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California Fault Stress and Cajon Pass Earthquake Risk

A new 1,000-year simulation finds Southern California's San Andreas and San Jacinto faults under near-record stress, raising concern about a potential rupture crossing both systems at the Cajon Pass junction.

Importance: 55%Confidence: 80%Mentions: 1Updated: October 18, 2026Page history (1 revision) →

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Researchers say stress on Southern California's San Andreas and San Jacinto faults has reportedly reached some of the highest levels seen in a 1,000-year simulation (ScienceDaily, October 2). Because both faults are highly stressed simultaneously, the Cajon Pass junction may be increasingly primed for a rupture that could cross both systems, though the study does not predict timing of any earthquake (ScienceDaily, October 2).