Global and regional surface-wave inversions: A spherical-spline parameterization
Article first published online: 7 DEC 2012
Copyright 1998 by the American Geophysical Union.
Geophysical Research Letters
Volume 25, Issue 2, pages 207–210, 15 January 1998
How to Cite
- Issue published online: 7 DEC 2012
- Article first published online: 7 DEC 2012
- Manuscript Accepted: 18 NOV 1997
- Manuscript Received: 26 AUG 1997
A surface-wave phase-velocity inversion scheme based upon a compactly supported cubic B-spline basis on a triangular grid of knots with approximately equal inter-knot spacing is implemented to perform global, regional and variable resolution inversions. Numerical results show that the inverted phase-velocity maps based upon this method are similar to those obtained using a global spherical-harmonic representation. Nonlinear inversions incorporating ray refraction are feasible based upon the spherical-spline model parameterization and the resulting maps are only slightly different from those based upon the great-circle approximation. A multiresolution analysis is introduced to obtain finer resolution in regions with good ray coverage and lower resolution in regions with poor coverage.