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Shallow earthquake hits Bay Area

OAKLAND, Calif. A magnitude-4.0 earthquake that struck the East Bay Monday morning was a very shallow but routine geologic shrug in an area notorious for seismic risk and yet another reminder of the threat lurking from a fault that's the Bay Area's most overdue for a major quake. A locked-up patch of rocks a mere 3 miles under Piedmont suddenly broke loose along the Hayward Fault, triggering a quake felt from Santa Rosa to Santa Cruz. "Because it was shallower than normal, people in the vicinity felt more intensified shaking than usual for an earthquake of this magnitude," said Keith Knudsen, deputy director of the Earthquake Science Center at the U.S. Geological...