GNGTS 2016 - Atti del 35° Convegno Nazionale

498 GNGTS 2016 S essione 3.1 multichannel filtering and dedicated coherency enhancement operators. The wavelet used in the finite-difference modeling is estimated from the data and to relax the assumption on the phase of the wavelet we adopt the envelope of the observed and predicted data in the misfit computation. The main result obtained consists in a velocity increase at a depth of about 1 km that slightly deepens moving to the right of the profile (North) in agreement with the geological setting of the area. Ongoing works are focused on the estimation of a velocity model by means of travel time tomography to be compared with the model obtained from the FWI. Future works include the possibility to use this final model as a starting point for a subsequent local FWI. References Al-Yaqoobi A. and Warner M.; 2013: Full waveform inversion – dealing with limitations of 3D onshore seismic data. 83 th Annual international Meeting, SEG , Expanded Abstract. Brossier R., Operto S. and Virieux J.; 2009: Seismic imaging of complex onshore structures by 2D elastic frequency- domain full-waveform inversion. Geophysics , 74 , no . 6, WCC105–WCC118. Galuzzi B., Tognarelli A., Stucchi E. and Mazzotti A.; 2016: Stochastic FWI on wide-angle land data with different order of approximation of the 2D acoustic wave equation. 78th Conference & Exhibition, EAGE, Expanded Abstract. Guasch L., Burgess T. and Warner M.; 2015: Optimised adaptive waveform inversion - improved convergence via conjugate gradients and superior step-length calculation. 77th Conference & Exhibition, EAGE, Expanded Abstract. Plessix R. E., Baeten G., de Maag J. W., Klaassen M., Rujie Z. and Zhifei T.; 2010: Application of acoustic full waveform inversion to a low-frequency large-offset land data set. 80 th Annual international Meeting, SEG, Expanded Abstract. Sajeva A., Bienati N., Aleardi M., Stucchi E. and Mazzotti A.; 2014a: Estimation of velocity macro-models using stochastic full-waveform inversion. 84 th Annual international Meeting, SEG , Expanded Abstract. Scrocca D., Doglioni C., Innocenti F., Manetti P., Mazzotti A., Bertelli L., Burbi L. and D’Offizi S.; 2003: CROP ATLAS: seismic reflection profiles of the Italian crust. Memorie Descrittive della Carta Geologica d’Italia 62, 15–46. Sirgue L., Barkved O.I., Dellinger J., Etgen J., Albertin U. and Kommedal J.H.; 2010: Full waveform inversion: The next leap forward in imaging at Valhall. First Break , 28 , 65–70. Stucchi E., Zanzi L. and Mazzotti A.; 2003: Lessons learned from the acquisition and processing of the CROP C- ALPS/b, CROP 03, CROP 04, CROP 18 NVR and expanding spread seismic data. Memorie Descrittive Carta Geologica d’Italia. , 62 , 75-88. Tognarelli A., Stucchi E., Bienati N., Sajeva A., Aleardi M. and Mazzotti A.; 2015 Two-grid stochastic full waveform inversion of 2D marine seismic data. ��77 th Conference & Exhibition, EAGE , Expanded Abstract.