Abstract：The authors developed a software of 3-D tomographic statics based on 3-D tomographic inversion on the basis of surface-consistent model. The software is suitable for wide line,crooked line，2-D conventional survey and currently widely used 3-D survey. In topographic and complex area,the resolution of evaluation of weatheying depth and velocity is the key of static processing. The paper reconstructed weathering velocity model in 3-D space using the algorithm combining least square with QR decomposition based on first break travel times data observed in 3-D seismic survey and gained the synchronous calculation on long wavelength and short wavelength of statics. Adoption of fractal based algorithm overcame the detecting errors caused by waveform difference of first break and phase turnover of refraction,obtained large-scaled,fully automatic operations of 3-D first break detection in detection of observed first break travel time data. The processing results of field data show that the 3-D tomographic method for static corrections presented in the article is very effective.
