re: 5.9 quake in Parkfield, California
Map and list of current quakes
This is interesting from a 1/04 article at UC Berkeley.
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Among the earthquakes that occurred at an upswing in microquakes was the destructive 1989 Loma Prieta quake, a magnitude 7.1 temblor. Assuming the three-year cycle has continued, the next upswing in microquakes should occur in late 2004, Nadeau said.