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Solid Earth An interactive open-access journal of the European Geosciences Union
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Volume 2, issue 1
Solid Earth, 2, 1-7, 2011
https://doi.org/10.5194/se-2-1-2011
© Author(s) 2011. This work is distributed under
the Creative Commons Attribution 3.0 License.
Solid Earth, 2, 1-7, 2011
https://doi.org/10.5194/se-2-1-2011
© Author(s) 2011. This work is distributed under
the Creative Commons Attribution 3.0 License.

Method article 03 Jan 2011

Method article | 03 Jan 2011

Some improvements in subbasalt imaging using pre-stack depth migration

I. Flecha1, R. Carbonell1, R. W. Hobbs2, and H. Zeyen3 I. Flecha et al.
  • 1Departament de Geofísica i Tectònica, Institut de Ciències de la Terra "Jaume Almera"-CSIC, C/ Lluis Solé i Sabaris s/n, 08028 Barcelona, Spain
  • 2Department of Earth Sciences, University of Durham, Durham DH1 3LE, UK
  • 3Departement des Sciences de la Terre, Universite de Paris-Sud, Bat. 503, 91405 Orsay Cedex, France

Abstract. Subbasalt imaging can be improved by carefully applying pre-stack depth migration. Pre-stack depth migration requires a detailed velocity model and an accurate traveltime calculation. Ray tracing methods are fast but, often fail in calculating traveltimes in complex models, specially, when they feature high velocity contrasts. Finitte difference solutions of the eikonal are more stable and can produce a traveltime field for the whole model avoiding shadow zones. A synthetic test was carried out to check the performance of a new pre-stack depth migration algorithm in a model that features a high velocity layer surrounded by lower velocities. The results reasonably reproduce the original model. The same scheme was used to process long-offset reflection data from the Faroe Shelf where conventional techniques (stack) were insufficient to assess the structure under a basalt layer. Pre-stack depth migration produced an improved image which recovered the main features in the stacked section and allowed to identify some subbasalt coherent events.

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