夏垫活动断层土壤氡地球化学特征

Geochemical Characteristics of Soil Radon in the Xiadian Active Fault

夏垫活动断层为首都圈重要的断层之一。本文用土壤中气氡测量法在齐心庄和东柳河屯区段进行了野外现场勘测,揭示了研究区土壤氡的地球化学异常,绘制出研究区的氡浓度等值线图,分析了该区段活动断层的上下盘、空间位置及断层走向,并探讨了研究区断裂带的规模及活动性。综合分析认为,断裂带规模较大和断层活动性较强的齐心庄处的夏垫活动断层应为今后地震监测的重点。

The Xiadian active fault is one of the most important seismogenic faults in the capital area of China. Based on the detailed field survey on site in Qixinzhuang section and Dongliuhetun section we measured gaseous radon concentration in soil to reveal the soil radon geochemical anomaly in study area, and produced the radon concentration contour map. We analyzed the hanging wall and footwall, spatial position and strike of active fault, and discussed the scale and activity of fault zone in study area. After the comprehensive analysis, we concluded that Qixinzhuang segment of Xiadian fault should be paid more attention in the future because it has relatively high faulting activity in terms of soil radon concentration.