https://www.youtube.com/watch?v=GZYjzN5m470
On 3 July 2021, a catastrophic debris flow tore through Izusan in Atami, Japan, after extreme rainfall saturated hillside soils.
Mudslides mix water, soil, and debris into a dense, fast-moving slurry that can destroy buildings along steep drainage paths — a classic mass-wasting hazard after intense rain.