National Oceanic and
Atmospheric Administration
United States Department of Commerce


FY 1969

Fracture zones and magnetic anomalies south of the Aleutian Trench

Grim, P.J., and B.H. Erickson

J. Geophys. Res., 74(6), 1488–1494, doi: 10.1029/JB074i006p01488 (1969)

Magnetic anomalies south of the Aleutian trench between 164° and 180°W trend east–west. The magnetic pattern is disrupted at 173°W and 177°30'W by north–south-trending fracture zones named Amlia and Adak fracture zones, respectively. Correlation of magnetic anomaly profiles shows apparent left-lateral offsets of 220 km across the Amlia fracture zone and 30 km across the Adak fracture zone. The amplitudes of the anomalies are sharply reduced where they intersect the trench, resulting in a magnetically "quite zone" over most of the Aleutian trench and terrace. Although there are suggestions that the fracture zones extend north of the trench, the evidence is inconclusive.

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