断层气方法对日喀则地区活断层探测及活动性初步判定

摘要

Detection of the radon concentration in fault gas is the method commonly employed in the study of active faults,but this method has been seldom applied in plateau areas.In the detec-tion and evaluation of the active faults in Shigatse City,Tibet,we determined the fault-gas ra-don anomaly characteristics by comparing the fault gas detection results with those from shallow artificial seismic detection.Our analysis results show the detection of radon gas to be an effective method for determining the location of buried faults in a plateau area,and that the fault activity could be preliminarily determined based on abnormal changes in the radon concentration in addi-tion to other exploration methods.%断层气氡浓度探测是活动断层研究中的一种常用手段,但该方法在高原地区很少应用.在西藏日喀则市活动断层探测评价项目中,通过开展断层气探测,与浅层人工地震探测结果进行对比分析,揭示了本地区的断层氡气异常特征.研究表明,断层氡气测量是高原地区确定隐伏断层空间位置的有效方法,根据氡气浓度异常变化,结合其它探测手段,可对断层活动性进行初步判定.