No. The length of days is controlled by how long it takes the Earth to spin one time on its north-south axis.
The days may feel longer after a tsunami but no, the length of the day depends on the earths rotation not tsunamis.
tsunami
tsunami
No
A hurricane lasts longer. A tsunami can cross the entire Pacific Ocean in about a day. After all portions of a tsunami have hit land it will have largely dissipated. By contrast, a hurricane moves much slower over the ocean and can easily last for over a week.
the japans tsunami
If you are smart and work hard you may make something close to a tsunami gun, but if you're reading this in the future then yes. You could make a tsunami gun.
Tsunami waves have a much longer wavelength in proportion to their height than ordinary waves do. They are often miles long.
it will make a even bigger tsunami
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No, every wave is not a harbor wave or popularly called Tsunami. Tsunamis have heir wavelength much longer than normal sea waves.
The destruction of a tsunami could make a building fall down or flood the building. the percentage is 100.9% of damage.