Mathematics – Logic
Scientific paper
Mar 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992jgr....97.3285t&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 97, no. B3, March 10, 1992, p. 3285-3304.
Mathematics
Logic
73
Earth Planetary Structure, Environment Models, Glaciology, Sea Level, Structural Properties (Geology), Earth Mantle, Isostasy, Lithosphere, Viscoelasticity
Scientific paper
A global data base consisting of radiocarbon-controlled relative sea level (RSL) histories from 392 different geographic locations has been compiled for use in analyses of the glacial isostatic adjustment process. These data may be employed to constrain both the spatiotemporal characteristics of the last deglaciation event of the current ice age and the rheological structure of the planetary interior. In the present paper, following a description of the full data base and of the methods used to compile it, data from the sites that were not ice-covered (200 time series) are used to verify the plausibility of this refined model of deglaciation and to test the extent to which the totality of the observations constrain the radial viscoelastic structure of the planet. The analysis of solutions to the forward problem presented here reinforce previous inferences of a preference for a thick lithosphere by RSL data from sites along the U.S. east coast and a preference by data from most near-field sites for an increase in viscosity across the 670-km discontinuity in the mantle by a factor of approximately 2, when the viscosity of the upper mantle is fixed to the value of 10 exp 21 Pa s originally deduced by Haskel (1935) on the basis of his analysis of the data from Fennoscandia.
Peltier Richard W.
Tushingham A. M.
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