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| | Abstract | | Seismic reflection method is one of the powerful geophysical exploration methods. An elastic wave propagating from a seismic source reflects at underground incidence points, and the reflected waves observed at receivers include information of underground structures. An elastic wave passes in the spatial zone depending on its wavelength, which is called Fresnel volume. Better migration technique, moving diffracted waves to true reflecting positions, is required to grasp detailed underground structures. In this study, we evaluated S/N ratio, focusing, and processing time of the Fresnel-volume migration. We confirmed that these factors depend on the migration aperture defined by the Fresnel volume. In particular, the migration processing using first Fresnel-volume aperture improves S/N ratio. The processing using the large Fresnel-volume migration can image the reflection structure with narrow focus. Also, the processing time of Fresnel-volume migration is shorter than that of Kirchhoff migration. |
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