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California Tsunami Program: Understanding the Threat and Mitigating Risks

Learn about tsunamis in California, how earthquakes create them, the challenges they pose, and how to predict and mitigate the risk. Explore the tectonic context, tsunami waves, and the role of NOAA in monitoring and warning systems.

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California Tsunami Program: Understanding the Threat and Mitigating Risks

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  1. California Tsunami Program Richard Eisner, FAIA, Administrator OES Coastal Region & Tsunami Program

  2. Tsunami-Hits-Pantong-Beach-and-Banda-Ache

  3. Plate Boundary Earthquakes

  4. M9.3 Earthquake in Sumatra

  5. Travel Times

  6. Tectonic Context

  7. Tectonic Cross Section

  8. How Do Earthquakes Create Tsunamis? • Rapid Sea Floor Deformation and Vertical Displacement • Ocean Above Deformation is Displaced • Waves Form As Displaced Water Levels • Waves Propagate Across Ocean

  9. Non-Tectonic Tsunamis • Landslides • Monterey Bay • Palos Verdes • Santa Barbara • Catalina Island • Undersea Volcanoes • Meteors

  10. What is a Tsunami Wave? • Long Wave Length (>100km) • Long Period (>1 hour) • High Speed (>700 km/hour) • Little Energy Loss Over Great Distance • Grows in Shallow Water

  11. Tsunami Inundation

  12. Challenges • Uncertainty • Unpredictability • Possible Warning? • Limited Mitigation Options to Reduce Risk • Systems Depend on State and Federal Support BUT Local Lead • Infrequency -- Recurrence (?)

  13. Prediction and Warning • How Do You Describe The Threat • A Physical Model for Phenomenon by NOAA • Scientific Review by NOAA • Where? • How Big? • Probability of Occurrence? • When? • Impact and Protective Measures?

  14. Will There Be A Tsunami? • Tsunami-genesis Inferred From Earthquake • Magnitude • Location • Mechanism • Historic Record • Tsunami Confirmed by Tide Gages • Distant • In Harbors • And Mid-Ocean NOAA Buoys (DART)

  15. Deep Ocean Assessment and Reporting of Tsunamis (DART) Or “Tsunamometers”

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