Glacier collapse near Nepal-Tibet border sends 1.2km ice avalanche into river, creating concrete-like flood

Analysis of satellite imagery revealed that almost two-thirds of a glacier near the Nepal-Tibet frontier detached and plunged roughly 1.2 km into the Lhende Khola valley. A Sentinel-2 image from Aug 24 showed the glacier intact, while a Landsat-9 capture on Aug 26 displayed a clear scar marking the breakage zone. Daniel Shugar of the University of Calgary calculated the ice slab to be about 200 square metres in area, falling from an elevation near 5,200 m. The vertical drop converted massive gravitational energy into motion, allowing the ice to fragment and sweep up loose material, turning the avalanche into a large debris flow that incorporated rocks, trees and sediment.

Earth Sciences New Zealand’s Simon Cox noted the resulting flow behaved unlike a normal river rise, and hydrologist Hatim Sharif likened it to “liquid concrete” capable of crushing vehicles and structures. The avalanche’s force was sufficient to register on seismic instruments, underscoring its magnitude.