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Shaking from Napa earthquake was highest ever recorded in area

from Los Angeles Times

The ground-shaking during the magnitude 6.0 Napa earthquake was the highest level recorded in modern times for downtown Napa, according to the U.S. Geological Survey. The ground motion recorded in downtown Napa came very close to the maximum level of ground shaking engineers use in their calculations when designing new buildings in that area, said Erol Kalkan, a USGS research structural engineer. more

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