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Finite-Frequency SKS Splitting: Measurement and Sensitivity Kernels

Sieminski, Anne and Paulssen, Hanneke and Trampert, Jeannot and Tromp, Jeroen (2008) Finite-Frequency SKS Splitting: Measurement and Sensitivity Kernels. Bulletin of the Seismological Society of America, 98 (4). pp. 1797-1810. ISSN 0037-1106. doi:10.1785/0120070297.

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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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Tromp, Jeroen0000-0002-2742-8299
Additional Information:© 2008 Seismological Society of America. Manuscript received 4 December 2007. We thank Guust Nolet and an anonymous reviewer for helpful comments and suggestions. The BDSN waveform data have been obtained thanks to the Northern California Earthquake Data Center (NCEDC). The adjoint spectral-element computations discussed in this article were performed on Caltech’s Division of Geological & Planetary Sciences Dell cluster. The source code for the adjoint spectral-element simulations is freely available from We gratefully acknowledge support from the European Commission’s Human Resources and Mobility Programme, Marie Curie Research Training Networks, FP6, and from the National Science Foundation under Grant Number EAR-0711177. This is contribution Number 9002 of the Division of Geological & Planetary Sciences, California Institute of Technology.
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European CommissionUNSPECIFIED
National Science FoundationEAR-0711177
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Division of Geological and Planetary Sciences Contribution9002
Issue or Number:4
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ID Code:11592
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Deposited On:09 Sep 2008 03:42
Last Modified:08 Nov 2021 22:00

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