Geological structure for disaster prevention investigation employing seismic tomography
The tomographic inversion of the explosion survey is avail for the geological structure analyses for the fault survey and geometry shape of the base of sediment. Anexample for the egineering gological sructure ivestigation was show in this paper, the detailed P-wave velocity structure of the surface layers off the sea area was analyzed using the 3-D tomographic method for seismic refraction survey. The greater than one thousand P wave arrival times received from 14 seismic explosion surveys were used in the structure analysis of the 2-D profile. In the present analysis, the pseudo-bending method, a fast algorithm for two point ray tracing is used in forward modeling. The method can find an accurate ray path in a full three-dimensional velocity structure even where lateral variations in velocity are severe. The conjugate gradient (CG) algorithm was employed to solve the discrete linearized equation about the traveltime differences. The velocity structure result in the present analysis indicates that the velocity structure obtained from the tomographic technique of the seismic wave velocity emerges evidently lateral heterogeneity. It also implies that the tomographic technique of the seismic explosion survey can character the complicated geological structure. The results may be avail for disaster prevention.
Zhixin Zhao Jiren Xu
Institute of Geology,Chinese Academy of Geological Science,Beijing 100003, China
国际会议
成都
英文
69-71
2010-06-14（万方平台首次上网日期，不代表论文的发表时间）