Tsunamis are shallow-water waves because their wavelengths are so long that they will never be in water deeper than 1/2 its wavelength.

Name: Tsunamis are shallow-water waves because their wavelengths are so long that they will never be in water deeper than 1/2 its wavelength.
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Tsunamis can have wavelengths of 100 kilometers. The deepest ocean trenches only reach 11 kilometers in depth. Information can be found in the section Contemporary Oceanography Makes Use of Modern Technology.

Tsunamis Are Shallow-Water Waves Because Their Wavelengths Are So Long