The M5.2 earthquake that struck San Diego County on April 14 caused no injuries or major damage, but it drew renewed attention to the Elsinore Fault’s potential to generate much larger earthquakes. While historically quiet, the fault forms part of a complex system capable of producing cascading ruptures that could impact millions.
The Elsinore Fault Zone is a right-lateral strike-slip fault extending about 180 km (112 miles) through Southern California, running parallel to the San Andreas Fault and forming part of the broader San Andreas fault system. It cuts through the Peninsular Ranges and passes near several major population centers, making it a significant seismic hazard.
Despite appearing inactive, the fault holds the potential to generate a powerful M7.8 earthquake, according to Caltech seismologist Lucy Jones…