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The largest tsunami to affect California was 3/28/64 after the 9.2 earthquake in Alaska. Since that time the easily available resources for information & understanding have increased
- Tsunamis - California Dept of Conservation Announces Updated and New Tsunami Products
- California Tsunami Maps
- State of California's Update to the Tsunami Inundation Maps for Evacuation Planning, 2019
- Los Angeles County Tsunami Hazard Areas
- Tsunami Hazard Area -The Tsunami Hazard Area (shaded yellow on map) was prepared to assist cities and counties in identifying their tsunami hazard for tsunami response planning. The hazard area represents the maximum considered tsunami runup from several extreme, infrequent, and realistic tsunami sources. These data are intended for local jurisdictional, coastal emergency planning uses only.
- Cal MyHazards - MyHazards is a tool for the general public to discover hazards in their area (earthquake, flood, fire, and tsunami) and learn steps to reduce personal risk. Using the MyHazards tool, users may enter an address, city, zip code, or may select a location from a map.
- U.S. Tsunami Warning Centers -
- Pacific Tsunami Warning Center (PTWC) - Official tsunami warning capability in the U.S. began in 1949 as a response to the 1946 tsunami generated in the Aleutian Islands that devastated Hilo. The U.S. federal government already had a sizable piece of property in ʻEwa Beach to house the Honolulu Geomagnetic Observatory. The Tsunami Warning Center was co-located with this facility, which is maintained by PTWC staff today.
- National Tsunami Warning Center (NTWC) - October 1, 2013 the West Coast and Alaska Tsunami Warning Center became the National Tsunami Warning Center (NTWC)
- To learn more about what is involved in becoming TsunamiReady, visit
- TsunamiReady® Communities As of March 8, 2024, there were:
200 TsunamiReady Communities* in 16 U.S. states and territories
21 TsunamiReady Supporters - Historical Context | National Oceanic and Atmospheric Administration
- On average, two tsunamis cause damage near their source each year
- The December 26, 2004 earthquake, with a magnitude 9.1, occurred off the coast of the Indonesian island of Sumatra in the Indian Ocean. It generated a tsunami with a 167 feet (51 meters) height. Flood occurred up to three miles (five kilometers) inland.
- The Global Historical Tsunami Database contains information about over 1,200 confirmed tsunamis between 1610 BC and AD 2017. Of these, at least 250 were deadly. Here are the ten deadliest tsunamis on record. Historical Context | National Oceanic and Atmospheric Administration
- BE PREPARED FOR A TSUNAMI
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