1. Use Figure 2 to determine the difference in arrival times (in minutes) between the first P‐wave and first S‐wave for stations that are the following distances from an epicenter. 700 miles: minutes difference

450 miles: minutes difference

2500 miles: minutes difference

2. From the seismogram in Figure 1, the differences in arrival times between the first P‐wave and the first S‐waves equal (3, 7, 10) minutes. Circle your answer.

3. Refer to the travel‐time graph. What is the distance from the epicenter to the station that recorded the earthquake in Figure 1? miles

Surface waves First S wav First P wave 1 minute Figure 1. A typical seismogram (Earlier) 「 (Later) TIME Figure 1. A typical seismogram.

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