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California 'Earthquake Gate' — San Andreas/San Jacinto Fault Stress Convergence
A new 1,000-year simulation study found that stress on Southern California's San Andreas and San Jacinto faults has reached historic highs simultaneously, suggesting the Cajon Pass junction may be primed for a rupture spanning both fault systems.
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## Overview
Researchers have identified an "earthquake gate" at the Cajon Pass junction in Southern California, where stress on both the San Andreas and San Jacinto faults has reached some of the highest levels observed in a 1,000-year simulation (ScienceDaily, October 2).
## Key Findings
Because both faults are highly stressed simultaneously, scientists say the Cajon Pass junction may be increasingly primed for a rupture that could cross both fault systems (ScienceDaily, October 2). The study does not predict when an earthquake will happen, only that stress conditions are unusually elevated (ScienceDaily, October 2).
## Why It Matters
The San Andreas and San Jacinto faults run through densely populated Southern California, including areas near Los Angeles and San Bernardino. A rupture that crosses both fault systems could produce a significantly larger and more damaging earthquake than a rupture confined to a single fault. This research adds to ongoing seismic risk assessments for the region and could influence building codes, insurance modeling, and emergency preparedness planning.
## What to Watch
Follow-up studies on the Cajon Pass junction, any official seismic hazard reassessments by USGS or California state agencies, and further simulation research refining rupture probability estimates.