First take care of your own situation. Remember your emergency plans. Aftershocks may cause additional damage or items to fall, so get to a safe location. Take your disaster supplies kit.
If you are trapped by falling items or a collapse, protect your mouth, nose, and eyes from dust. If you are bleeding, put pressure on the wound and elevate the injured part. Signal for help with your emergency whistle, a cell phone, or knock loudly on solid pieces of the building, three times every few minutes. Rescue personnel will be listening for such sounds.
Once you are safe, help others and check for damage. Protect yourself by wearing sturdy shoes and work gloves, to avoid injury from broken glass and debris. Also wear a dust mask and eye protection.
"EVERYONE WILL PANIC DURING THE BIG ONE!"
A common belief is that people always panic and run around madly during and after earthquakes, creating more danger for themselves and others. Actually, research shows that people usually take protective actions and help others both during and after the shaking. Most people don't get too shaken up about being shaken up!
Fire. If possible, put out small fires in your home or neighborhood immediately. Call for help, but don't wait for the fire department. Gas Leaks. Shut off the main gas valve only if you suspect a leak because of broken pipes or the odor or sound of leaking natural gas. Don't turn it back on yourself - wait for the gas company to check for leaks. The phone book has detailed information on this topic. Damaged Electrical Wiring. Shut off power at the main breaker switch if there is any damage to your house wiring. Leave the power off until the damage is repaired. Broken Lights and Appliances. Unplug these as they could start fires when electricity is restored. Downed Power Lines. If you see downed power lines, consider them energized and stay well away from them. Keep others away from them. Never touch downed power lines or any objects in contact with them. Fallen Items. Beware of items tumbling off shelves when you open closet and cupboard doors. Spills. Use extreme caution. Clean up any spilled medicines, drugs, or other non-toxic substances. Potentially harmful materials such as bleach, lye, garden chemicals, and gasoline or other petroleum products should be isolated or covered with an absorbent such as dirt or cat litter. When in doubt, leave your home. Damaged Masonry. Stay away from chimneys and walls made of brick or block. They may be weakened and could topple during aftershocks. Don't use a fireplace with a damaged chimney. It could start a fire or let poisonous gases into your home.