The travel velocity of these two wave types is not the same (P-waves are faster than S-waves). Thus, if there is an earthquake somewhere, the first waves that arrive are P-waves. In essence, the gap in P-wave and S-wave arrival gives a first estimate of the distance to the earthquake.
With the mysterious U.S. Senator Eddie Morra (Bradley Cooper) providing him with a second drug to counteract NZT's deadly side effects, Brian uses his enhanced abilities to help FBI agent Rebecca Harris (Jennifer Carpenter).
Season 2, Episode 8, .45 Calibre: George Nader (shown on the left, starred in Robot Monster and played Dr. Glenn Barton on The Man and the Challenge and Joe Shannon on Shannon) plays new Laramie sheriff Wells Clark.