Discussion
The fastest seismic wave is the
Answer: A
Correct answer: P wave
The P wave is a compressional wave and travels faster than any other seismic phase, at about 6 km/s in the crust against roughly 3.5 km/s for the S wave. It is therefore the first to arrive at a station, which is what the P stands for - primary. Surface waves are slower still, which is why the order of arrival is always P, then S, then the surface waves.
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