Seismic Tomography

Seismic tomography profiles the subsurface by determining the path and velocity of compressional or shear waves. The waves are created by shot, hammer, weight drop, or some comparable method to put energy into the ground. Unlike traditional refraction, more shot locations are conducted and collected data are processed analyzed using SeisOpt Pro (Optim, 2008). SeisOpt Pro uses first arrival picks and elevation data to produce subsurface velocity models through a nonlinear optimization technique called adaptive simulated annealing. The resulting velocity model provides a tomography image of the estimated geologic conditions. Both vertical and lateral velocity information is contained in the tomography model. Changes in layer velocity are revealed as gradients rather than discrete contacts, which typically are more representative of actual conditions.