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).
He played Detective Nick Amaro in Law & Order: Special Victims Unit. Starring as Detective Scotty Valens in Cold Case from 2003 to 2010 earned him additional fame. Though a Florida native, he went to school in New York. He was a guest on the The Sharon Osbourne Show with the feisty host Sharon Osbourne. His career was triggered by his acting role in The Shield.