Absolute hypocentral location errors are traditionally estimated from the errors in the locations of quarry blasts. Catalog completeness has been evaluated by examining cumulative frequency-magnitude relationships (e.g.,Rydelek and Sacks, 1989). In the Pacific Northwest, however, the number of quarries with well defined blasting schedules is relatively sparse (e.g.,Benson et al., 1992). Seismic refraction detonations provide an independent assessment of actual location errors of surface events in the Pacific Northwest and elsewhere. Because the detonation yields are also known, their reported magnitudes can be used to investigate the detection and location thresholds for low-magnitude earthquakes....

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