关键词: 土壤气氡, 土壤气汞, 活断层, 探测

Abstract: In the exploration of the Haihe hidden fault,radon and mercury in soil gas were measured by using FG-3017 radon detector and XG-4 mercury analyzer.In this paper,based on the measurement results of 12 fault gas profiles,and integrating with the exploration results of artificial earthquake method,the relationship between anomalous site of fault gas and fault location is analyzed.Using the relationship between anomalous strength of fault gas and fault activity,the activity of Haihe Fault is studied,thus the location and activity segmentation of the Haihe Fault in Tianjin region are presented.This study shows that the method of fault gas detection can not only identify the preliminary location of fault,but also make preliminary segmentation of fault activity.The fault detected by the method of fault gas is shown as a band.Through contrasting with exploration results of artificial earthquake method and analyzing,the fault locates inside the band.According to the measurement result of soil gas radon,the Haihe Fault can be divided into east and west segments.At the same time,the activity of the east segment of Haihe Fault is stronger than that of the west segment.This is only a relative result,and it is difficult to judge whether the fault is active or not with this result.

Key words: soil gas radon, soil gas mercury, active fault, exploration