13) If the P-wave arrival time is 2:08:15 and the S-wave arrival time is 2:13:05, the difference in arrival time is

and the epicenter

away.

the difference in arrival time is  4 mins 50 seconds and the epicenter  3300 km away.

Explanation:

A seismograph is used to determine the epicenter of an earthquake. To determine the epicenter you first need to know the arrival times of the P-wave and S-wave, then you calculate the difference between their arrival times. Lastly you use the earthquake travel time graph to determine where the difference in y value equals to the arrival time difference, the x value at this point is the epicenter.

Given that the P-wave arrival time is 2:08:15 and the S-wave arrival time is  2:13:05.

The arrival time difference = 2:13:05 - 2:08:15 = 4 minutes 50 seconds.

From the earthquake travel time graph attached below, the two curves have a difference of 4 minutes 50 seconds at x = 3.3

The epicenter is at 3.3 × 10³ km = 3300 km

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