Gravity survey in the Cook Islands

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Abstract
The observed Bouguer gravity anomalies on the four volcanic islands (Mangaia, Mauke, Mitiaro, and Rarotonga) in the Southern Cook Group and Manihiki Atoll in the Northern Group are consistent with the calculated gravitational effects of uncompensated island platforms of average density 2·32 g/cm3 containing volcanic cores of average density 2·88 g/cm3. However, the anomalies on Rakahanga Atoll in the Northern Group are consistent with an uncompensated island platform having a uniform density of 2·52 g/cm3 and no core.

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