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## ABSTRACTTomographic estimation of velocities is usually performed by fitting picked travel-time data to a set of time/distance equations using a slowness function which is not dependent on angle. If the medium is assumed to be transversely isotropic with vertical symmetry axis, an elliptic form can be used to approximate the traveltime-distance relationship. When this relationship is used to fit the data, the result is two images representing the vertical and horizontal components of slowness. The inversion is a simple extension of the well known isotropic schemes and whether it is successful depends on the range of ray angles available. This is illustrated with synthetic and field-data examples. |

- Introduction
- FORWARD MODELING
- INVERSE MODELING
- SYNTHETIC EXAMPLES
- FIELD DATA EXAMPLES
- CONCLUSIONS
- ACKNOWLEDGMENTS
- REFERENCES
- About this document ...

12/18/1997