Abstract
Faults on the outer wall of the northern Peru—Chile trench, seaward of the Lima Basin, Arica Bight, and Iquique Basin, parallel the trend of Nazca plate magnetic anomalies. Where the Nazca Ridge enters the subduction zone, faulting parallels the trench, probably reflecting a lack of spreading fabric on the ridge. Seaward of the Yaquina Basin, faulting does not parallel the trench or the spreading fabric, possibly reflecting stress changes caused by N—S extension across the nearby Mendana fracture zone. These results generally agree with a previous review of subduction-related faulting, which concluded that faults parallel the spreading fabric where it differs from the strike of the dipping slab by less than 30°.
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