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But the Elsinore fault is part of a larger seismic zone that experts fear and believe more people should know about.

The Elsinore fault zone is actually one of the largest in Southern California, according to Caltech, but “in historical times, has been one of the quietest.”

“The Elsinore fault is one of the major risks in Southern California,” Jones said.

The Elsinore fault zone runs from the Sonoran Desert in Imperial County through the western edge of Riverside County communities like Temecula, Murrieta and Lake Elsinore.

A particularly frightening, and plausible, prospect would be an earthquake that races up the Elsinore fault northwest onto the Whittier fault.