Tsunami

A strong earthquake lasting 20 seconds or more in the Pacific Ocean region could generate a tsunami. A noticeable rapid rise or fall in coastal waters is a sign that a tsunami is approaching. Tsunamis most frequently come onshore as a rapidly rising turbulent surge of water choked with debris.
In response to a tsunami move inland or move to higher ground immediately.
Do not go to watch the waves or try to surf a tsunami.
Stay away from the beaches and the Bay until local authorities have told you that it is safe to return.