Marine terraces as indicators of global geoidal and hydrological changes |
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| Authors: | Yu A Tarakanov Dr R K Klige A O Selivanov Dr |
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| Institution: | (1) Academy of Sciences, Earth Physics Institute, 10 Bolshaya Gruzinskaya, Moscow, Russia;(2) Moscow University, 119899 Moscow, Russia;(3) Academy of Sciences, Water Problems Institute, 13/3 Sadovo-Chernogryazskaya, 103064 Moscow, Russia |
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| Abstract: | Spatial pattern analysis of marine terrace elevations from 40–30 thous. years BP was used to reconstruct sea level/geoid surface
and geoid parameters during that time. The polar flattening of geodetic ellipsoid was lower than its present value (1/298.81
and 1/298.26) respectively because of glacial-induced mass redistribution. Increase in polar stress occurred during the last
30 thous. years was possibly driven by pertubation brought to the gravitational field by disintegration of polar ice sheets
in the Northern hemisphere. But the polar flattening value becomes only half-restored during the last deglacial hemicycle.
So repetitive glacial advances during Pleistocene acted as a global “pump” for uncondensed zones at the upper/lower mantle
boundary. Dissipation of tidal energy is an order of magnitude less intensive in its Earth's rotation effect.
A contribution to the International Geological Correlation Programme Project JGCP — 274 “Coastal Evolution in the Quaternary”. |
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