期刊
BULLETIN OF THE SEISMOLOGICAL SOCIETY OF AMERICA
卷 109, 期 5, 页码 1716-1728出版社
SEISMOLOGICAL SOC AMER
DOI: 10.1785/0120190060
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资金
- Australian Government Research Training Program (RTP) Scholarship
- European Union [716542]
- Seismological Facilities for the Advancement of Geoscience and EarthScope (SAGE) Proposal of the National Science Foundation [EAR-1261681]
- European Research Council (ERC) [716542] Funding Source: European Research Council (ERC)
A method of extracting group and phase velocity dispersions jointly for Love- and Rayleigh-wave observations is presented. This method uses a spectral element representation of a path average Earth model parameterized with density, shear-wave velocity, radial anisotropy, and V-P/V-S ratio. An initial dispersion curve is automatically estimated using a heuristic approach to prevent misidentification of the phase. A second step then more accurately fits the observed noise correlation function (NCF) between interstation pairs in the frequency domain. For good quality cross correlations with reasonable signal-to-noise ratio, we are able to very accurately fit the spectrum of NCFs and hence obtain reliable estimates of both phase and group velocity jointly for Love and Rayleigh surface waves. In addition, we also show how uncertainties can be estimated with linearized approximations from the Jacobians and subsequently used in tomographic inversions.
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