NASA: 21-Trillion-Cubic-Foot Avalanche That Killed 9 People, 350 Sheep, and 110 Yaks in July Can Be Seen From Space

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acquired June 24, 2016
acquired June 24, 2016
acquired July 21, 2016.  image:  nasa
acquired July 21, 2016. image: nasa

This massive avalanche was confirmed as 21 trillion cubic feet of debris.  It killed 9 people, 350 sheep, and 100 yaks in Tibet in July 2016.

NASA has photos of the slide from space.

Avalanche in Tibet Confirmed as 21 Trillion Cubic Foot “Glacier Slide”

Rescuers search for survivors at the site of ice avalanche in southwest China’s Tibet Autonomous Region. The avalanche has been confirmed as a glacier slide. [Photo: Xinhua]
Rescuers search for survivors at the site of ice avalanche in southwest China’s Tibet Autonomous Region. The avalanche has been confirmed as a glacier slide. [Photo: Xinhua]

Massive and Mysterious Ice Fall in Tibet

by NASA

On July 17, 2016, a huge stream of ice and rock tumbled down a narrow valley in the Aru Range of Tibet. When the ice stopped moving, it had spread a 30-meter-thick pile of debris across 10 square kilometers. Nine people, 350 sheep, and 110 yaks in the remote village of Dungru were killed during the avalanche.

The massive debris field makes this one of the largest ice avalanches ever recorded. The only event of a comparable size was a 2002 avalanche from Kolka Glacier in in the Caucasus , explained Andreas Kääb, a glaciologist at the University of Oslo.

A multispectral imager on the European Space Agency’s Sentinel-2 satellite captured an image of the debris field on July 21, 2016. The Operational Land Imager, a similar instrument on Landsat 8, acquired an image on June 24, 2016, that shows the same area before the avalanche.

The cause of the avalanche is unclear. “This is new territory scientifically,” said Kääb. “It is unknown why an entire glacier tongue would shear off like this. We would not have thought this was even possible before Kolka happened.”

Kääb’s preliminary analysis of satellite imagery indicates that the glacier showed signs of change weeks before the avalanche happened. Normally, such signs would be clues the glacier might be in the process of surging, but surging glaciers typically flow at a fairly slow rate rather than collapsing violently in an avalanche.

After inspecting the satellite imagery, University of Arizona glaciologist Jeffrey Kargel agreed that a surging glacier could not be the cause. “The form is completely wrong,” he said. “It must be a high-energy mass flow. Maybe liquid water lubrication at the base played some role,” he said.

Tian Lide, a glaciologist at the Chinese Academy of Sciences, visited the site in August and described the avalanche as “baffling” because the area where the ice collapse began is rather flat. “We failed to reach the upper part of the glacier for safety reasons,” he said in an email, “but we will go the upper part [later] to see if we can find some more hints about what caused the glacier disaster.””


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