"The study's authors looked at the geological record of major seismic events on the Cascadia subduction zone and on the San Andreas, and found that major quakes on the northern San Andreas Fault were likely directly triggered by larger events in the Cascadia, occurring minutes, hours, or even days or months after. Specifically, the 9.0+-magnitude event that occurred in the Pacific Northwest in the year 1700"
"When you have one fault rupture, it transfers stress to nearby faults, in this case the northern part of the San Andreas fault. The issue is if there were a quake on the Cascadia, you wouldn't know if San Andreas would go off in 10 minutes or 10 years even as much as 50 years. But chances are it would be sooner than later"
Geological records indicate that large Cascadia subduction-zone ruptures have historically transferred stress to the northern San Andreas, often triggering major San Andreas earthquakes minutes to months or years later. Seafloor sedimentary evidence links the ~9.0 event in 1700 with a similarly large northern San Andreas quake within a relatively short interval. Stress transfer creates a wide range of possible response times—from minutes and hours to decades—though probabilities suggest a triggered response is more likely sooner rather than much later. A Cascadia rupture would therefore raise immediate elevated seismic hazard for the Bay Area and increase the urgency of preparedness.
Read at sfist.com
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