Deep Slip Rates on the San Andreas Fault

Science  30 Jul 1999:
Vol. 285, Issue 5428, pp. 671-672
DOI: 10.1126/science.285.5428.671

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Parkfield, California, is located along the San Andreas fault and has been the site of a long-term earthquake prediction study since 1985. Microearthquake clustering provides detailed insights into the mechanisms of fault slippage and its connection to earthquakes. A study by Nadeau and McEvilly (page 718) illustrates the insights that can be gained from the Parkfield dataset. Slip rates at depth, rather than at the surface, can be deduced and can be correlated with earthquake occurrences. The results have implications for other fault areas that show both creep and major earthquakes.