On this time-travel curve,if a large earthquake is 400 km away from the station,what can you say about the arrivals of the P- and S-waves?

Question

Quizplus · Accepted Answer

According to the time-travel curve, the P-waves arrive at the station earlier than the S-waves. The difference in arrival time between the P- and S-waves is proportional to the distance of the earthquake from the station. At a distance of 400 km, the difference in arrival time between the P- and S-waves is approximately 40 seconds. Therefore, the correct answer is A) the P-waves will arrive 40 seconds before the S-waves.

On This Time-Travel Curve,if a Large Earthquake Is 400 Km