Researchers say stress along the San Andreas and San Jacinto fault systems has reached critical levels, raising concern over a future major earthquake that could threaten Los Angeles, the Inland Empire and key infrastructure.
By yourNEWS Media Newsroom
Southern California may be facing its highest long-term risk of a major earthquake in a millennium, according to new research examining 1,000 years of seismic activity along the San Andreas and San Jacinto fault systems.
Researchers at the University of Bern in Switzerland, working with the University of Hawaiʻi at Mānoa and other institutions, released a study showing that tectonic stress along the region’s major fault systems has reached, and in some places exceeded, the highest levels identified in the past 1,000 years.
The scientists said the findings suggest parts of Southern California are now in a “critically loaded” condition, increasing the long-term risk of one or more major earthquakes. The study also raised the possibility of a large multi-fault rupture involving both the San Andreas and San Jacinto systems.
The research focused on fault history across Southern California and reconstructed past seismic activity using geological evidence, radiocarbon dating, tree-ring data, historical records and a physics-based 4D model. The study examined how stress has accumulated over time and how fault segments may interact during major seismic events.
Journalist Clayton Morris discussed the study this week on his Redacted podcast, focusing on the Cajon Pass northeast of Los Angeles, where the San Andreas and San Jacinto faults converge. Morris described the area as an “earthquake gate” that could allow a joint rupture, which he characterized as the worst-case scenario for a major quake.
Such an event could place Los Angeles and the Inland Empire at significant risk, with highways, rail lines, power systems and nuclear facilities potentially vulnerable to major damage, according to the information provided.
Morris also questioned whether California officials are prepared for a disaster of that scale, citing criticism of the state’s response during the Palisades wildfires.
The study has drawn attention from commentators and online accounts focused on disaster preparedness. Mitch Mitchem, who runs the popular X account “@HustleBitch_,” also discussed the research and said scientists cannot predict the exact timing of a major earthquake, but can identify when pressure has built up over long periods.
“Scientists can’t tell you the day. They can’t tell you the month. They can’t tell you the year. But they can tell you something else. The pressure has been building for centuries. And pressure doesn’t disappear. It gets released. The only question is how much. And when,” Mitchem said in a post shared with the report.
“Because every day millions of people wake up, go to work, drive to school, board flights, and live their lives above fault lines that have produced some of the most destructive earthquakes in American history,” he added. “Now researchers are warning that the stress levels may be among the highest seen in a thousand years. That’s why people are asking the question nobody wants to answer: If the pressure has been building for centuries… what happens when it finally breaks?”
Warnings about “The Big One” in Southern California have circulated for decades, but the new study adds fresh concern because it places current stress levels in the context of a 1,000-year fault record.
The researchers did not provide a specific date, month or year for a future earthquake. Instead, the study points to a long-term increase in risk tied to accumulated tectonic stress across fault systems capable of producing powerful seismic events.
For Southern California, the findings renew attention on preparedness, infrastructure vulnerability and the possibility that a future earthquake could involve multiple fault segments rather than a single isolated rupture.
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