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11 Cards in this Set

  • Front
  • Back
How is a tsunami created?
Created most often by subduction zone earthquakes. There is a vertical shift in the ocean floor that leads to an uplifted water mass which transmits throughout the ocean. Mostly in Pacific and Indian oceans.
What is a seiche?
A wave in an enclosed water body.
What is the time between the passage of crests?
What is the frequency?
What is the wavespeed?
What is the main difference between tsunami and wind-driven waves?
The length is less than depth for wind-driven waves (they're deep-water waves). Tsunamis are shallow water waves.
Wave base =
1/2 base length
Why does the tsunami steepen as it hits the shore?
Because sea-floor depth decreases, the tsunami slows down, but the water behind it is going fast, so the water bunches up and steepens.
Wind waves on shore...
Rotate in circles
Tsunami waves...
water flows straight
Subduction of ocean plates under shallow water cause
Large uplift