Gravity Anomalies and Their Relation to Major Tectonic Features in the North-central Pacific

William H. Lucas

Jän. 1971 · National Oceanic and Atmospheric Administration, Environmental Research Laboratories

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Gravity anomalies in the north-central Pacific have been obtained aboard the USC&GS Ship Surveyor with a LaCoste and Romber surface-ship gravity meter. The data lie along several profiles from the Hawaiian Archipelago to 39°N between 167°W and 173°30'W and extend across the north side of the Hawaiian Archipelago and portions of the Murray, Pioneer, Mendocina and Surveyor fracture zones. The accuracy of measurements is estimated to be within ± 5 mgal and the data are in agreement with those published by Worzel on the basis of 1948 submarine pendulum measurements. Maps of free-air and Bouguer anomalies are presented and some of their crustal structural implications are discussed.