Abstract
SUMMARY Teleseismic P-wave recordings are analysed in the frequency range 0.3‐6 Hz to derive structural (statistical) parameters of the lithosphere underneath the French Massif Central. For this we analyse diVerences in frequency-dependent intensities of the mean wavefield and the fluctuation wavefield. It is possible to discriminate a weak fluctuation regime of the wavefield in the frequency range below 1 Hz and a strong fluctuation regime starting above 1 Hz and continuing to higher frequencies. The observed wavefield fluctuations in the frequency range 0.3‐3 Hz can be explained by scattering of the teleseismic P wave front at elastic inhomogeneities in the lithosphere. A statistical distribution of the inhomogeneities is assumed and the concept of random media is applied. The lithospheric structure under the Massif Central can be described as a 70 km thick heterogeneous layer with velocity fluctuations of 3‐7 per cent and correlation lengths of the heterogeneities of 1‐16 km.
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