Tsunamis are powerful ocean waves, predominantly caused by underwater earthquakes, volcanic eruptions, or landslides. These natural disasters travel across...
Tsunamis are most commonly triggered by large underwater earthquakes that displace vast amounts of ocean water. Volcanic eruptions, landslides, and even meteoroid impacts can also generate them.
In the deep ocean, tsunamis can travel at speeds up to 500 miles per hour (800 km/h), similar to a jet plane. Their speed significantly decreases as they enter shallower coastal waters.
Key natural signs include a strong earthquake felt near the coast, a sudden and dramatic receding of ocean water, or an unusual loud roar coming from the ocean. Official warnings are also broadcast.
A tsunami is typically a series of powerful ocean waves, known as a 'wave train.' The initial wave may not be the largest, and subsequent waves can arrive minutes to hours apart, causing prolonged danger.