And just like that, the 28 Sept. 2004 M6 Parkfield earthquake--anticipated for so long--is old enough to vote. We know that moderate Parkfield quakes aren't quite as regular as they once appeared, but still, 18 yrs could be well into the 'renewal window.'
The Parkfield Experiment is a comprehensive, long-term earthquake research project on the San Andreas fault. Led by the USGS and the State of California, the experiment's purpose is to better understand the physics of earthquakes - what actually happens on the fault and in the surrounding region before, during and after an earthquake. Ultimately, scientists hope to better understand the earthquake process and, if possible, to provide a scientific basis for earthquake prediction.
These pages describe the scientific background for the experiment, including the tectonic setting at Parkfield, the historical earthquake activity on this section of the San Andreas fault, the monitoring and data collecting activities currently being carried out, and plans for future research. Data are available to view in real-time and download.
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