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More than 360 minor earthquakes were reported in and around the Imperial County city of Brawley between the Salton Sea and the Mexican Border.
Nearly 200,000 people in Southern California felt shaking after hundreds of earthquakes rattled the Imperial County desert over the weekend, with the strongest earthquake reported as a magnitude 4.7.
Earthquakes usually occur along fracture zones in Earth's crust, where large tectonic plates slide past one another and become locked. Stress builds up over long periods and is suddenly released in the form of an earthquake.
Unlike the San Andreas Fault — one of the most heavily studied faults in the world — scientists know comparatively little about the Rose Canyon Fault.