What is the "Big One"?
It refers to a potentially catastrophic earthquake along the Cascadia subduction zone.
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News / Science
The 'Big One' Earthquake Threat: Worse Than Scientists Thought
Experts warn that the earthquake threat known as the "Big One" could be even more catastrophic than previously feared, potentially triggering a domino effect that could devastate the West Coast. A recent study suggests a seismic event on th...
Key Insights
- A study from Oregon State University indicates a seismic event on the Cascadia subduction zone could trigger the San Andreas fault.
- If both faults went off, it would create a multi-state emergency from San Francisco to Vancouver.
- Historical data shows very few instances of simultaneous quakes in the last 1,500 years, with the most recent in 1700.
- The synchronization of these faults was discovered accidentally during a sediment core examination.
In-Depth Analysis
The study, led by Chris Goldfinger, a marine geologist at Oregon State University, examined ancient sediment layers from both the Cascadia subduction zone and the San Andreas fault. The team found similarities in timing and structure, suggesting a seismic synchronization between the faults. Goldfinger's accidental discovery in 1999, when he mistakenly drilled into the San Andreas zone, led to the finding of simultaneous quake evidence. The original study, published in September 2025, is titled "Unravelling the dance of earthquakes: Evidence of partial synchronization of the northern San Andreas fault and Cascadia megathrust."
FAQ
What could happen if both faults rupture together?
San Francisco, Portland, Seattle, and Vancouver could all face emergency situations simultaneously.
How often have these simultaneous quakes occurred?
Very few times in the last 1,500 years, with the most recent around 1700.
Takeaways
- The earthquake threat in the Pacific Northwest and California could be greater than previously understood.
- Emergency response planning should consider the possibility of simultaneous fault ruptures.
- Further research is needed to fully understand the synchronization between the Cascadia subduction zone and the San Andreas fault.
Discussion
Do you think the West Coast is prepared for a synchronized earthquake event? Share your thoughts in the comments!
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Sources
Disclaimer
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