Postglacial rebound in a non-Newtonian spherical Earth

被引:32
作者
Giunchi, C
Spada, G
机构
[1] Ist Nazl Geofis, I-00143 Rome, Italy
[2] Univ Urbino, Ist Fis, I-61029 Urbino, Italy
关键词
D O I
10.1029/2000GL011460
中图分类号
P [天文学、地球科学];
学科分类号
07 ;
摘要
Using finite-elements we study the postglacial rebound in an axisymmetric Earth with a non-Newtonian rheology. Our approach allows for the first time a self-consistent study of the effect of a power-law creep on the long-wavelength deformations, which cannot be performed using flat models. We show that, for a non-Newtonian upper mantle, the time-variations of the low-degree Stokes coefficients become largely insensitive to the viscosity of the lower mantle. This is in contrast with previous evidence based on Newtonian models, which emphasized the importance of the low degree signatures for constraining the lower mantle viscosity.
引用
收藏
页码:2065 / 2068
页数:4
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