tsunami

When the earthquake, tsunami and nuclear crisis hit Japan in 2011, U.S. troops delivered aid in Operation Tomodachi, Japanese for "friends." Another Tomodachi program brings Japanese kids to the U.S.

Deadlines to rehouse evacuees have come and gone. It's still not clear when they might go home, and if so, what would they return to?

Tension is building along a major fault in the seabed off Alaska's coast, research shows. Devastating tsunamis from sudden slips in certain sections could directly hit Hawaii and Central California.