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  • Shaken But Not Stirred: Rock Formations Reveal Past Quakes' Size Limit (So.Calif)

    03/19/2006 8:11:22 PM PST · by blam · 3 replies · 560+ views
    Science News ^ | 3-18-2006 | Sid Perkins
    Shaken but Not Stirred: Rock formations reveal past quakes' size limit Sid Perkins Dozens of precariously balanced rocks in southern California tell a story just by standing there: Earthquakes that have occurred on nearby faults in recent millennia haven't exceeded magnitude 7. Researchers developing seismic-hazard maps for that and other areas are pondering how such rocky evidence might best be incorporated into their next round of updates. STILL STANDING. Analyses of this 1.3-meter-tall stone southeast of Riverside, Calif., and other precariously balanced rocks suggest that recent earthquakes on nearby faults haven't exceeded magnitude 7. J. Brune, et al. The Elsinore...