Answers

2015-07-06T14:55:51+08:00
The number of seconds between the first P-wave and the first S-wave. This number will be used to tell how far your seismograph device is from the epicenter of the earthquake.
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2015-07-08T19:55:08+08:00

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To locate an epicenter, you need to determine the time interval between the arrival of P-waves and S-waves on the seismograms from 3 different stations.

--Mizu
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