When is Mt. Fuji likely to erupt?
The first recorded eruption of Mt. Fuji was in 781, and it is said to have erupted 13 times, roughly once even 30 years, till 1083.
An interval of 428 years elapsed before the 14th eruption, and only three eruptions were recorded between 1511 and 1707.
Since then, no volcanic activity has been observed, which indicates that Mt. Fuji is in a dormant state. However, there still is the possibility of an eruption, no matter how slim.
As is the case with earthquakes, it is difficult lo predict volcanic eruptions; but Japan's excellent observation system, equal to that of Hawaii, provides relatively early warning about volcanic activity.