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What Triggered Nepal Floods? New Ice-Rock Avalanche Theory Challenges GLOF Claims

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A disaster expert says it wasn't a glacial lake burst but a falling wall of ice and rock that triggered Nepal's devastating flash floods — and the difference matters for future warnings.

Competing Causal HypothesesGlacial Lake Outburst Flood (GLOF) TheoryMass Movement DynamicsClimate-Driven Cryosphere Change

Theory Briefing

  • Nepal Centre for Disaster Management President Bishal Nath Upreti argues an ice-rock avalanche, not a glacial lake outburst, caused the Nepal-Tibet flash floods.
  • The distinction between the two triggers has direct consequences for how early-warning systems are designed and where they focus.
  • Glacial lake outburst floods (GLOFs) have long been the dominant framework for Himalayan flood risk, making this challenge scientifically significant.
  • High-altitude ice and rock instability is increasingly linked to rising temperatures, adding a climate dimension to the competing theories.