Swarm of more than 100 earthquakes rattles Southern California's Imperial County

A swarm of more than one hundred earthquakes rattled Southern California's Imperial County on Saturday, with the largest reported temblor registering at a magnitude of 4.5, according to the United States Geological Survey. 

The earthquakes first started at around 4:15 p.m., about 2.5 miles northwest of Brawley, a city located south of the Salton Sea, approximately 30 miles from the U.S.-Mexico border in Calexico and nearly 130 miles east of San Diego. 

Dozens of similarly-sized quakes followed it until about 7:20 p.m., when the 4.5-magnitude temblor struck about a mile northwest of Brawley. Most of the earthquakes registered in the surrounding area were said to be under a 2.0 magnitude, while some of the larger instances registered as magnitude 4.0, magnitude 3.6 and magnitude 3.3. 

Brawley is located in the Brawley Fault Zone an offshoot of faults connected to the Imperial Fault Zone, which links to the San Andreas Fault. According to the Southern California Earthquake Data Center, the fault zone is "prone to earthquake swarms."