期刊
GEOPHYSICAL RESEARCH LETTERS
卷 28, 期 10, 页码 2109-2112出版社
AMER GEOPHYSICAL UNION
DOI: 10.1029/2000GL012611
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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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