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).
While Bradley Cooper isnât the protagonist this time around, heâs one of the executive producers of the series and will be back here and there as a mentor to Finch, reprising his role as Edward Morra, whoâs now not only a successful writer but a U.S. senator for New York.