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Which seismic wave causes tsunami?

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None of them. Tsunamis are formed by displacement of the water column either by vertical movement of the sea-floor or by collapse of material into the water. It is these events themselves that produce the seismic waves. read more

The seismic waves are energy waves, but they either pass through (P-waves) or reflect off the water interface (S-waves). The shaking induced by seismic waves may initiate a landslide that could form a tsunami, but tsunami are not caused directly by seismic waves. read more

After a sudden displacement of a large water volume by seismic activity (earthquake), the ocean floor is raised or dropped and large tsunami waves can be formed by gravitational forces. Waves travel outward from the quake zone in all directions in a ripple effect (propagation). read more

The epicenter of an earthquake sends out waves which are like an object dropped on to a still body of water that sends out ripples. After the stone hits the water ripples move outwards from the centre in every direction. An earthquake releases energy as shock waves, the so-called seismic waves, which ripple across the earth's surface. read more

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