Study: California’s big July quakes strain major fault

This Sept. 13, 2011 photo shows Anthony Guarino Jr., a seismic analyst at the California Institute of Technology, demonstrating an early earthquake warning system in Pasadena, Calif. The nation's first statewide quake warning system will debut Thursday, coinciding with the 30th anniversary of the Loma Prieta earthquake that ravaged the San Francisco Bay area on Oct. 17, 1989, as well as the annual Great Shakeout safety drill. (AP Photo/Reed Saxon, File)

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