Diffraction effects upon finite-frequency travel times: A simple 2-D example

Details Diffraction effects upon finite-frequency travel times: A simple 2-D example Diffraction effects upon finite-frequency travel times: A simple 2-D example

Jun 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998georl..25.1983t&link_type=abstract

Geophysical Research Letters, Volume 25, Issue 11, p. 1983-1986

Physics

23

Seismology, Seismology: Body Wave Propagation, Seismology: Theory And Modeling

Scientific paper

The widespread availability of broad-band digital seismic data makes it possible to measure travel-time anomalies by cross-correlation with spherical-earth synthetic seismograms. Finite-frequency diffraction effects render such measurements sensitive to wave-speed perturbations off of the infinite-frequency geometrical ray path. We show, by consideration of a simple 2-D example, that the Born approximation provides an excellent description of these off-path sensitivity effects, in the absence of caustics and for travel-time shifts that are small compared to the wave period. Remarkably, an isolated low-velocity anomaly may produce fringing fast travel-time anomalies, as measured by cross-correlation.

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