A "megaquake" hitting Japan in the next 30 years could trigger 100-foot tsunamis and kill hundreds of thousands of people.

One thing is certain. Japan is bound to continue experiencing devastating volcanic eruptions, like the last confirmed one of Mount Fuji, known as “Hoei Funka,” in 1707, and even bigger ones.

In 1707, all segments of the Nankai Trough ... That quake -- which also triggered the last eruption of Mount Fuji -- was followed by two powerful Nankai megathrusts in 1854, and then two in ...

In 1707, all segments of the Nankai Trough ruptured at once, unleashing an earthquake that remains the nation's second-most powerful on record. That quake -- which also triggered the last eruption of ...

In 1707, all segments of the Nankai Trough ... That quake - which also triggered the last eruption of Mount Fuji - was followed by two powerful Nankai megathrusts in 1854, and then two in 1944 ...