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

摘要： 在海河隐伏断裂的探测中,利用FD-3017RaA测氡仪和XG-4型测汞仪开展了土壤气氡和土壤气汞的测量工作。根据12条断层气测线的测量结果,结合人工地震探测资料,对断层气异常位置与断层位置的关系进行了分析;运用断层气异常强度与断层活动性的关系对海河断裂的活动性进行了研究,给出了海河断裂天津段的位置和活动性分段。研究结果表明,断层气方法不仅能给出断层的初步位置,而且能够用于断层的活动性初步分段,但断层气方法所给出的断层位置应是一个条带。经与人工地震探测结果对比分析,断裂位于这个条带内;根据土壤气氡测量结果,可将海河断裂分为东、西两段,且东段的活动性要强于西段。这种强、弱之分仅是一种相对结果,在判定断层是否为活断层方面还存在一定困难。

关键词: 土壤气氡, 土壤气汞, 活断层, 探测