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Tsunami

Tsunami. Series of very long-wavelength waves on the ocean. Tsunami. = "tidal wave" Tsunami has nothing to do with tides. Video clip: Tsunamis. Tsunami waves. Very small out in the open ocean Amplitude of only ~ 1 meter Very long wavelengths (up to 100 km)

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Tsunami

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  1. Tsunami Series of very long-wavelength waves on the ocean

  2. Tsunami • = "tidal wave" • Tsunami has nothing to do with tides

  3. Video clip:Tsunamis

  4. Tsunami waves • Very small out in the open ocean • Amplitude of only ~ 1 meter • Very long wavelengths (up to 100 km) • Travel very fast (as much as 500 mph)

  5. Tsunami waves • When waves reach shallow water, they "feel" the shallow bottom, just like ordinary waves, and they slow down (to 20-30 mph) • Because of the massive energy, this slowdown causes them to build up very high (up to 50-100 m)

  6. Tsunami can be generated by any process that displaces a large amount of water: • Sub-sea earthquakes • Giant landslides • Volcanic eruptions • Meteorite impacts

  7. Runup • Maximum height above sea level reached by a tsunami when it reaches shore

  8. Inundation • Horizontal distance from the normal water's edge reached by a tsunami

  9. Hilo after 1946 tsunami

  10. 1952 Tsunami wave passing under bridge at Haleiwa Kaiaka Bay

  11. 1946 tsunami -- Hilo harbor: 159 fatalities

  12. Beach in Laie, O`ahu before tsunami generated by 1957 quake in Aleutians

  13. 1983 Japan tsunami -- water recedes

  14. 1983 tsunami in Japan 104 people drowned 700 boats, 59 houses destroyed $800 Million property damage

  15. 2000

  16. S.E. O`ahu Field Trip • Saturday, October 30 & Nov. 6 • 8:30 am – 3 pm • Meet Here at 8:30 am • We will see Diamond Head, Hanauma Bay, Koko Crater, Castle Junction • Bring water, hat, sun screen, walking shoes • Worth 30 pt. Additional Credit

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