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Geologists Find Anomalies, Pieces of Mantle Found Rising Under Cascadia Fault

July 25, 2018

https://scitechdaily.com/geologists-find-anomalies-pieces-of-mantle-found-rising

The 620-mile subduction zone, which hasn’t experienced a massive lengthwise earthquake since 1700, is where the Juan de Fuca ocean plate dips under the North American continental plate. The fault zone stretches just offshore from northern Vancouver Island to Cape Mendocino in northern California. The mantle is rising under the southern Gorda deformation zone at the north edge of the San Andreas Fault and under the Olympic Peninsula and southern Vancouver Island.