Once in the open, stay there until the shaking stops. Move to a clear area away from buildings, trees, overpasses, or utility wires. Once the shaking has stopped, proceed with caution. Avoid bridges or ramps that might have been damaged by the quake. Although smaller than the main shock, aftershocks cause additional damage and may bring weakened structures down.
Aftershocks can occur in the first hours, days, weeks, or even months after the quake.
Help injured or trapped persons. Give first aid where appropriate. Do not move seriously injured persons unless they are in immediate danger of further injury. Call for help. Listen to a battery-operated radio or television for the latest emergency information.