Secular gravity changes: measurements and predictions for selected Canadian sites

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Abstract
Secular variations in surface gravity (ġ) over Canada are dominated by the Late Wisconsin deglaciation signal. Theoretical modelling of this deglaciation shows that the maximum values for ġ are to be expected around Hudson Bay. Using the JILA-2 absolute gravity apparatus of the Geological Survey of Canada, it should be possible to determine ġ at three sites near Hudson Bay by about 1993 and at more sites soon afterward. Secular rates of the ongoing postglacial-adjustment process will soon be determined at inland sites where no contemporary rates have been available.

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