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

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Presentation transcript:

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

Shallow Water Wave! C = √(gd)

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

Before and After

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)

Crescent City, CA Tsunami 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)