Two SoCal faults haven’t experienced a major earthquake near LA in over a century
Southern California’s San Andreas and San Jacinto faults remain under unprecedented stress, with no major quake in over 100 years. A new study highlights Cajon Pass as a critical junction that could determine whether future quakes stay localized or escalate. The region’s 300+ faults pose the highest urban earthquake risk in the U.S. Scientists warn of unpredictable rupture potential near Los Angeles.
What changed
New research identifies Cajon Pass as a key factor in whether future earthquakes grow beyond single-fault ruptures.
Live updates
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LA’s quake risk hinges on Cajon Pass junction as stress hits 1,000-year high
confidence 98%Southern California’s San Andreas and San Jacinto faults remain under unprecedented stress, with no major quake in over 100 years. A new study highlights Cajon Pass as a critical junction that could determine whether future quakes stay localized or escalate. The region’s 300+ faults pose the highest urban earthquake risk in the U.S. Scientists warn of unpredictable rupture potential near Los Angeles.
What's confirmed:
- Southern California’s San Andreas and San Jacinto faults have not produced a major earthquake near Los Angeles in over 100 years.
- The region’s faults are under the highest stress levels recorded in 1,000 years, raising concerns about a potential major quake.
- Southern California has over 300 faults capable of producing magnitude 6 or larger earthquakes, posing the greatest urban risk in the U.S.
- Half of the expected financial losses from earthquakes nationwide are projected to occur in Southern California.
Still unconfirmed:
- A study suggests Cajon Pass could act as an 'earthquake gate,' influencing whether future quakes remain confined to one fault or expand into larger events.
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SoCal faults at 1,000-year stress peak; 'Big One' risk rises
confidence 93%Southern California’s San Andreas and San Jacinto faults are under the highest stress levels recorded in 1,000 years, raising concerns about a major earthquake near Los Angeles. Scientists confirm stress buildup but emphasize unpredictability. A critical fault junction near LA may influence the next quake’s severity. No major rupture has occurred on these faults in over a century.
What's confirmed:
- The San Andreas and San Jacinto faults in Southern California have reached stress levels not seen in over 1,000 years, according to peer-reviewed research published June 3, 2026.
- No major earthquake has occurred near Los Angeles on these faults since at least 1918, heightening concerns about overdue seismic activity.
- A fault junction near Los Angeles could determine the size of the next major earthquake, with higher stress increasing the potential for a catastrophic rupture.
- Stress buildup does not guarantee an imminent earthquake, but models indicate conditions are more favorable for a large quake than at any recorded time in the past millennium.
- Scientists cannot predict when or if a major earthquake will strike, but the current stress levels are described as 'record' or 'highest in 1,000 years' across multiple studies.
Still unconfirmed:
- A 'megaquake' or 'apocalyptic earthquake' is 'inevitable' due to current stress levels, though this claim is not supported by direct predictions in primary sources.
- The term 'earthquake gate' refers to a critical fault junction near Los Angeles, but its exact role in triggering a quake remains speculative in secondary reporting.
- California is 'primed for an apocalyptic earthquake,' though no source provides a definition or evidence of what constitutes 'apocalyptic' in this context.