Refraction Tomography Without Ray Tracing

This paper introduces a new algorithm for refraction tomography that does not require ray tracing. The method inverts different types of refracted waves including head waves and diving waves. First, traveltime/offset functions for each station are estimated from first-arrival picks. Next, these functions are transformed into velocity/depth functions that make up the near-surface model. Then, longperiod statics are calculated using the derived model. Finally, short-period statics are estimated by a surfaceconsistent decomposition of the traveltime residuals.