Application of P-S method in the shallow fine structure detection in North China Plain

In view of the situation that urban planning requires more and more precision of urban underground space detection, a pilot study of shallow P-S wave exploration was carried out near the Xiong'an New Area in North China Plain.The parameters of field data acquisition, data processing flow, key techniques and test results are described in detail from the aspect of method and technology.The study has resulted in fine geological structure and velocity distribution of the shallow layer in the test area, and P -wave and S-wave section have good contrast in the depth domain.In the study area, the detective depth of P-wave method is about 700 m, and the lowest detective depth is 24 m, the overall resolution is 4 m; the S- wave detective depth is about 220 m, the shallowest detective depth is 9 m, and the overall resolution is about 1 m.The S-wave makes up for the deficiency of the blind area and insufficient resolution of P-wave in the shallow layer, which improves the accuracy of the shallow structure division and fault location.The P-wave makes up for the defect of shallow detecting depth of S-wave.