Neighbourhood inversion of teleseismic Ps conversions for anisotropy and layer dip

Details Neighbourhood inversion of teleseismic Ps conversions for anisotropy and layer dip Neighbourhood inversion of teleseismic Ps conversions for anisotropy and layer dip

Oct 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003geoji.155..200f&link_type=abstract

Geophysical Journal International, Volume 155, Issue 1, pp. 200-212.

Physics

13

Scientific paper

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.

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