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Estimation of Range to Seismic Event Origin Using S-P Times <br />By measuring the difTercncc in the arrival time..• of the taster I' wave and the slower S <br />wave. one can estimate the distance the waves traveled hcti~re reaching the scismimteter. <br />To cumrrt an ohscrvai 5-P time to a distance or range from the ping Mine station. the <br />seismic vd~xity stnrcture in the region must be known. Distance = f5-P nmeNtacax <br />where the taclor is :r function of the P-wave and S-wave velocities along the wave path. <br />