The Greenland gravitational constant experiment.

Details The Greenland gravitational constant experiment. The Greenland gravitational constant experiment.

Sep 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990jgr....9515483z&link_type=abstract

Journal of Geophysical Research, Vol. 95, No. B10, p. 15483 - 15502

Physics

4

Earth: Gravitation, Gravitational Constant: Variations

Scientific paper

An Airy-type geophysical experiment was conducted in a 2-km-deep hole in the Greenland ice cap at depths between 213 m and 1673 m to test for possible violations of Newton's inverse square law. Gravity measurements were made at eight depths in 183-m intervals with a LaCoste & Romberg borehole gravity meter. An anomalous variation in gravity totaling 3.87 mGal (3.87x10-5m/s2) in the depth interval of 1460 m was observed. This may be attributed either to a breakdown of Newtonian gravity or to unexpected density variations in the rock below the ice.

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