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Operto, S.
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- PublicationOpen AccessQuantitative imaging of complex structures from multi-fold wide-aperture seismic data: a case study(2004-07-01)
; ; ; ; ; ; ;Operto, S.; UMR Geoscience Azur, CNRS, Villefrance-sur-Mer, France ;Ravaut, C.; UMR Geoscience Azur, CNRS, Villefrance-sur-Mer, France ;Improta, L.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italia ;Virieux, J.; UMR Geoscience Azur, CNRS, Villefrance-sur-Mer, France ;Herrero, A.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italia ;Dell'Aversana, P.; ENI S.p.A S.Donato Milanese, Milano, Italy; ; ; ; ; An integrated multi-scale seismic imaging flow including first-arrival traveltime tomography and waveform inversion is applied to dense onshore wide-aperture seimsic data recorded in a complex geological setting (southern Apennines thrust belt, Italy)206 73 - PublicationOpen AccessHigh-resolution imaging of basin-bounding normal faults in the Southern Apennines seismic belt (Italy) by traveltime and frequency-domain full-waveform tomography(2008-06-09)
; ; ; ; ;Improta, L.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italia ;Operto, S.; CNRS, Nice, France ;Piromallo, C.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italia ;Valoroso, L.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione CNT, Roma, Italia; ; ; ; ; ;Operto, S.; CNRSWe apply a two-step seismic imaging flow by combined first-arrival traveltime and frequency-domain waveform tomographies to dense wide aperture data collected in the Val d’Agri basin (southern Italy). A large wavelength Vp model determined by first-arrival traveltime tomography is used as a starting model for waveform tomography. The multiscale waveform tomography consisting of successive inversion of increasing frequencies allows to progressively reconstruct the short wavelengths of the velocity model, providing valuable information on the Quaternary basin and on range-bounding normal-faulting systems.220 172 - PublicationOpen AccessQuantitative seimsic imaging of complex structures for seismic hazard estimation and for reservoir characterization: a key strategy(2003-09-22)
; ; ; ; ;Virieux, J.; UMR Geosciences Azur, CNRS, Nice ;Operto, S.; UMR Geosciences Azur, CNRS, Nice ;Improta, L.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italia ;Dell'Aversana, P.; Eni, S.p.a., Milano, Italia; ; ; ; ; ; ; ;Pecce, M.; Università degli Studi del Sannio ;Manfredi, G.; Università degli Studi di Napoli ;Zollo, A.; Università degli Studi di Napoli; ; Seismic imaging of complex structures remains a challange, while sub-surface characterization becomes a crucial issue for safety, resources and wastes. When highly dense seismic profiles are available, global offset data can be simultaneously used for a full waveform inversion with the background initial Vp model provided by traveltime tomography. We show an application of combined traveltime and full-waveform tomographies performed on global offset crustal data collected in Southern Italy.145 162 - PublicationOpen AccessMultiscale imaging of complex structures from multi-fold wide-aperture seismic data by frequency-domain full-waveform inversion: application to a thrust belt(2004-08-02)
; ; ; ; ; ; ;Ravaut, C.; UMR Gescience Azur, CNRS, Villefrance-sur-mer, France ;Operto, S.; UMR Gescience Azur, CNRS, Villefrance-sur-mer, France ;Improta, L.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italia ;Virieux, J.; UMR Gescience Azur, CNRS, Villefrance-sur-mer, France ;Herrero, A.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italia ;Dell'Aversana, P.; ENI S.p.A., San Donato Milanese, Milano, Italy; ; ; ; ; An application of full-waveform tomography to dense onshore wide-aperture seismic data recorded in a complex geological setting (thrust belt) is presented. The waveform modelling and tomography are implemented in the frequency domain. The modelling part is solved with a finite-difference method applied to the visco-acoustic wave equation. The inversion is based on a local gradient method. Only the P-wave velocity is involved in the inversion. The inversion is applied iteratively to discrete frequency components by proceeding from low to high frequencies. This defines a multiscale imaging in the sense that high wavenumbers are progressively incorporated in images. The linearized waveform tomography requires an accurate starting velocity model that has been developed by first-arrival traveltime tomography. After specific pre-processing of the data, 16 frequency components ranging between 5.4 and 20 Hz were inverted. Ten iterations were computed per frequency component leading to 160 tomographic models. The waveform tomography has successfully imaged southwest dipping structures previously identified from other geophysical data as being associated with high-resistivity bodies. The relevance of the tomographic images is locally demonstrated by comparison of a velocity–depth function extracted from the waveform tomography models with a coincident vertical seismic profiling (VSP) log available on the profile. Moreover, comparison between observed and synthetic seismograms computed in the (starting) traveltime and waveform tomography models demonstrates unambiguously that the waveform tomography successfully predicts for wide-angle reflections from southwest-dipping geological structures. This study demonstrates that the combination of first-arrival traveltime and frequency domain full-waveform tomographies applied to dense wide-aperture seismic data is a promising approach to quantitative imaging of complex geological structures. Indeed, wide-aperture acquisition geometries offer the opportunity to develop an accurate background velocity model for the subsequent waveform tomography. This is critical, because the building of the macromodel remains an open question when only near-vertical reflection data are considered.183 114