Authors: Sergey V. Ershkov
Here is presented an estimating range of heights of tsunami which is assumed to attack the coast after earthquake or something else. The height of tsunami is proved to be not less than 20 meters. For the reason above, required height of seawall for protection from Tsunami should be not less than 25 meters. If tsunami overcome some suddenly rising the line of coast's profile, such a giant wave is proved to decrease a velocity, as well as suddenly increase height. It so called gradient catastrophe in regard to the proper components of tsunami velocity (shock wave).
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