posted by Anonymous .
why is the arrival time for the p-wave always earlier than the arrival of the s-wave the same seismograph station?
is it because the p wave always reaches before the s- wave.
Since this is not my area of expertise, I searched Google under the key words "p s wave seismograph" to get these possible sources:
In the future, you can find the information you desire more quickly, if you use appropriate key words to do your own search. Also see http://hanlib.sou.edu/searchtools/.
I hope this helps. Thanks for asking.