Story perspectives

Cajon Pass Gate Raises 50% M7 Quake Threat

6/17/2026

Summary

Researchers Warn Earthquake

Hawai‘i Institute of Geophysics and Planetology researchers say the San Andreas and San Jacinto faults have reached stress levels not seen in 1,000 years.
The study calls the wildfire-riddled Cajon Pass an “earthquake gate” that could block or permit a large rupture to cross between the faults.
California officials estimate a 50 percent or higher chance of a magnitude-7 earthquake in coming decades and urge hazard assessment and emergency preparation.

Summary

Researchers Model Junction

Researchers built a physics-based model of Southern California’s fault junction that can be adapted for rupture-risk assessment at other junctions worldwide.
The model’s scenario outputs give planners clearer guidance for infrastructure upgrades and emergency-response strategies.
Mapping stress accumulation over a millennium, the model provides a data-driven basis for funding retrofits of critical facilities such as hospitals and bridges.

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Researchers Warn Earthquake

Hawai‘i Institute of Geophysics and Planetology researchers say the San Andreas and San Jacinto faults have reached stress levels not seen in 1,000 years.
The study calls the wildfire-riddled Cajon Pass an “earthquake gate” that could block or permit a large rupture to cross between the faults.
California officials estimate a 50 percent or higher chance of a magnitude-7 earthquake in coming decades and urge hazard assessment and emergency preparation.

1 / 2