Thursday, January 17, 2008

Rockfall - Yosemite National Park Example

Upper Yosemite Rockfall

This was how Upper Yosemite looked like during winter.

In July 10th, 1996, a spectacular rock fall took place when a huge slab of granite about 150m wide, about 10m long, and 6m in thickness plunged near 500m off the valley wall to the valley floor below.
The rock mass, which weighted some 162kilotons, accelerated to about 160mph, before crashing onto the valley floor, where it generated an air blast, leveling 2000 trees, and killing 1 person who was crushed by a tree blown down by the air blast in front of the fallen rock mass.


Here are some pictures of some falls trails.


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