Tsunami is a word that means "harbor wave" in Japanese and are caused by undersea earthquakes, landslides, or volcano eruptions. Tsunami is pronounced (soo-na-me). Most tsunamis are caused in the Ring of Fire, the Ring of Fire is many volcanoes around the Pacific Ocean.
Tsunamis can be widths of 60 to 120 moiles, they can be as tall as 500 feet, and can reach speeds of about 450 to 500 miles per hour. Theese giant waves are known to obliterate coasts.
Hurricanes and cyclones also cause tsunamis, called storm surges. Storm surges are extremely powerful at high tide.
Signs of a tsunami are strange sights, sounds, or hissing noises.