2D and 3D Tomography for Near-Surface Statics Corrections

P076 2D and 3D Tomography for Near-Surface Statics Corrections J. Zhang* (GeoTomo) & O. Yilmaz (GeoTomo) SUMMARY If the near-surface velocity structures are complex in land seismic conventional refraction methods for statics corrections often fail. the assumption of "layers" is no longer valid. When this happens traveltime tomography often proves effective for solving statics prob tomography approach that we developed inverts the first-arrival tr reconstructs a near-surface velocity model on a grid basis and t assumption for the shallow Earth. After resolving the near-surfac calculate long-wavelength statics using the velocity model and al short-wavelength residual statics from the refraction traveltimes.