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Tsunami Crash Course

This comprehensive overview explores the dynamics of tsunamis, including their formation in shallow water and how bathymetry influences wave behavior. It emphasizes the importance of early warning systems like DART for predicting tsunami arrivals and highlights real-life cases, such as the devastating 8-foot waves in Sendai and the 22-foot outcome from the 1964 Alaskan earthquake. For those in tsunami-prone areas, the essential safety measure is to seek high ground quickly, especially on the U.S. West Coast, including Washington and Oregon.

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Tsunami Crash Course

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  1. Tsunami Crash Course Images from UNESCO IOC Brochure: Tsunami: The Great Waves

  2. Shallow Water Wave! • C = √(gd)

  3. Similar to surge, much depends on bathymetry Deep water Near shore

  4. Before and After

  5. Warnings: • If close to event center, only defense is to head for high ground (U. West Coast, esp. Wash/Ore.) • Sometimes there is time to warn, or at least cancel warnings (DART)

  6. Crescent City, CATsunami Magnet • Offshore Bathymetry (underwater Topography): Mendocino Fracture Zone • Shape of near-shore shelf • Shape of coastline itself • 8 Feet in Sendai Tsunami • 22+ feet in 1964 (from Alaskan Earthquake)

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