pure and applied geophysics

, Volume 163, Issue 2–3, pp 455–473 | Cite as

The Theory of Coda Wave Interferometry

Article

Abstract

Coda waves are sensitive to changes in the subsurface because the strong scattering that generates these waves causes them to repeatedly sample a limited region of space. Coda wave interferometry is a technique that exploits this sensitivity to estimate slight changes in the medium from a comparison of the coda waves before and after the perturbation. For spatially localized changes in the velocity, or for changes in the source location, the travel-time perturbation may be different for different scattering paths. The coda waves that arrive within a certain time window are therefore subject to a distribution of travel-time perturbations. Here I present the general theory of coda wave interferometry, and show how the time-shifted correlation coefficient can be used to estimate the mean and variance of the distribution of travel-time perturbations. I show how this general theory can be used to estimate changes in the wave velocity, in the location of scatterer positions, and in the source location.

Keywords

Monitoring scattering coda waves 

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Copyright information

© Birkhäuser Verlag, Basel, 2006

Authors and Affiliations

  1. 1.Center for Wave Phenomena and Department of GeophysicsColorado School of MinesGoldenU.S.A

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