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11 Cards in this Set
- Front
- Back
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How is a tsunami created?
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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.
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What is a seiche?
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A wave in an enclosed water body.
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What is the time between the passage of crests?
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Period
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What is the frequency?
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1/Period
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What is the wavespeed?
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Wavelength/Period
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What is the main difference between tsunami and wind-driven waves?
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The length is less than depth for wind-driven waves (they're deep-water waves). Tsunamis are shallow water waves.
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Wave base =
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1/2 base length
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Why does the tsunami steepen as it hits the shore?
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Because sea-floor depth decreases, the tsunami slows down, but the water behind it is going fast, so the water bunches up and steepens.
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Wind waves on shore...
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Rotate in circles
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Tsunami waves...
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water flows straight
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Subduction of ocean plates under shallow water cause
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Large uplift
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