house has a brick facade, look for warping and sagging of surfaces, and for cracks around window & door corners. If you smell gas, shut it and the electricity off from outside if possible. Don't force a door open if it seems stuck, since it might be holding the rest of the house up.
If you can, you'll want to team up with a neighbor to back each other up on the first inspection.
http://www.fema.gov/...
http://www.fema.gov/...