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7 October 2014

Detecting avalanches from sounds we can’t hear

Researchers have developed a new avalanche monitoring method that uses sound below the range of human hearing to detect and track these deadly and destructive snow slides. The technique can detect an avalanche from the moment it starts, picking up the unheard thump of a rupture in the snowpack that can precede the snow cascade. It can then track the avalanche’s path second by second down the mountain.

In a new study published last month in Geophysical Research Letters, a journal of the American Geophysical Union, scientists report using an array of infrasound detectors on a mountainside to pick up low-frequency sound waves emitted from one of a series of January, 2012, avalanches in Idaho’s Canyon Creek corridor.


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