Improved inversion for seismic structure using transformed, S-wavevector receiver functions: Removing the effect of the free surface

Details Improved inversion for seismic structure using transformed, S-wavevector receiver functions: Removing the effect of the free surface Improved inversion for seismic structure using transformed, S-wavevector receiver functions: Removing the effect of the free surface

Oct 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003georl..30ssde3r&link_type=abstract

Geophysical Research Letters, Volume 30, Issue 19, pp. SDE 3-1, CiteID 1981, DOI 10.1029/2003GL018090

Physics

8

Seismology: Body Wave Propagation, Seismology: Lithosphere And Upper Mantle, Seismology: Theory And Modeling, Seismology: General Or Miscellaneous, Seismology: Instruments And Techniques

Scientific paper

The determination of structure from the inversion of teleseismic receiver functions may be improved by removing the contribution of the free surface. The free surface interaction gives rise to the highest amplitude signal on standard receiver functions and yet this initial pulse tells us little about the receiver structure below the surface layer. We apply a transformation to P, S and Horizontal wavevector components, which removes the free surface response and hence the initial P-pulse. A ``pure'' receiver function is calculated by deconvolving the S-wavevector component with the P-wavevector. In general, converted phase amplitudes within the receiver function waveform are better matched by the inverse algorithm, resulting in an improved estimation of seismic structure. In particular, low amplitude receiver function waveforms, often associated with poorly constrained structure, now yield a successful inverse.

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