1)Displacement of a large area of sea floor
2) Ocean is displaces, waves radiate from the source in all directions
3) As Water shallows, waves slow down and increase in height to produce onshore waves upto 30m
4) Wave energy is crowded into a smaller volume of water
5) Waves which were 1m in deep water may reach 30m by the time they reach the shore
THe 4th or 5th wave is often largest - in a wave 40% of energy is scattered back to sea and 60% is expended at/near the ciast. Sea floor irregularities reflect some wave energy so that less energy reaches the coast. The sea-floor topography in the coastal zone is important in the nature of the tsunamis at the run-up stage.
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