Prior to and during the early 1960s several "sparker" and conventional survey lines were run across the head of Eel Canyon, which lies 7 miles west of the mouth of the Eel River, Humboldt County, California, and on the adjacent shelf area. The data from the surveys were utilized to discover if a "buried" canyon exists below the shelf sediments.

Interpretation of the seismic records indicates that a buried canyon does extend shoreward from the present-day canyon. Furthermore, this buried canyon consists of two branches; one branch is oriented toward Arcata Bay in the north Humboldt Bay area and the other branch is oriented toward South Bay in the south Humboldt Bay area.

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