Replace your battery every 3-4 years. In an emergency, your car battery will need to run the radio and heater for extended periods. You must also be prepared at work, and have additional supplies in your car. Strap gas appliances to walls or floor, especially the water heater. A four hundred pound water heater will break gas lines on its way to the floor.
Gas appliances are a real danger in an earthquake, and are the cause of most fires after a quake.
The water heater is strapped to the wall. Know where to shut off the water, power, and gas and have placed the tools at each location. Make sure your house is bolted to its foundation. Repair defective electrical wiring and leaky gas connections. These are potential fire risks.