Why some earthquakes stop while others tear through entire states
In short: The San Andreas Fault is famous, but its behavior is unpredictable. This video explores the physics of 'earthquake gates'—specific junctions where a rupture might either stall or jump onto new fault systems depending on stress levels.
In 1857, a massive earthquake traveled roughly 220 miles before stopping at Cajon Pass. However, in 1812, a rupture reached that exact same junction and continued through it by jumping to another fault system. These two events demonstrate that the same geography can produce vastly different outcomes.
A 2026 study modeled 1,000 years of seismic history to identify the cause. Researchers suggest Cajon Pass acts as an 'earthquake gate.' When stress levels on the San Andreas and San Jacinto fault systems become sufficiently similar, a rupture is more likely to jump across the junction. Current models indicate these stress levels are unusually high.
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Sources
- Summary by Intellect · source: San Andreas: Where the Next Rupture Will End
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