Cause, scope determined for deadly winter debris flow in Uttarakhand, India
https://www.sciencedaily.com/releases/2021/06/210610150125.htm
The event began when a wedge of rock carrying a glacier broke off of a steep ridge in the Himalayan mountain range. The resulting debris flow destroyed two hydropower facilities and left more than 200 people dead or missing.
A self-organized coalition of 53 scientists came together in the days following the disaster to investigate the cause, scope and impacts. The team determined that the flood was caused by falling rock and glacier ice that melted on its descent -- not by a lake or diverted river -- which will help researchers and policymakers better identify emerging hazards in the region.