The __________is a direct measure of the distance from a seismic station to the focus of a distant earthquake.
A) time elapsed between the first P- wave arrivals from the first and last aftershocks
B) time interval between the first P and S- wave arrivals
C) magnitude of the ground acceleration of surface wave passing a station
D) how long before the earthquake your animals started acting agitated

Question

Quizplus · Accepted Answer

The time interval between the first P (primary) and S (secondary) wave arrivals is used to determine the distance from a seismic station to the earthquake's focus. P waves travel faster than S waves, and the difference in their arrival times can be used to calculate how far away the earthquake occurred.

The __________Is a Direct Measure of the Distance from a Seismic