Bulletin of the Seismological Society of America
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Bulletin of the Seismological Society of America; August 2008; v. 98; no. 4; p. 1797-1810; DOI: 10.1785/0120070297
© 2008 Seismological Society of America
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Finite-Frequency SKS Splitting: Measurement and Sensitivity Kernels

Anne Sieminski, Hanneke Paulssen, and Jeannot Trampert

Department of Earth Sciences, Utrecht University, P.O. Box 80021, TA 3058, Utrecht, The Netherlands

Jeroen Tromp

Seismological Laboratory, California Institute of Technology, Pasadena, California 91125

Splitting of SKS waves caused by anisotropy may be analyzed by measuring the splitting intensity, i.e., the amplitude of the transverse signal relative to the radial signal in the SKS time window. This quantity is simply related to structural parameters. Extending the widely used cross-correlation method for measuring travel-time anomalies to anisotropic problems, we propose to measure the SKS-splitting intensity by a robust cross-correlation method that can be automated to build large high-quality datasets. For weak anisotropy, the SKS-splitting intensity is retrieved by cross-correlating the radial signal with the sum of the radial and transverse signals. The cross-correlation method is validated based upon a set of Californian seismograms. We investigate the sensitivity of the SKS-splitting intensity to general anisotropy in the mantle based upon a numerical technique (the adjoint spectral-element method) considering the full physics of wave propagation. The computations reveal a sensitivity remarkably focused on a small number of elastic parameters and on a small region of the upper mantle. These fundamental properties and the practical advantages of the measurement make the cross-correlation SKS-splitting intensity particularly well adapted for finite-frequency imaging of upper-mantle anisotropy.






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