Mathematics – Logic
Scientific paper
Jun 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002georl..29k...2o&link_type=abstract
Geophysical Research Letters, Volume 29, Issue 11, pp. 2-1, CiteID 1507, DOI 10.1029/2001GL014285
Mathematics
Logic
4
Seismology: Body Wave Propagation, Seismology: Theory And Modeling, Seismology: Continental Crust (1242), Physical Properties Of Rocks: Acoustic Properties
Scientific paper
Seismic wave propagation within the crust is usually in directions not parallel to inherent rock symmetry axes due to geologic dips of structures and/or oblique-to-arcuate raypaths. We use Christoffel equations and petrophysically measured velocities of crustal metamorphic rocks to examine anisotropic velocities and traveltime effects as functions of non-axial propagation. P- and S-wave velocities are trigonometrically weighted between fast and slow axial velocities. Averaging over a range of non-axial angles yields effective velocities as encountered by through-going crustal raypaths. Axial velocities cannot be simply used to quantify crustal anisotropic effects. The angular behavior of P-wave delay and shear wave splitting are sensitive to VP measured diagonal to the material symmetry axes; this diagonal velocity controls the presence or absence of non-axial shear wave singularities. These behavior help quantify the contributions of crustal rocks to observations of seismic anisotropy which can serve as proxies for crustal deformation.
Christensen Nikolas I.
Okaya David A.
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