from>>> http://www.livescience.co...ke-fault-california.html

New Hidden Quake Fault Found in California


The newly discovered, active, 22-mile-long strike-slip fault is named Polaris for the old mining town it runs through (by contrast, the San Andreas Fault is more than 800 miles long).

The Polaris Fault was discovered using laser imaging technology known as LiDAR, which was used as part of the U.S. Army Corps of Engineers’ evaluation of the dam. LiDAR emits laser pulses down toward the ground from an airplane — even through dense vegetation — to get high-resolution topology maps. Once researchers stripped off the heavy pine tree layer from the maps, they found evidence of the fault sitting just 200 meters from the dam.

"We weren't expecting it at all," said Lewis Hunter, a senior geologist for the U.S. Army Corps of Engineers Sacramento District.

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