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Scientists piecing together satellite imagery and seismological data said on Thursday that a high-altitude landslide coinciding with a glacial collapse likely caused the deadly flash flooding in Nepal and Tibet.
Glaciologists and geologists had already determined that an enormous chunk of a glacier had snapped off on Wednesday morning. On Thursday, a group of scientists analyzing the events preceding the flooding said that newly available images, captured at a time with less cloud cover, show that an enormous chunk of the mountainous bedrock beneath that glacier had also given way.
“The rock that the glacier was sitting on collapsed,” said Kristen Cook, a geomorphologist at the Université Grenoble Alpes in France. The combined force of the collapse sent millions of metric tons of rock and ice into the valley below, she added.
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