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Tsunami - the propagation of the killer wave

by S.S.L.Hettiarachchi and S.P Samarawickrama
Professor and Senior Lecturer, Coastal and Harbour Engineering Research Group, Dept of Civil Engineering, University of Moratuwa

On 26th December 2004, a bright sunny morning free of winds and showers, the Sri Lankan coastline witnessed the devastating impact of a tsunami, hitherto unknown phenomenon to many Sri Lankans. A tsunami is one of the many coastal hazards which Mother Nature can unleash. The name tsunami is after a Japanese word for storm/harbour waves. These are also referred to as tidal waves although they are not related directly to the tides.
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