Gravity field over northern Eurasia and variations in the strength of the upper mantle

Details Gravity field over northern Eurasia and variations in the strength of the upper mantle Gravity field over northern Eurasia and variations in the strength of the upper mantle

Jan 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993sci...259..473k&link_type=abstract

Science (ISSN 0036-8075), vol. 259, no. 5094, p. 473-479.

Mathematics

Logic

21

Earth Gravitation, Earth Mantle, Gravity Anomalies, Asia, Europe, Geodynamics, Seismic Waves

Scientific paper

The correlation of long-wavelength gravity anomalies in northern Eurasia with seismic velocity anomalies in the upper mantle reverses in sign between western and eastern Eurasia. The difference between western and eastern Eurasia can be explained by the presence of a low-viscosity zone in the uppermost mantle beneath eastern Eurasia that is absent to the west. The location of the lateral change in viscosity corresponds with the geologic boundary between the older shields and platforms of the Baltics, Russia, and Siberia and the younger, geologically active mountain belts of eastern Asia. This relation provides evidence that differences in the strength of the upper mantle control the locus of intracontinental deformation.

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