Inhomogeneities near the core-mantle boundary evidenced from scattered waves: A review |
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| Authors: | K Bataille R S Wu S M Flatté |
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| Institution: | (1) Physics Department and Institute of Tectonics, University of California, Santa Cruz, California, USA;(2) Present address: Institute of Geophysics, Chinese Academy of Sciences, Beijing, China |
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| Abstract: | Statistical properties of small-scale inhomogeneities (wavelengths between 20 and 70 km) near the core-mantle boundary are inferred from scattered core waves. Observations of scattered core waves at large seismic arrays and worldwide networks indicate that the inhomogeneities have a global nature with similar characteristics. However, there may exist a few regions having markedly stronger or weaker strengths. Scattering by volumetric inhomogeneities of about 1% inP-wave velocity in the lower mantle or by about 300 m of topographic relief of the core-mantle boundary can explain the observations. At present it is not possible to rule out either of these two alternatives, or a combination of both. |
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| Keywords: | Scattering wave propagation seismic waves core-mantle topography inhomogeneities |
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