Journal
GEOPHYSICAL JOURNAL INTERNATIONAL
Volume 164, Issue 3, Pages 569-578Publisher
OXFORD UNIV PRESS
DOI: 10.1111/j.1365-246X.2006.02870.x
Keywords
global seismology; ray theory; ray tracing; seismic anisotropy; spherical harmonics; surface waves
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We explain in detail how azimuthally anisotropic maps of surface wave phase velocity can be parametrized in terms of generalized spherical harmonic functions, and why this approach is preferable to others; most importantly, generalized spherical harmonics are the only basis functions adequate to describe a tensor field everywhere on the unit sphere, including the poles of the reference frame. We introduce here a new algorithm, designed specifically for the generalized harmonic parametrization, to trace surface wave ray paths in the presence of laterally varying azimuthal anisotropy. We describe the algorithm, and prove its reliability in view of future applications.
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