Knowledge of the seismic hazard in Colorado is limited due to the short historical record of seismicity, the lack of permanent seismographic coverage, and the existence of human-induced earthquakes (Matthews 2003). The rate of seismicity in Colorado is characterized as low to moderate (Kirkham and Rogers 1981), yet the state has a history of occasional large-magnitude events (M > 5.5) (Talley and Cloud 1962; Kirkham and Rogers 2000), including an earthquake with estimated moment magnitude of 6.6 in north-central Colorado in 1882 (McGuire et al. 1982; Spence et al. 1996)....

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