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Napa's surprise fault line triggers earthquake study of the region
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, with one side of the home higher than the other. It marked the first time since the 1971 Sylmar earthquake that a temblor in California has caused surface rupture in a residential area. Now, the Napa...

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