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).
La Rocque returned the following year in International Crime. In this version, reporter Lamont Cranston is an amateur criminologist and detective who uses the name of The Shadow as a radio gimmick. Thomas Jackson portrayed Police Commissioner Weston, and Astrid Allwyn was cast as Phoebe Lane, Cranston's assistant.