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

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, including around the massive Cascadia earthquake of 1700. If such synchronization happened again, several major West Coast cities could face emergencies at nearly the same time.

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

Owned by ScienceDaily. Added September 24, 2026 at 12:01 AM EDT.

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, including around the massive Cascadia earthquake of 1700. If such synchronization happened again, several major West Coast cities could face emergencies at nearly the same time.

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September 24, 2026 at 12:01 AM EDTLink resolvesPassed200200, text/html, 52526 characters
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