"Rayfract traveltime tomography software models subsurface refraction, transmission and diffraction of seismic body waves. Obtain a good initial velocity model from raw first breaks in no time with our Delta-t-V turning ray seismic refraction method. This method gives a good initial fit between modeled and picked first breaks, even in case of velocity inversions. Automatically refine the model with our Wavepath Eikonal Traveltime WET tomographic inversion ( Fresnel volume approach). The velocity model is updated until synthetic traveltimes optimally match times as measured and picked. Rayfract supports extreme topography and images real life geological settings such as faults, lateral and vertical velocity gradients, local velocity anomalies, pinching out layers, irregular weathering layers and outcrops. "