土壤气汞探测在夏垫断裂带的应用研究

The Application of Soil-Gas Mercury Detection to the Xiadian Fault Zone

夏垫断裂带是首都圈重要的地震断裂带之一,本文运用构造地球化学对该断裂带进行研究。采用土壤中气态汞测量法在断裂带上的齐心庄和东柳河屯两个剖面进行了细致的野外现场勘测,绘制出研究区土壤气汞分布曲线图和汞含量分布立体图,对研究区断裂带空间位置及走向进行了分析,获得齐心庄和东柳河屯剖面的异常阈值分别为0.23和0.27,阈值显示的异常位置指示了断层面的位置,推测认为断裂带总体走向为45°,断裂带的规模并不大,断裂带上齐心庄剖面的活动性要强于东柳河屯,应为今后地震监测的重点。

The Xiadian fault zone is one of the most significant seismogenic structures in the Capital Circle of Beijing. This paper presents a detailed field survey in the Qixinzhuang and Dongliuhetun sections using the gaseous mercury measurement in soil. The mercury concentration curves and mercury color cubic figures were drawn, which permits to infer the spatial position and strike of the Xiadian fault zone. The threshold values of anomalies on the Qixinzhuang and Dongliuhetun profiles are 0.23 and 0.27, respectively, which indicate the location of the fault plane. Consequently, we consider the overall strike of the Xiadian fault zone is 45°, and has a small scale. On the other hand the data suggests that the Qixinzhuang section is likely more active than the Dongliuhetun section, and the latter should be the focus of seismic monitoring in the future.