Transmission fluctuations across an array and heterogeneities in the crust and upper mantle |
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Authors: | Ru-Shan Wu Stanley M Flatté |
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Institution: | (1) Institute of Geophysics, Chinese Academy of Sciences, Beijing, China;(2) Physics and Institute of Tectonics, University of California, 95064 Santa Cruz, CA, USA |
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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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Keywords: | Wave propagation seismic waves heterogeneities lithosphere |
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