Woodward, D.J. 1991 Inversion of seismic refraction data. Wellington: DSIR Geology & Geophysics. Technical report / Geophysics Division 114. 23 p.
Abstract
A computer program has been developed that inverts seismic refraction data to obtain shallow geological structure and static corrections for seismic reflection surveys. The geology is modelled as a series of distinct layers. Within each layer the velocity varies linearly between pre-specified points along the profile and is constant with depth. The boundaries between the layers are defined by polylines which have their vertices at fixed distances along the seismic line but at depths determined by a least squares analysis. The inversion minimises the differences of computed travel times from those measured, either on specific seismic refraction surveys or on seismic reflection surveys. The minimisation is obtained by varying the velocities of the layers and the depth to the vertices on the interfaces between the layers. It is done laterally, solving for all the variables at once rather than the more common approach of solving successively for each layer. The structure of the computer program which implements the technique is included in Appendix 1 (auth)
