GEOLOGY

Detailed explanation-1: -As a tsunami enters shallow water near land, it slows down, wavelengths decrease, waves grow in height, and currents intensify.

Detailed explanation-2: -Tsunami wave height increase as they reach the shore due to the shallowing of seafloor.

Detailed explanation-3: -A tsunami only becomes hazardous when it approaches land. As a tsunami enters shallow water near coastal shorelines, it slows to 20 to 30 mph. The wavelength decreases, the height increases, and currents intensify. Tsunami warnings come in different forms.

Detailed explanation-4: -As waves move into shallower water, they contact the bottom and begin to move slower (see the Wave Energy and Wave Changes with Depth topic in the Waves unit). As waves slow down, they get closer together; their wave period shortens. This process is called shoaling, and it causes the height of waves to increase (Fig.

Detailed explanation-5: -As the waves approach the coast, their wavelength decreases and wave height increases. On the open ocean, the wavelength of a tsunami may be as much as two hundred kilometers, many times greater than the ocean depth, which is on the order of a few kilometers.