Catastrophic ocean wave, usually caused by a submarine earthquake. Underwater or coastal landslides or volcanic eruptions also may cause tsunamis. The term tsunami is Japanese for “harbour wave.” The term tidal wave is a misnomer, because the wave has no connection with the tides. Perhaps the most destructive tsunami ever occurred in 2004 in the Indian Ocean, after an earthquake struck the seafloor off the Indonesian island of Sumatra. More than 200,000 people were killed in Indonesia, Thailand, India, Sri Lanka and other countries as far away as Somalia on the Horn of Africa.

Variants of TSUNAMI

tsunami or seismic sea wave or tidal wave

This entry comes from Encyclopædia Britannica Concise.
For the full entry on tsunami, visit Britannica.com.

Seen & Heard

What made you look up tsunami? Please tell us what you were reading, watching or discussing that led you here.