The majority of tsunamis occur in the Pacific Ocean in an area commonly known as the "Ring of Fire." The Ring of Fire has a high level of seismic activity that often triggers volcanoes, earthquakes and tsunamis.
A tsunami is a series of powerful waves that sends surges of water as high as 100 feet onto land. Approximately 75 percent of tsunamis are caused by earthquakes under the ocean that create major changes to the ocean floor. Sometimes tsunamis are caused by landslides, volcanoes and possibly even asteroids. Tsunamis race so quickly across the sea that they can cross the entire Pacific Ocean in one day.