Volcanic presence, Mt. Fuji. -- Mt. Fuji is the largest, best known, and perhaps most beautiful of Japan's volcanoes, and like many of the others it is potentially dangerous. Primary hazards include explosive eruptions, pyroclastic flows of ash and burning gas capable of traveling at speeds up to seventy miles an hour, and lava flows. In the long run, however, secondary effects of eruptions may be even more devastating. Among these are crop and structural damage from the fall of volcanic ash, mudflows and landslides in thick piles of unstable ash, flooding caused by the damming of rivers by volcanic debris and lava flows, and even climatic change resulting from suspension of ash and dust in the atmosphere.
A lacquer likeness of Mt. Fuji at a Fuji shrine