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Fragment of lost tectonic plate discovered where San Andreas and Cascadia faults meet
A hidden chunk of an ancient tectonic plate is stuck to the Pacific Ocean floor and sliding under North America, complicating earthquake risk at the Cascadia subduction zone.
A 6.0 magnitude earthquake strikes off Oregon coast, triggering tsunami alert and concerns of aftershocks, as the Cascadia Subduction Zone remains overdue for a catastrophic event.
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