This Procedure delivers reliable smoothed models even in case of velocity inversions. A smooth initial 1D gradient model is determined automatically directly from the traveltime data, by averaging DELTA-t-V method 1D velocity-depth Profiles along the seismic line. This increases the numerical robustness of the method. Both P-wave and S-wave propagation is modeled with wave paths (also known as Fresnel volumes) instead of conventional seismic rays. Our Smooth inversion tomographic method is based on physically meaningful modeling of seismic first break energy refraction, transmission and diffraction. Our Rayfract seismic refraction tomography software allows reliable imaging of subsurface velocity structure including faults, strong lateral velocity variation and other velocity anomalies.
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