Regional and residual gravity fields, central North Island, New Zealand

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Abstract
Regional components of the central North Island Bouguer and isostatic gravity anomaly fields are presented as third-degree, two-way polynomials. The Bouguer regional contours strike northeast, except in the Bay of Plenty region, where contours parallel the coast. The isostatic regional contours strike uniformly north-east and go through a maximum which coincides with the axis of epicentres of intermediate depth earthquakes. The residual isostatic field shows four prominent negative anomalies in Central Volcanic Zone; three of these coincide with centres of rhyolitic volcanism.

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