Question

Which of these statements best explains why P waves arrive earlier than S waves at the seismic station?

A. S waves are generated after P waves arrive at the surface
B. S waves make longer lines on the seismogram than P waves
C. P waves are created first and S waves originate from P waves when they are reflected by solid rocks
D. P waves move straight through all medium and S waves move only through solids in a curvy motion

Answer 1

I believe the answer is A. S waves are generated after P waves arrive at the surface

Answer 2

D. P waves move straight through all medium and S waves move only through solids in a curvy motion

Step-by-step explanation:

The first kind of wave that is mentioned here is the P wave. This is also called the primary wave. This type of wave can move through solid rock and fluids. Because of this, this is the wave that arrives first at a seismic station. These are compressional waves. On the other hand, S waves are the second type of wave that you feel in an earthquake. These are slower and do not move through liquid mediums.