The time interval between the first arrival of a P-wave and the first arrival of an S-wave increases with distance from the focus of an earthquake.

Question

Quizplus · Accepted Answer

This is known as the time lag or time gap between the P and S waves, and it is used to determine the distance to the earthquake's epicenter. The farther away the recording station is from the epicenter, the longer the time lag between P and S waves.

The Time Interval Between the First Arrival of a P-Wave