Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998geoji.132...61l&link_type=abstract
Geophysical Journal International, Volume 132, Issue 1, pp. 61-78.
Astronomy and Astrophysics
Astronomy
6
Coherence, Heterogeneity, Scattering
Scientific paper
Statistical parameters describing heterogeneity in the Proterozoic basement of the Baltic Shield were estimated from controlled-source seismic data, using a statistical inversion based on the theory of wave propagation through random media (WPRM), derived from the parabolic wave approximation. Synthetic plane-wave seismograms generated from models of random media show consistency with WPRM theory for forward propagation in the weak-scattering regime, whilst for two-way propagation a discrepancy exists that is due to contamination of the primary wave by backscattered energy. Inverse modelling of the real seismic data suggests that the upper crust to depths of ~ 15 km can be characterized, subject to the range of spatial resolution of the method, by a medium with an exponential spatial autocorrelation function, an rms velocity fluctuation of 1.5 +/- 0.5 per cent and a correlation length of 150 +/- 50 m. Further inversions show that scattering is predominantly occurring in the uppermost ~ 2 km of crust, where rms velocity fluctuation is 3 - 6 per cent. Although values of correlation distance are well constrained by these inversions, there is a trade-off between thickness of scattering layer and rms velocity perturbation estimates, with both being relatively poorly resolved. The higher near-surface heterogeneity is interpreted to arise from fractures in the basement rocks that close under lithostatic pressure for depths greater than 2 - 3 km.
Hobbs Richard W.
Hudson Andrew J.
Line E. R. C.
Snyder David B.
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