Abstract
This marine gravity and magnetic survey made in 1966 was designed to study the structural relationship between Porcupine Bank, Porcupine Bight and the continental shelf west of Ireland. The gravity results show that the continental margin which forms the western edge of Porcupine Bank is in isostatic equilibrium in accordance with Airy's hypothesis. Porcupine Bight, however, is characterised by a large positive Free-Air anomaly which is thought to be caused by high density material within the crust, or by a relatively thin crust. The magnetic results show large amplitude, long wavelength anomalies over the Porcupine Abyssal Plain, high frequency anomalies over the northern end of Porcupine Bank and a large negative anomaly over Porcupine Bight. The possibility of lateral movement of Porcupine Bank relative to the main continent is discussed with reference to observed geological and geophysical features in western Ireland.
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