A map from the U.S. Tsunami Warning System shows the offshore location of a powerful earthquake that struck overnight, along with the revised tsunami advisory area.
U.S. Tsunami Warning System
In a photo from March 2011, then-U.S. Ambassador to Japan John Roos visits the Tohoku region, hardest hit by the tsunami and earthquake. He and his team then started the Tomodachi (Friends) Initiative to help young survivors.
Ben Chang/Courtesy of John Roos
Part of the main street in Hilo, Hawaii, was flattened by a tsunami in April 1946. That big wave was triggered by a quake near the Aleutian Islands, where the edges of two tectonic plates continue to collide.
Locals working for a UNDP cash-for-work program clear debris in one of the neighborhoods worst affected by the typhoon that hit Tacloban, Philippines, last November. Tim Walsh runs the program, which he hopes will help keep the local economy going.
A man rides a motorcycle near houses that were rebuilt in an area in Banda Aceh, the capital of Indonesia's Aceh province, that was devastated by the tsunami that hit on Dec. 26, 2004.