Because Japan apparently didn't have enough to worry about in the natural-disaster department: Seismologists have discovered a faultline underneath iconic Mt. Fuji near Tokyo, and one bad shift could send parts of the mountain tumbling toward the sea, reports AFP. Tests from a three-year study suggest the fault could trigger an earthquake with a magnitude of 7. The fault apparently has shifted at least once within the last million years.
"It's possible that (parts of) the mountain could collapse with mudslides flowing to Gotemba," says one of the scientists, referring to a Japanese city between the mountain and the Pacific Ocean.