A seismic line is shot over a relatively flat area in North-East India that has a thrust fault in the subsurface. The quality of the seismic data does not allow adequate imaging of the thrust. Also, the surface expression of the thrust is too subtle to be used as a key for interpretation. To aid the interpretation, first arrival times have been inverted using a well-established regularized inversion algorithm and a shallow (~1.5 km deep) velocity-depth model has been developed. The thrust has been interpreted on the velocity-depth model based on the variations of the velocity contours. This interpretation can be converted in time and used to interpret deeper parts of the thrust in the seismic data.


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