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Authors: Corciulo, M.* 
Zollo, A.* 
Vassallo, M.* 
Dell'Aversana, P.* 
Morandi, S.* 
Title: Depth and morphology of reflectors from the non-linear inversion of arrival times and waveforms semblance data. Part II: Modelling and interpretation of real data acquired in Southern Apennines, Italy
Journal: Geophysical Prospecting 
Series/Report no.: /56(2008)
Publisher: Blackwell publishing
Issue Date: Oct-2008
DOI: 10.1111/j.1365-2478.2008.00691.x
Keywords: Southern Apennines
non-linear inversion
Subject Classification04. Solid Earth::04.02. Exploration geophysics::04.02.06. Seismic methods 
Abstract: In order to retrieve a 2D background velocity model and to retrieve the geometry and depth of shallow crustal reflectors in the Southern Apennines thrust belt a separate inversion of first arrival traveltimes and reflected waveforms was performed. Data were collected during an active seismic experiment in 1999 by Enterprise Oil Italiana and Eni-Agip using a global offset acquisition geometry. A total of 284 on-land shots were recorded by 201 receivers deployed on an 18 km line oriented SW–NE in the Val D’Agri region (Southern Apennines, Italy). The two-step procedure allows for the retrieval of a reliable velocity model by using a non-linear tomographic inversion and reflected waveform semblance data inversion. The tomographic model shows that the P wave velocity field varies vertically from approximately 3 km/s to 6 km/s within 4 km from the Earth’s surface. Moreover, at a distance of approximately 11 km along the profile, there is an abrupt increase in the velocity field. In this zone indeed, an ascent from 2 km depth to 0 km above sea level of the 5.2 km/s iso-velocity contour can be noted. The retrieved velocity can be associated with Plio-Pleistocene clastic deposits outcropping in the basin zone and with Mesozoic limestone deposits. The inversion of waveform semblance data shows that a P-to-P reflector is retrieved at a depth of approximately 2 km. This interface is deeper in the north-eastern part of the profile, where it reaches 3 km depth and can be associated with a limestone horizon.
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