M-10 RECONSTRUCTION OF HIGH-RESOLUTION VELOCITY MODELS USING JOINT TOMOGRAPHY OF CROSSWELL AND VSP DATA Z. ZHANG 1 J. JACKSON 1 and J. ZHANG 2 ABSTRACT Seismic tomography images can provide useful information about complicated geological structures. These images can be used directly in the interpretation or as the input to migration processing. The resolution of tomography greatly depends upon ray coverage and frequency bandwidth. Crosswell seismic data because of their higher bandwidth can be used to provide high-resolution velocity images. Ideal ray coverage is achieved only if ray paths illuminate the target zone evenly from all angles. In reality however


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