ELASTIC WAVE PROPAGATION IN ANISOTROPIC CRUSTAL MATERIAL POSSESSING ARBITRARY INTERNAL TILT

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dc.contributor.author Okaya D.A.
dc.contributor.author McEvilly T.V.
dc.date.accessioned 2022-01-24T03:31:15Z
dc.date.available 2022-01-24T03:31:15Z
dc.date.issued 2003
dc.identifier https://elibrary.ru/item.asp?id=1493262
dc.identifier.citation Geophysical Journal International, 2003, 153, 2, 344-358
dc.identifier.issn 0956-540X
dc.identifier.uri https://repository.geologyscience.ru/handle/123456789/34537
dc.description.abstract Geological causes of crustal anisotropy include regional fractures and cracks, isotropic heterogeneity or layering and material composition and textural properties. In addition, shear or metamorphic foliations in fault zones or structural terranes can serve as proxies for intracrustal deformation in a manner analogous to the lattice-preferred orientation of olivine produced by mantle shear. The primary factor in the production of crustal anisotropy is the relative angle between a seismic wave and the (dipping) symmetry axes of crustal material as either change along the propagation ray path. Complex and heterogeneous, crustal material is not necessarily oriented with vertical/horizontal symmetry axes, but is more normally tilted in accordance with structure. Calculation of the anisotropic response to material tilt for elastic seismic wave propagation requires rotation of the stiffness tensors describing the crustal material. We examine the alteration of anisotropic stiffness tensors and provide rotation directional cosines based on geological measurements. Material tilt produces strong effects in examples of 2-D and 3-D finite-difference synthetic seismograms that might otherwise be attributed to velocities or structure in other regions of the crust or mantle.
dc.subject ELASTIC-WAVE THEORY
dc.subject FINITE-DIFFERENCE METHODS
dc.subject SEISMIC ANISOTROPY
dc.subject SEISMIC MODELLING
dc.subject SEISMIC WAVE PROPAGATION
dc.title ELASTIC WAVE PROPAGATION IN ANISOTROPIC CRUSTAL MATERIAL POSSESSING ARBITRARY INTERNAL TILT
dc.type Статья


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