New constraints on Laurentide postglacial rebound from absolute gravity measurements

Physics

Scientific paper

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Geodesy And Gravity, Geodesy And Gravity: Crustal Movements-Intraplate, Geodesy And Gravity: Rheology Of The Lithosphere And Mantle, Geodesy And Gravity: Standards And Absolute Measurements

Scientific paper

Repeated absolute gravity measurements have been made over a period of several years at six sites along a 3000 km-long, mid-continental, North American profile from the coast of Hudson Bay southward to Iowa. With the exception of the southern-most site, the observed rates of change of gravity are significantly higher than rates predicted by current models, such as ICE-3G and a laterally homogeneous, standard Earth. The observed gravity change rates suggest significant modifications, such as a 2 to 3-fold increase in lower mantle viscosity or a 50% increase in Laurentide ice sheet thickness west of Lake Superior.

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