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First-Arrival Tomography for Near-Surface Model Building
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 63rd EAGE Conference & Exhibition, Jun 2001, cp-15-00144
Abstract
A-36 FIRST-ARRIVAL TOMOGRAPHY FOR NEAR- SURFACE MODEL BUILDING Summary 1 A new method has been developed for tomographic determination of the near-surface velocity structure from first arrivals. It treats the first arrivals as direct body waves propagating along turning rays and represents the velocity structure with a grid model. Estimation of the grid’s node velocities is formulated as an iterative regularized linear least-squares problem. The traveltimes and raypaths required for the inversion are calculated by a highly efficient grid raytracing technique. Experiments with both synthetic and real data show that the new tomographic method is accurate and capable of recovering