What
is tsunami?
•A system of ocean gravity waves formed as a result of
large-scale displacement of sea surface. Can travel long distances without losing
energy.
•Length and Time Period
§Long wave length (of several 100 km)
§Periods of a few minutes
to about an hour
•Speed proportional to
square root of water depth
§500
to 1000 km per hour in Deep Ocean
§About
30 km per hour near shore
•Height of Tsunami Wave
§Less than a metre in the
Deep Ocean
§Grows to Tens of metres
near shore
