Announcing Updated and New Tsunami Products

January 31, 2022

The Tonga Tsunami of January 15, 2022

Our summary of effects in California, and the state's response.

Decorative map of California

July 2021

New Tsunami Maps for California

We now have updated tsunami hazard area maps for 13 of the state's 20 coastal counties. The latest maps cover the counties of Orange, Santa Barbara, San Luis Obispo, San Francisco, Santa Clara, and Contra Costa.

Earthquake intensity map showing the level of shaking people felt in different parts of Japan.

March 11, 2021

The 2011 Tōhoku-oki Earthquake and Tsunami

A scientific perspective of the event, including details of what happened in Japan and subsequently in California.

A city destroyed by the Tōhoku tsunami.

March 11, 2021

California Remembers the 2011 Japan Earthquake and Tsunami, Part 1

This first installment in our three-part retrospective examines the 2011 event, and the lessons California learned that are helping us prepare for the next one.

An intact house floating in the ocean. Washed out to sea by the Tōhoku tsunami.

March 11, 2021

California Remembers, Part 2: Impacts in Japan

Explore the impacts from the earthquake and tsunami in Japan with an in-depth and unique perspective from California tsunami scientists.

A California beach community.

March 11, 2021

California Remembers, Part 3: Impacts in California

Discover how the 2011 tsunami impacted California and set the course for improvements to tsunami resiliency.

Browse all of our Tsunami Products

Recommended content from some of our Partners

Get Tsunami Alerts

National Oceanic and Atmospheric Administration tsunami web site

at the NOAA tsunami web site

Get the latest TsuInfo Alert Newsletter

TsuInfo Alert Newsletter

Partner Highlight

Redwood Coast Tsunami Work Group web site

A partner of the California Tsunami Program, the Redwood Coast Tsunami Work Group offers a wealth of tsunami‑related content.

About the California Tsunami Program

The California Tsunami Program (CTP) is a collaboration between the the California Geological Survey (CGS) Tsunami Unit, the California Governor’s Office of Emergency Services (Cal OES), and entities at the local level (counties, cities, community workgroups). For tsunami hazard mapping, the CTP works closely with the Tsunami Research Center at the University of Southern California and others to produce statewide Tsunami Hazard Area Maps and preparedness information for California. The CGS is also the scientific representative for California on the National Tsunami Hazard Mitigation Program Coordinating Committee, a state and federal cooperative responsible for developing policies and standards for tsunami mitigation efforts in the United States and its territories.

How to Contact Us

California Geological Survey Tsunami Unit

California Geological Survey Tsunami Unit. The California Geological Survey is a division of the Department of Conservation.

Cal OES Tsunami Program

California Governor's Office of Emergency Services

Preparation • Response • Recovery • Mitigation

Web page by:
California Seismic Hazards Program

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