土壤氡方法用于断层活动性研究的讨论

A discussion of fault activity research using the measurement resultsof soil radon

本文系统地分析了海河断裂、天津南断裂、天津北断裂和沧东断裂等的土壤氡测量资料,用M-M珚值的组合以及H值、An值等3种方式对天津地区4条断裂的活动性强弱进行了分析和划分,经与活断层探测中得到的4条断裂的活动性分段结果对比发现,两者具有一定的一致性。同时发现,每种方法都有其局限性,进而认为,选择合适的方法,运用土壤氡测量资料能够对断层的活动性进行初步分析和分区,从而为断层的活动性分段提供参考。通过不同断裂间上述3组指标对比发现,土壤氡测量结果不能用于判断不同断裂间的活动性强弱。从实际工作出发,为利于分析断层的活动性分区,断层气测线在布设时应在探测断层与已知断裂的交汇部位附近适当增加密度。

This paper systematically analyzes the measurement results of soil radon of the Haihe River, Tianjin South, Tianjin North and Cangdong faults, and the activity strength or weakness of the four faults are analyzed and divided in terms of the H value, the association of the M and ~/ values and An value. Through the contrast with the segmentation results of the four faults obtained in the fault exploration, it is found that the two are consistent with each other. At the same time, each method is found to have its limitation. Therefore with the proper selection, soil radon measurements can be a preliminary analysis of fault activity and can serve as a reference for the segmentation of fault activity. The contrast of the targets among the different faults reveals that the measurement results of different faults can not been used for determining the strength or weakness of fault activity among the different faults. In reality, in order to facilitate the analysis of fault activity partition, the measurement line of fault gas should be properly encrypted in intersection vicinity of the detection of the known faults.