地球化学方法控制性探测城市隐伏断层

THE APPLICATION OF GEOCHEMICAL METHOD TO SURVEYING URBAN CONCEALED FAULTS

隐伏断层是城市的潜在威胁,地球化学方法探测隐伏断层是较为成熟的手段,但是城市的环境较为复杂,干扰因素较多,增加了探测难度。通过实验区探测,确定测区土壤中汞气含量异常的判断下限,并采取一系列质量保障措施,增强了异常的可靠性。经浅层地震探测验证,本次化探有效异常点达82%,所推测的断裂分布位置与浅层地震勘探所探测的断点一致性较高。

Concealed faults constitute a latent threat to the city, and the application of geochemical method to surveying concealed faults has already become a relatively mature means. Nevertheless, the urban environment is rather complex, and the disturbance factors are numerous, which increases the detection difficulty. The authors determined the threshold of the anomaly through the surveying work in the experimental area, and raised the anomaly reliability through a series of quality guarantee mechanisms. The effective anomalous spots reach 82% in the geochemical survey, and there exists fairly high consistency between the inferred faults and the broken points detected by shallow seismic prospecting.