subduction zone

noun

geology a long narrow, often arcuate, zone along which subduction takes place

subduction zone

A convergent plate boundary where one plate subducts beneath the other, usually because it is denser. The western coast of South America is roughly coincident with a subduction zone in which a plate consisting of ocean floor is subducting beneath the continental mass of South America.

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Cascadia scenario: Given its proximity to the Cascadia subduction zone, Del Norte County — the state’s northernmost coastal region — is perhaps more exposed to tsunami risk than any other part of California.

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“A large quake generated by the Cascadia subduction zone could create waves twice as large as the 1964 event, especially in Crescent City,” Rick Wilson, a former head of the California Geological Survey tsunami program, said in a statement.

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Also, eruptions at Axial Seamount aren’t expected to trigger a long-feared magnitude 9.0 earthquake on the Cascadia subduction zone.

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Those are the findings of a new study that examined the repercussions of a massive earthquake on the Cascadia subduction zone, which stretches from Northern California up to Canada’s Vancouver Island.

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The last megaquake on the Cascadia subduction zone, a magnitude 9 monster, occurred in 1700.

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subduction subdue

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