Iterative supervirtual refraction interferometry

Abstract
In refraction tomography, the low signal-to-noise ratio (S/N) can be a major obstacle in picking the first-break arrivals at the far-offset receivers. To increase the S/N, we evaluated iterative supervirtual refraction interferometry (ISVI), which is an extension of the supervirtual refraction interferometry method. In this method, supervirtual traces are computed and then iteratively reused to generate supervirtual traces with a higher S/N. Our empirical results with both synthetic and field data revealed that ISVI can significantly boost up the S/N of far-offset traces. The drawback is that using refraction events from more than one refractor can introduce unacceptable artifacts into the final traveltime versus offset curve. This problem can be avoided by careful windowing of refraction events.

Citation
Al-Hagan, O., Hanafy, S. M., & Schuster, G. T. (2014). Iterative supervirtual refraction interferometry. GEOPHYSICS, 79(3), Q21–Q30. doi:10.1190/geo2013-0210.1

Acknowledgements
We thank the 2011-2012 sponsors of the CSIM Consortium (csim.kaust.edu.sa) for their support. We also thank KSL, King Abdullah University of Science and Technology, for the use of the Shaheen supercomputer.

Publisher
Society of Exploration Geophysicists

Journal
GEOPHYSICS

DOI
10.1190/GEO2013-0210.1

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