Other
Scientific paper
Aug 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993georl..20.1663g&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 20, no. 15, p. 1663, 1664; Authors' Reply, p. 1665, 1666.
Other
8
Earth Mantle, Geodynamics, Seismology, Tomography, Topography, Continental Drift, Loads (Forces), Mathematical Models, Sea Level, Stratigraphy
Scientific paper
Forte et al. (1993) proposed a model of global dynamic topography with an amplitude of 3 km. Their critic argues that, if North America, Australia, and other continents were dynamically depressed by the 1-2 km predicted, then these continents would today be below sea level and nearly covered by epeiric seas. Since the continents are nearly entirely exposed and have become progressively exposed since the Late Mesozoic, the amplitude of the Forte et al. model is clearly much too large. Contemporaneous positioning of the continents in dynamic topography lows of large amplitude, as proposed by Forte et al., is at odds with the widthdrawal of shallow seas from the continents since the end of the Mesozoic. In their reply, Forte et al. contend that the critic's conclusion that their predicted kilometer-scale dynamic depressions of continental interiors will result in catastrophic flooding of the continents is incorrect because they treat dynamic topography as a perturbation to the topography which would exist in the absence of mantle convection, not as a perturbation to the observed topography. Global-scale surface topography which would exist in the absence of mantle convection is simply that due to the isostatic compensation of continent-ocean crustal density contrasts.
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