Abstract

Total-magnetic-intensity anomaly maps have been prepared for the region off the coasts of Washington, Oregon, and northern California. Two anomaly lineations reported in 1961 are shown to extend across the Continental Slope, and one of these extends to the mouth of the Strait of Juan de Fuca.

The results of anomaly-source depth calculations made at 49 points in the survey area are presented. Some apparent conclusions that can be made from the calculations are these: the crust off northern Oregon has an anomalous magnetic character at depth; the Mendocino fracture zone contains high-susceptibility material (possibly intruded) which dips toward the continent; and anomaly sources are located irregularly throughout the crust, the greatest source depth being 14.6 km for an anomaly off northern Oregon.

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