Question

To determine the location of an earthquake's epicenter, scientists measure the arrival times of _______ waves, which arrive first, and _______, which arrive second.
A.
S; P
B.
P; S
C.
surface; P
D.
S; surface

Answer 1

The correct answer is B. P; S. Scientists measure the arrival times of P-waves (primary waves), which arrive first, and S-waves (secondary waves), which arrive second, to determine the location of an earthquake's epicenter.