Question

The difference in the _____ of P waves and S waves is used to locate an earthquake’s epicenter.

Answer 1

The correct answer will be arrival times. The difference in the arrival times of P waves and S waves is used to locate an earthquake’s epicenter.

Answer 2

The difference in the arrival of P waves and S waves is used to locate an earthquake's epicenter

Step-by-step explanation:

Nowadays we know the velocity of P and S waves when they travel among rocks of our earth interior and when there is an earthquake, P waves arrive first and a time later S waves arrive. Then, we have Time and Velocity, just what we need to find the epicenter Distance solving:

Time*Velocity=Distance

it's important to know that we need at least 3 seismographs located in different places on earth's surface to make triangulation to find earthquake's epicenter location.