Set 9 Problem 3 Pressure waves and shear waves (known as P and S waves) initiated by earthquake travel at different speeds and the location of the earthquake epicenter (point of origin) can be calculated from this speed difference. Suppose a seismograph detects the arrival of P and S Waves At seconds apart, and assume typical propagation speeds of Vp km/s and vs km/s for P and S waves, respectively. Find an expression involving At, vP and vs that gives the distance in meters from the seismograph at which the earthquake occurred. Each wave travels at constant speed, unaffected by the presence of the other wave. Note the change from km to m units--your expression may need to include a conversion factor. Evaluate the distance numerically if At = 89 seconds, VP = 8.89 km/s, and v3 = 5.57 km/s. w Reset All