20_tsunami - Tsunami GS222 Lecture20 Overviewthislecture...

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Tsunami GS222 Lecture 20 
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Overview - this lecture Tsunami characteristics (L, C, H/L) Tsunami shallow water behavior Causes of tsunamis – Indian Ocean example
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Basics Tsunami  – series of waves with very long wavelengths  (100-200 km) and periods (10-80 minutes) period is much longer than storm-generated swell causes of tsunamis include: 1) earthquakes 2) landslides 3) meteorite impact decreasing probability
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Wave type and period Generating forces: 1) wind 2) storms 3) earthquakes 4) moon & sun
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Tsunami wave speed If tsunami wavelength is 100 km, is this a shallow or  deep water wave? (assume 4 km water depth) What is its wave speed in the deep ocean?
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Can you outrun a Tsunami? No.  Not even if you’re Usain Bolt. 100 m / 9.6 s = 10.4 m/s ~ 23 mph
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Littoral Zone If you’re lucky, trough will arrive first causing sea to  recede.  If crest arrives first, you’re in trouble.
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Tsunami L vs. H
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This note was uploaded on 01/20/2012 for the course GEO 222 taught by Professor Davidlund during the Winter '11 term at University of Michigan.

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20_tsunami - Tsunami GS222 Lecture20 Overviewthislecture...

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