The catastrophic floods in Nepal and Tibet that have killed at least 273 people were triggered by a massive glacier collapse and debris flow that registered as a magnitude 5.2 landslide, according to the U.S. Geological Service (USGS).

The USGS originally pinpointed the cause of the mudslides as a 4.4 magnitude earthquake but later updated its analysis after observing data from nearby seismic stations, long period seismic waves and satellite imagery. That data suggested that no earthquake had occurred.

Climate experts at the Kathmandu-based International Centre for Integrated Mountain Development told The Associated Press that Wednesday’s…

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