The powerful earthquake off the coast of the Indonesian island of Sumatra on Dec. 26, 2004, triggered a tsunami that impacted a dozen countries, reaching as far as East Africa. NBC Universal, Inc.

On Dec. 26, 2004, a 9.1-magnitude earthquake beneath the Indian Ocean triggered a tsunami with waves up to 100 feet high, killing an estimated 230,000 people. Twenty years later, people gathered in ...

The most dangerous thing that can happen in the eerie vacuum between an earthquake and a tsunami is nothing. Once a tsunami warning is issued, the size of the wave and the number of minutes before it ...

Tsunamis are devastating natural disasters caused by underwater earthquakes, volcanic eruptions, or landslides that send massive waves crashing onto coastlines. The 2004 Indian Ocean tsunami remains ...

People gathered in prayer and visited mass graves in Indonesia’s Aceh province on Thursday to mark 20 years since the massive Indian Ocean tsunami hit the region in one of modern history’s worst ...