Physics
Scientific paper
Aug 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987sci...237..881h&link_type=abstract
Science (ISSN 0036-8075), vol. 237, Aug. 21, 1987, p. 881-883.
Physics
27
Boreholes, Gravitation Theory, Gravitational Constant, Gravitational Fields, Gravity Anomalies, Australia, Earth Rotation, Field Theory (Physics), Reefs, Stratigraphy
Scientific paper
Gravimetric measurements in a borehole within the Michigan Basin, obtained in September 1983, were utilized to estimate the Newtonian gravitational constant. Gravitational constants are computed using gravity measurements from two stations along the same vertical and by knowing the total rock mass sandwiched between these two stations. The calculation of rock formation density using a gamma-gamma density log is described. The gravity values are analyzed in terms of reference surface values, and it is observed that the gravity increases with depth. Borehole measurement determined gravity constant values ranged from 6.6901 + or - 0.0668 x 10 to the -11th cu m/kg sec sq (at station separation 264.5 + or - 0.5 m) to 6.7000 + or - 0.0650 x 10 to the -11th cu m/kg sec sq (at 1163.5 + or - 0.5 m), which are higher than the laboratory value of Luther and Towler (1982) of 6.672 + or - 0.0004 x 10 to the -11th cu m/kg sec sq. It is noted that the data correlate well with the values of Stacey (1981).
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