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Our Hazardous Environment GEOG 1110 Dr. Thieme

Lecture 6: Tsunamis. Our Hazardous Environment GEOG 1110 Dr. Thieme. Japanese for "large harbor wave" catastrophic impacts occur thousands of kilometers from geologic source Four possible causes earthquake (along subduction zone) underwater landslide collapse of a volcano asteroid impact.

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Our Hazardous Environment GEOG 1110 Dr. Thieme

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  1. Lecture 6: Tsunamis Our Hazardous EnvironmentGEOG 1110Dr. Thieme

  2. Japanese for "large harbor wave" catastrophic impacts occur thousands of kilometers from geologic source Four possible causes earthquake (along subduction zone) underwater landslide collapse of a volcano asteroid impact Tsunami

  3. Subduction Zone

  4. Indonesian Tsunami • Indian and Australian plates • eastward subduction beneath Eurasian plate • "stick-slip" of subducting plates • M 9.1 Earthquake on December 26, 2004

  5. Banda Aceh • provincial capital on northern Sumatra • shaking by earthquake • pummeling waves • flooding after land subsided

  6. Distant vs. Local • water depth varies as wave departs epicenter • wave splits into • "local" tsunami along adjacent coast • "distant" tsunami in deep water

  7. Local Tsunami • 1993 in Sea of Japan • 15-30 m waves struck Okushiri Island • arrived only 2-5 minutes after earthquake • 120 people killed

  8. Tsunami Warning System • "buoys in the ocean" • depth gauges • water pressure recorder on sea bottom • also need PUBLIC EDUCATION ! !

  9. Tsunami Runup Map

  10. Tsunami Hazard Map • indicates possible areas of wave impact • based upon elevation • slope of sea bottom • orientation of coast

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