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Titolo:
STATISTICAL INVERSION OF CONTROLLED-SOURCE SEISMIC DATA USING PARABOLIC WAVE SCATTERING-THEORY
Autore:
LINE CER; HOBBS RW; HUDSON JA; SNYDER DB;
Indirizzi:
MOBIL N SEA LTD,3 CLEMENTS INN LONDON WC2A 2EB ENGLAND BIRPS,BULLARD LABS CAMBRIDGE CB3 0EZ ENGLAND UNIV CAMBRIDGE,DEPT APPL MATH & THEORET PHYS CAMBRIDGE CB3 9EW ENGLAND
Titolo Testata:
Geophysical journal international
fascicolo: 1, volume: 132, anno: 1998,
pagine: 61 - 78
SICI:
0956-540X(1998)132:1<61:SIOCSD>2.0.ZU;2-P
Fonte:
ISI
Lingua:
ENG
Soggetto:
UPPER MANTLE; RANDOM-MEDIA; P-WAVES; CRUST; NORSAR; LASA; HETEROGENEITIES; FLUCTUATIONS; PROPAGATION; FIELDS;
Keywords:
COHERENCE; HETEROGENEITY; SCATTERING;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
36
Recensione:
Indirizzi per estratti:
Citazione:
C.E.R. Line et al., "STATISTICAL INVERSION OF CONTROLLED-SOURCE SEISMIC DATA USING PARABOLIC WAVE SCATTERING-THEORY", Geophysical journal international, 132(1), 1998, pp. 61-78

Abstract

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 waveapproximation. Synthetic plane-wave seismograms generated from modelsof 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 similar to 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 of150 +/- 50 m. Further inversions show that scattering is predominantly occurring in the uppermost similar to 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.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 01/12/20 alle ore 19:15:30