The level of seismicity in Colorado has been characterized as being low to moderate (Kirkham and Rogers, 1981) due in part to the lack of adequate seismographic coverage in the state. The largest known historical earthquake in Colorado was the 8 November 1882 earthquake, whose size (estimated Richter magnitude ML 6.2-6.6) and location (somewhere in north-central Colorado) remain controversial (McGuire et al., 1982; Spence et al., 1996). The best documented earthquakes in Colorado have been those induced by the disposal of waste fluids at the Rocky Mountain Arsenal near Denver (Evans, 1966; Healy...

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