A 's a series of water waves (called a tsunami wave train) that's caused when a large volume of a body of water, such as an ocean,'s rapidly displaced. The Japanese term's literally translated into "harbor wave." Earthquakes, volcanic eruptions and other underwater explosions (detonations of nuclear devices at sea), landslides and other mass movements, bolide impacts, and other disturbances above or below water all have the potential to generate a tsunami. Due to the immense volumes of water a… (More on Tsunami)