GEOL 1700 Lecture Notes - Lecture 5: Longwave, Wind Wave, Subduction

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7 Feb 2017
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Tsunamis and Tsunami Hazards
January 30, 2017
Means Haror Wave in Japanese.
A tsunami is a wave train or series of waves generated in a body of water
by an Impulsive Disturbance that vertically displaces the water column or
by the transfer of momentum of the ocean water.
Sudden Faulting (EQ) produced vertical displacement on the ocean floor
Tsunamis are wave train or series of waves
Shallow water waves
Wave dynamic and Terms:
Long wave length
Long wave period 10-60 minutes
Low amplitude
Changes in velocity and wave length as a function of water depth
February 1, 2017:
Sometimes a few minutes before a coastal area is inundated by s
tsunami, there is a rapid withdraw of water along the shoreline
representing a wave trough.
Run-Up:
Inundation:
Classified as Local Tsunamis (less than 300 km away or less than 30
minutes away) or Distant Tsunamis (more than 1400 km away or over 2
hours’ arrival time)
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