Elastic wave anisotropy in the upper mantle
نویسندگان
چکیده
منابع مشابه
Upper mantle anisotropy beneath the Geoscope stations
Seismic anisotropy has been widely studied this last decade, particularly by measuring splitting of vertically propagating core shear waves. The main interest in this technique is to characterize upper mantle flow beneath seismic stations. On the other hand, the major restriction in this method is that a single station gives a single anisotropy measurement. Alternative methods have been develop...
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Flow induced mineral alignment in the Earth s mantle affects the nature of seismic wave propagation. Since measurements of seismic travel-time and shear wave splitting are a key means by which the structure of the upper mantle can be imaged, it is important to understand the factors that contribute to variability in elastic properties. Seismic anisotropy associated with lattice preferred orient...
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Isotropic earth models are unable to provide uniform fits to the gross Earth normal mode data set or, in many cases, to regional Loveand Rayleigh-wave data. Anisotropic inversion provides a good fit to the data and indicates that the upper 200 km of the mantle is anisotropic. The nature and magnitude of the required anisotropy, moreover, is similar to that found in body wave studies and in stud...
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Tube-wave speed in the presence of a weakly anisotropic formation can be expressed in terms of an effective shear modulus for an equivalent isotropic formation. When combined with expressions for the speeds of the SHand quasi-SV-waves along the borehole axis, a simple inversion procedure can be obtained to determine three of the five elasticities of a transversely isotropic (TI) formation tilte...
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ژورنال
عنوان ژورنال: Geophysical Journal International
سال: 1987
ISSN: 0956-540X,1365-246X
DOI: 10.1111/j.1365-246x.1987.tb06650.x