Numerous felt earthquakes have occurred in southern California in 2001. The most prominent sequences have been near Big Bear, in the Coso region in eastern California, in the northern Los Angeles basin, and along the San Jacinto Fault (Figure 1). These main shocks have been followed by productive aftershock sequences and in some cases by enhanced microseismicity in adjacent regions, which were recorded by the Caltech-USGS TriNet (Hauksson et al., 2001). These sequences thus raise the possibility that background seismicity has increased regionally, as has happened in the past.

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The late 1980's and early 1990's...

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