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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.

“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.

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

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.

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