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M=5.2 southern California quake triggered a profusion of aftershocks on ‘bookshelf faults’ that link the active strands of the San Jacinto fault zone

Today’s quake struck along the central San Jacinto fault, a major element of the southern San Andreas system with its own history of large and frequent quakes, and so at high risk of future events. But the aftershocks do not line up along the right-lateral Clark or Coyote Creek sections of the San Jacinto, and instead have a scattershot character extending 5-10 km (3-6 mi) north of the M=5.2 epicenter.

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