Neighbourhood inversion of teleseismic Ps conversions for anisotrophy and layer dip

A. W. Frederiksen, H. Folsom, G. Zandt

Research output: Contribution to journalArticle

66 Scopus citations

Abstract

The inversion of teleseismic receiver functions for lithospheric structure is difficult due to the non-linearity of the problem, which is greatly increased in the presence of dipping interfaces and layer anisotropy. Given an efficient ray-theoretical tool for forward-modelling teleseismic seismograms, we perform a directed Monte Carlo search technique using the neighbourhood algorithm of Sambridge, enabling us to search 20-30 parameters in a reasonable amount of computer time. Tests on synthetic data reveal inherent velocity-depth trade-offs in typical data sets, due to the limited moveout present in teleseismic Ps; the azimuth of the anisotropic symmetry axis and the strike of a dipping interface prove to be well-resolved given adequate backazimuthal coverage. We apply this technique to two single-station data sets. The first, from permanent station PGC, Vancouver Island, British Columbia, displays dipping low-velocity sediment layers in the mid-crust. The second, from a station at the northern end of the Tibetan plateau operating in 1991 and 1992, requires a sequence of thick crustal anisotropic layers to explain the observed pattern of receiver-function arrivals.

Original languageEnglish (US)
Pages (from-to)200-212
Number of pages13
JournalGeophysical Journal International
Volume155
Issue number1
DOIs
StatePublished - Oct 1 2003

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Keywords

  • Anisotrophy
  • Inversion
  • Lithosphere
  • Seismology
  • Tibet
  • Vancouver Island

ASJC Scopus subject areas

  • Geophysics
  • Geochemistry and Petrology

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