Abstract
SUMMARY We present a method for the computation offinite-frequency sensitivity kernels for two-station surface wave measurements. It is based on the combination of spectral-element modelling of seismic wave propagation, adjoint techniques and traveltime estimates from two-station crosscorrelations of seismograms. The analysis of sensitivity kernels for a 1-D earth model resulted in two major conclusions: (1) The finite-frequency sensitivity is zero along the interstation ray path for group velocity measurements obtained by cross-correlations. It follows that interstation group velocity measurements should not be made by cross-correlation if a raybasedinterpretationisused.(2)Althoughsensitivityalongtheinterstationraypathisdominant for phase velocity measurements, sensitivity far from the ray path can be large, depending on the details of the source–receiver geometry. The complexities of finite-frequency two-station sensitivity kernels should be taken into account to avoid misinterpretations and to improve the quality of tomographic inversions.
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