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A torrent of rock down a valley.
Also known as: Debris flow pictogram Japan, Mudflow symbol Japan
Marks an evacuation site as suitable for a debris flow, distinguished in the Japanese set from an ordinary landslide.
Marks a site designated as suitable for evacuation from a debris flow.
Contexts: Public information
Is separated from the landslide mark because the two behave differently: a slope failure drops material at the foot of the slope, and a debris flow travels down a stream channel for kilometres, so safe ground for one is not safe ground for the other.
Contexts: Public information
A square panel carrying a narrow valley between two slopes with a mass of angular fragments running down its channel.
One of the eight marks in the set.