Here's a short list of essential items you should have in your emergency kit which should last you for at least 7 days:
Battery powered or hand cranked radio
Emergency contact list
Pet food and supplies
Don't forget to secure tall furniture, like bookcases, china cabinets, and hutches, to walls.
Often, home gas lines rupture during a major earthquake and cause fires. I'm proud to have sponsored an ordinance in Contra Costa that requires the installation of an automatic gas shut-off valve in new construction, major home remodels and at the time of sale of your home. I have one on my house. Consider one for yours.
If you're a property owner and interested in California earthquake insurance check out
this information from the state insurance commissioner.
For additional information about disaster preparedness, here are some helpful links: