Napa's surprise fault line triggers earthquake study of the region

When a magnitude-6.0 earthquake hit California's wine country this summer, scientists rushed to California Highway Patrol helicopters to survey the scene. The results were surprising. The earthquake tore up to the surface, producing a 9-mile-long scar that sliced through vineyards, asphalt and even homes. A buried earthquake fault had awoken along a trail never before documented or mapped by scientists, stunning homeowners who found houses spun off their foundations and broken...

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