Quake Swarm Rattles Southern California

Scientists are calling the earthquakes that struck near Yorba Linda Tuesday night and Wednesday morning are being called a “quake swarm,” or a “double quake” because there were two temblors — a 4.4 and 4.5 — that were similar in size. Patrick Healy reports from Caltech in Pasadena for the NBC4 News at 5 p.m. on August 8, 2012.