A complex geology of the thrust belt and acquisition related noise limit the ability of conventional processing to yield a reliable velocity model which in turn leads to a poor subsurface image. We demonstrate the utility of 2-D traveltime and 2-D waveform inversion as supplements to conventional imaging and interpretation processes in geologically complex areas such as the thrust belt. First, a smooth velocity model with long wavelength characteristics of the subsurface is estimated through first arrival traveltime inversion. Next, the velocity model is used for depth-migration. The migrated image allows unambiguous interpretation of the thrust fault. Interpretation of the thrust fault in parts of the migrated image that are not adequately resolved due to pre-processing constrains, is achieved on high-resolution velocity model from waveform inversion developed using results from traveltime inversion.
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