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amplitude analysis angle Appalachian mountains Appalachian Plateau apparent surface velocity arrival time interval assumed azimuth of approach Bath County Blue Ridge mountains Bollinger central Virginia network central Virginia refraction central Virginia region computed confidence interval crust crustal model crustal P wave crustal velocity structure DISTANCE km distance range earthquake data error estimated epicentral distance explosions Figure Fiqure Fluvanna County Giles County Goochland County hypocenters indicates km/sec least squares locations Mohorovicic discontinuity observations phase velocities Piedmont province ratio ray paths recorded refraction study S-P arrival secondary arrivals seismic seismic refraction seismograms seismometers South Carolina southwestern Virginia standard deviation Steinhart and Meyer surface velocity determinations travel time plot travel-time residuals Travel-time vs distance tripartite method tripartite network upper crustal velocity upper mantle velocity V&R PL Valley and Ridge Virginia refraction profile wave apparent surface wave arrival wave data wave velocity western shotpoint