July 18, 2026

California’s most famous fault isn’t shaking — it’s loading up. A new study finds the San Andreas and neighboring San Jacinto faults near Cajon Pass, just northeast of Los Angeles, are under more tectonic stress than at any point in the last 1,000 years, a dangerous quiet that echoes the buildup before past joint ruptures. The southern San Andreas has gone roughly 300 years without a major break, well past its usual 100-to-250-year cycle, and scientists warn a Fort Tejon-style quake could hammer much of Southern California with violent shaking and possible thousands of casualties. No one is saying when — only that the danger is real, persistent, and climbing.

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