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Keywords:

  • body waves;
  • Fréchet derivatives;
  • global seismology;
  • source time functions;
  • tomography;
  • traveltime

SUMMARY

The finite-frequency sensitivity kernels developed by Dahlen et al. are an appropriate tool for inverting traveltimes of non-triplicated P, S, PP and SS waves, measured by cross-correlation with a synthetic pulse. The critique of this theoretical methodology in a recent paper by de Hoop & van der Hilst is based upon the incorrect notion that one can account for errors in the synthetic pulse and/or origin time of an earthquake by a modification of the Fréchet kernels expressing the first-order dependence upon the perturbation in the wavespeed.