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).
Howey also portrayed the title role in the 2009 film, Stan Helsing. That same year, Howey also appeared in the web series CTRL playing Ben Piller. He has also appeared on the show Psych. In summer 2010, Howey joined the cast of the Showtime dramedy Shameless, as Kevin Ball, a series regular.