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Swarms of small tremors deep beneath the ground after two recent quakes in Monterey County may be adding stress to a seismically locked segment of the San Andreas fault and could presage a major earthquake, two Berkeley scientists suggest.
The scientists detected an abrupt increase in tremor activity beneath the tiny San Luis Obispo County town of Cholame, just after two large quakes struck on the San Andreas fault in nearby Parkfield and San Simeon in Monterey County.