Tsunami - PowerPoint PPT Presentation

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Tsunami

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Tsunami Series of very long-wavelength waves on the ocean Tsunami = – PowerPoint PPT presentation

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Title: Tsunami


1
Tsunami
Series of very long-wavelength waves on the ocean
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Tsunami
  • "tidal wave"
  • Tsunami has nothing to do with tides

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Video clipTsunamis
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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)

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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)

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

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

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

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Hilo after 1946 tsunami
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1952 Tsunami wave passing under bridge at Haleiwa
Kaiaka Bay
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1946 tsunami -- Hilo harbor 159 fatalities
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Beach in Laie, Oahu before tsunami generated by
1957 quake in Aleutians
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1983 Japan tsunami -- water recedes
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1983 tsunami in Japan 104 people drowned 700
boats, 59 houses destroyed 800 Million
property damage
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2000
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S.E. Oahu Field Trip
  • Saturday, October 30 Nov. 6
  • 830 am 3 pm
  • Meet Here at 830 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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