Abstract
Adopting the spectral approach, we derive the formulation of angular coherence and transverse coherence of transmission fluctuations. Our derivation and results provide new insight on transmission fluctuation analysis. A review of research work on fluctuation analysis using observations at large seismic arrays such as LASA and NORSAR-follows. We point out that the model of a single-layer Gaussian medium cannot explain the angular coherence of NORSAR data and a more general model of a non-Gaussian, multi-scale, vertically inhomogeneous random media is needed. The model of a two-layer power-law medium proposed by Flatté and Wu is among the simplest of such models.
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Wu, RS., Flatté, S.M. Transmission fluctuations across an array and heterogeneities in the crust and upper mantle. PAGEOPH 132, 175–196 (1990). https://doi.org/10.1007/BF00874362
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DOI: https://doi.org/10.1007/BF00874362