Why does a tsunami wave get bigger?

As the tsunami waves become compressed near the coast, the wavelength is shortened and the wave energy is directed upward - thus increasing their heights considerably. Just as with ordinary surf, the energy of the tsunami waves must be contained in a smaller volume of water, so the waves grow in height.

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Keeping this in consideration, when was the last tsunami in the world?

Tsunami of (Bougainville, P.N.G.) Tsunami of (New Britain, P.N.G.) Is a 9.6 earthquake possible? No, earthquakes of magnitude 10 or larger cannot happen. The magnitude of an earthquake is related to the length of the fault on which it occurs.

Correspondingly, has there ever been a 9.9 earthquake?

The 1960 Valdivia earthquake and tsunami (Spanish: Terremoto de Valdivia) or the Great Chilean earthquake (Gran terremoto de Chile) on was the most powerful earthquake ever recorded. Various studies have placed it at 9.4?9.6 on the moment magnitude scale. Can you swim under a tsunami? Can you swim in that? No. Because of their long wavelength, tsunamis act as shallow water waves. One property of shallow water waves is that the horizontal fluid velocities under the wave are independent of depth.

Are there sharks in a tsunami?

That is impossible and can never happen. That is because sharks swim in very deep parts of the ocean so a tsunami can never catch a shark. Whereas, an alligator leaves only in rivers and lakes and tsunamis can't happen in such water bodies.