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Procedure: ompass 1. Study the data showing the difference in the arrival time of P-wave and S-wave on three seismic recording stations . Time difference in the Recording station arrival time of P-wave and S-wave (seconds) 44.8 Distance of epicenter from the station (km ) Batangas Puerto Princesa. Davao 32 38.4 2. Compute the distance of the epicenter from each of the stations using this formula: d= Td x 100 km 8 seconds Where: d= distance (km) Td = time difference in the arrival time of P-wave and S-wave (seconds) This formula is suited because 8 seconds is the interval between the times of arrival of the P-wave and S-wave at a distance of 100 km. 8 ​