Finite-frequency SKS Splitting: Measurement and sensitivity kernels

Anne Sieminski, Hanneke Paulssen, Jeannot Trampert, Jeroen Tromp

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

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-coffelation SKS-splitting intensity particularly well adapted for finite-frequency imaging of upper-mantle anisotropy.

Original languageEnglish (US)
Pages (from-to)1797-1810
Number of pages14
JournalBulletin of the Seismological Society of America
Volume98
Issue number4
DOIs
StatePublished - Aug 1 2008

Fingerprint

Correlation methods
Anisotropy
anisotropy
sensitivity
cross correlation
upper mantle
Earth mantle
body wave
Travel time
seismogram
Wave propagation
travel time
wave propagation
physics
Physics
seismograms
mantle
anomaly
Imaging techniques
travel

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Geochemistry and Petrology

Cite this

Sieminski, Anne ; Paulssen, Hanneke ; Trampert, Jeannot ; Tromp, Jeroen. / Finite-frequency SKS Splitting : Measurement and sensitivity kernels. In: Bulletin of the Seismological Society of America. 2008 ; Vol. 98, No. 4. pp. 1797-1810.
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Finite-frequency SKS Splitting : Measurement and sensitivity kernels. / Sieminski, Anne; Paulssen, Hanneke; Trampert, Jeannot; Tromp, Jeroen.

In: Bulletin of the Seismological Society of America, Vol. 98, No. 4, 01.08.2008, p. 1797-1810.

Research output: Contribution to journalArticle

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AU - Paulssen, Hanneke

AU - Trampert, Jeannot

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