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Western Earth Surface Processes Team

Geologic Mapping Data

Eureka 30 x 60 Degree Quadrangle, Northern California

Publication Reference: Robert J. McLaughlin, S.D. Ellen, M.C. Blake, Jr., Angela S. Jayko, W.P. Irwin, K.R. Aalto, G.A. Carver, and S.H. Clarke Jr., 2000, Geology of the Cape Mendicino, Eureka, Garberville, and Southwestern Part of the Hayfork 30 x 60 Minute Quadrangles and Adjacent Offshore Area, Northern California: U.S. Geological Survey MF Map 2336, <>.

The Cape Mendocino and Eureka maps depict the geology of the Mendocino triple junction. This area includes the southern end of the Cascadia subduction margin; the northern end of the San Andreas right-lateral transform fault system; and one of the most seismically active yet least understood structural provinces in the world. This area was the site of the 1991 magnitude 6.0 and 1992 magnitude 7.1 Cape Mendocino (Honeydew and Petrolia) earthquakes.

. Northern California Willows Quadrangle Hayfork Quadrangle Susanville Quadrangel Lake Almanor Quadrangle Red Bluff Quadrangle Covelo Quadrangle Garberville Quadrangle Cape Mendocino Quadrange Eureka Quadrangle

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