The Time Difference Between the First Arrival of P Waves

The time difference between the first arrival of P waves and the first arrival of S waves at a particular seismograph recorder

A) Is used along with the maximum amplitude of S waves to determine earthquake magnitude.
B) Is used along with the maximum amplitude of P waves to determine maximum earthquake intensity.
C) Is used to determine how far away the seismograph recorder is from the focus of the earthquake.
D) Both a and c are correct.

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