The “big one” might not come alone: Two major West Coast faults may strike back to back

ScienceDaily
Sep 23, 2026, 9:07 pm110 ptsTrending
The Cascadia subduction zone and northern San Andreas fault may sometimes rupture in rapid succession, according to evidence preserved in 3,100 years of ocean sediments. Researchers identified unusual sediment layers suggesting that earthquakes on the two systems have occurred just minutes to hours apart,…

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