Tsunami

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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