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Detailed Reference Information |
Shoberg, T. and Bina, C.R. (1994). Some effects of anisotropy on velocity contrasts between subducting lithosphere and overriding mantle. Geophysical Research Letters 21: doi: 10.1029/94GL01613. issn: 0094-8276. |
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We compute velocity anisotropy for three models of preferred crystal alignment due to finite strain in the mantle which, when juxtaposed with computed anisotropy in subducted lithosphere and neglecting other effects, give velocity contrasts that we compare with those observed. We find a strong dip dependence for computed velocity contrasts due to slow axis alignment in the overriding mantle perpendicular to the slab-mantle interface. Moreover, for an isotropic mantle wedge or convergence-parallel flow, it is difficult to produce greater velocity in the subducting slab than the overlying mantle for near-vertical propagation even with high strain rates. We do, however, obtain positive contrasts using a dip axis-parallel flow model, which is the only one that yields contrasts that approach observations from the Japan Trench. ¿ American Geophysical Union 1994 |
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Abstract |
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Keywords
Mineral Physics, Elasticity and anelasticity, Seismology, Structure of the lithosphere and upper mantle, Tectonophysics, Dynamics of the lithosphere and mantle, Information Related to Geographic Region, Pacific Ocean |
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Publisher
American Geophysical Union 2000 Florida Avenue N.W. Washington, D.C. 20009-1277 USA 1-202-462-6900 1-202-328-0566 service@agu.org |
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