The new account from the U.S. Geological Survey (USGS) differs from the explanation offered by the Geotechnical Extreme Events Reconnaissance (GEER) Association, which on Tuesday unveiled the first published analysis of the 22 March slide. The accident killed 43 in the little town of Oso at the edge of Washington’s Cascade Mountains
The difference revolves around a critical question:
What caused a hillside with a history of relatively minor landslides to suddenly turn into a tsunami of mud and debris that sped about a kilometer across a valley?
The findings could influence what signs scientists look for when trying to detect other potentially explosive slides"
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