Earthquake 1 First P Arrival First S Difference in P Distance to P-wave Time of Travel Earthquake and S Wave Arrival Times Arrival Epicenter Time Houston 12:30:15 12:34:15 2800 5 Min 20 Sec 12:24:55 4 Minutes Denver 12:30:20 12:32:50 Seattle 12:31:00 12:33:10 time of earthquake = arrival time of the first P-wave minus the P-wave travel time %3D

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