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Titolo: STATISTICAL INVERSION OF CONTROLLEDSOURCE SEISMIC DATA USING PARABOLIC WAVE SCATTERINGTHEORY
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:
 0956540X(1998)132:1<61:SIOCSD>2.0.ZU;2P
 Fonte:
 ISI
 Lingua:
 ENG
 Soggetto:
 UPPER MANTLE; RANDOMMEDIA; PWAVES; 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 CONTROLLEDSOURCE SEISMIC DATA USING PARABOLIC WAVE SCATTERINGTHEORY", Geophysical journal international, 132(1), 1998, pp. 6178
Abstract
Statistical parameters describing heterogeneity in the Proterozoic basement of the Baltic Shield were estimated from controlledsource seismic data, using a statistical inversion based on the theory of wave propagation through random media (WPRM), derived from the parabolic waveapproximation. Synthetic planewave seismograms generated from modelsof random media show consistency with WPRM theory for forward propagation in the weakscattering regime, whilst for twoway 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 36 per cent. Although values of correlation distance are well constrained by these inversions, there is a tradeoff between thickness of scattering layer and rms velocity perturbation estimates, with both being relatively poorly resolved. The higher nearsurface heterogeneity is interpreted to arise from fractures in the basement rocks that close under lithostatic pressure for depths greater than 23 km.
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Documento generato il 01/12/20 alle ore 19:15:30