Super-virtual interferometric separation and enhancement of back-scattered surface waves

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SEG Technical Program Expanded Abstracts, ISSN: 1949-4645, Vol: 34, Page: 5092-5096

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Guo, Bowen; Hanafy, Sherif; Schuster, Gerard T.
Society of Exploration Geophysicists
Earth and Planetary Sciences; near surface; separation; surface wave; scattering
conference paper description
Back-scattered surface waves can be migrated to detect near-surface reflectors with steep dips. A robust surface-wave migration requires the prior separation of the back-scattered surface-wave events from the data. This separation is often difficult to implement because the back-scattered surface waves are masked by the incident surface waves. We mitigate this problem by using a super-virtual interferometric method to enhance and separate the back-scattered surface waves. The key idea is to calculate the virtual back-scattered surface waves by stacking the resulting virtual correlated and convolved traces associated with the incident and back-scattered waves. Stacking the virtual back-scattered surface waves improves their signal-to-noise ratio and separates the back-scattered surface-waves from the incident field. Both synthetic and field data results validate the robustness of this method.