Yosemite Countrywide Park Using Tech To Intently Screen Rock Movement « Cbs13

The National Park Service has a map showing documented rockfalls in Yosemite Valley from 1857 to 2011.
This week, Yosemite Valley saw seven rockfalls on Wednesday and another Thursday afternoon — both on the Southeast face of El Capitan.
SACRAMENTO, Calif. (CBS13) – Yosemite National Park is now using high-resolution photography, laser-mapping of cliffs, and computer modeling to try to identify potential rock slides.
“It certainly helps to appreciate how far they go into the valley,” Oskin said.
Oskin says rockfall happens when large debris becomes detached from the face of a rock.

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