Time corrections to teleseismic P delays derived from SKS splitting parameters and implications for western U.S. P-wave tomography

Details Time corrections to teleseismic P delays derived from SKS splitting parameters and implications for western U.S. P-wave tomography Time corrections to teleseismic P delays derived from SKS splitting parameters and implications for western U.S. P-wave tomography

Oct 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011georl..3819304o&link_type=abstract

Geophysical Research Letters, Volume 38, Issue 19, CiteID L19304

Physics

Seismology: Body Waves, Seismology: Mantle (1212, 1213, 8124), Seismology: Tomography (6982, 8180)

Scientific paper

Upper mantle anisotropy will affect teleseismic P-wave arrival times and create artifacts in isotropic travel-time tomography. Compiled SKS splitting results indicate variations in the strength and orientation of azimuthal anisotropy beneath the western U.S. We use SKS splitting parameters and a hexagonally anisotropic elastic tensor (fast symmetry axis) to estimate azimuthal anisotropy contributions to P-wave delay times and evaluate the effects on isotropic P-wave tomography. Estimated anisotropy correction times have a root-mean-square (RMS) value of 0.16 s, which is 37% of P-wave delay time RMS. The magnitude of azimuthal anisotropy, rather than its azimuth, has the strongest effect on P delay times; however, if the anisotropy symmetry axis has a plunge, P-wave travel times may be strongly affected by both magnitude and azimuth. Applying azimuthal anisotropy corrections significantly increases tomographic P-wave velocity beneath the High Lava Plains and central California coast, and decreases velocity beneath the Great Basin.

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