A detailed study of sedimentary rocks exposed along a portion of southern California’s San Jacinto fault zone shows the fault to be no older than 1.1 million to 1.3 million years and that its long-term slip rate is probably faster than previously thought. Researchers at three universities conducted a study of the earthquake-active region, funded by the National Science Foundation, concluding that sedimentation related to slip in the San Jacinto fault zone began about 1 million years ago, significantly later than predicted by previous models.
Slip Rate Of Southern California Fault May Be Faster Than Previously Believed