Mathematics
Scientific paper
Sep 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994e%26psl.126..399f&link_type=abstract
Earth and Planetary Science Letters (ISSN 0012-821X), vol. 126, no. 4, p. 399-410
Mathematics
41
Asthenosphere, Earth Movements, Glaciology, Ice Environments, Lithosphere, Viscosity, Elastic Bodies, Glaciers, Mathematical Models
Scientific paper
The earth's response to the degalciation in Fennoscandia is modeled using a layered viscous model with an elastic lithosphere. The modeled tilting of palaeoshorelines at particular locations peripheral to the former ice load and the pattern of the present rate of uplift consistent with the observations strongly suggest a low-viscosity asthenosphere. Earth models without a low-viscosity asthenosphere give significant mismatch to the present rate of uplift, and are unable to mimic the observed tilting of palaeoshorelines. Models with a viscosity of the lower mantle of 1.0 - 2.0 x 10(exp 21) Pa s, and a viscosity of the upper mantle of 0.7 - 1.0 x 10(exp 21) Pa s overlain by low-viscosity asthenosphere with a thickness ranging from 25 to 100 km, fit equally well with the observations. It is suggested strongly that the asthenosphere has a thickness of less than 150 km and a viscosity of less than 7.0 x 10(exp 19) Pa s.
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