Scattering parameters of the lithosphere below the Massif Central, France, from teleseismic wavefield records

Details Scattering parameters of the lithosphere below the Massif Central, France, from teleseismic wavefield records Scattering parameters of the lithosphere below the Massif Central, France, from teleseismic wavefield records

Jul 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998geoji.134..187r&link_type=abstract

Geophysical Journal International, Volume 134, Issue 1, pp. 187-198.

Astronomy and Astrophysics

Astronomy

10

Lithosphere, Massif Central, Scattering, Wavefield Fluctuations

Scientific paper

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 differences 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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