Ōsawa Failure, Erosional valley at Mount Fuji western slope, Japan
The erosional formation extends 2,200 meters in length, 500 meters in width, and reaches depths of 150 meters on Mount Fuji's surface.
The valley formation process began approximately one thousand years ago through alternating layers of lava flows and scoria on Mount Fuji's western face.
The Mount Fuji Sabo Office, established in 1969, represents Japan's commitment to managing natural disasters through engineering and environmental protection methods.
The valley generates debris flows containing 143,000 cubic meters of sediment that travel at speeds reaching 10 meters per second during rainfall periods.
Engineers constructed groundsel dams using eight-ton concrete blocks to contain sediment from debris flows and protect surrounding communities from natural hazards.
Location: Fujinomiya
Location: Narusawa
GPS coordinates: 35.36147,138.70667
Latest update: May 27, 2025 11:35
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