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Title:: Analysis of Soil Hydrogen Anomaly in the Huoshan Seismic Window Area

作者:: 方震¹; 2; 黄显良¹; 2; 陶月潮¹; 李伸亮³; 陶方宇⁴; 杨源源¹; 朱厚林⁴; 陆栋梁⁴; (1.安徽省地震局,安徽合肥 230031; 2.蒙城地球物理国家野外科学观测研究站,安徽蒙城 233500; 3.合肥地震监测中心站,安徽合肥 230000; 4.金寨地震监测中心站,安徽金寨 237300)

Author(s):: FANG Zhen¹; 2; HUANG Xianliang¹; 2; TAO Yuechao¹; LI Shenliang³; TAO Fangyu⁴; YANG Yuanyuan¹; ZHU Houlin⁴; LU Dongliang⁴; (1.Anhui Earthquake Agency,Hefei 230031,Anhui,China)(2.Mengcheng National Geophysical Observatory,Mengcheng 233500,Anhui,China)(3.Hefei Earthquake Monitoring Central Station,Hefei 230000,Anhui,China)(4.Jinzhai Earthquake Monitoring Central Station,Jinzhai 237300,Anhui,China)

Keywords:: fault hydrogen concentration; hydrogen source; small earthquake activity; the Huoshan Seismic Window area

摘要:: 基于2018年12月4日至2020年8月15日“霍山窗”地区全时段的断裂带土壤气H₂的观测资料,根据测量值的分布范围对资料的可靠性进行了评价,对其气象影响因素也做了分析。结合“霍山窗”地区的小震集中活动,分析了断裂带H₂异常与小震活动性的关系。结果表明:土地岭—落儿岭断裂带H₂浓度前兆异常幅度较大,对观测点所在断裂上的地震活动反应灵敏,映震效果较好。研究区变质岩含有丰富的H₂气源,应力积累加速了断裂带内H₂的释放,张性断裂为H₂的运移提供了良好的通道。

Abstract:: This paper evaluates the reliability of the long-term,high-accuracy soil hydrogen data observed in the Huoshan Seismic Window area according to the distribution of measurements,and analysis of meteorological influencing factors.The relationship between the hydrogen anomaly and the activity of small earthquakes is preliminarily analyzed in the study area.The results show that the hydrogen concentration in the Tudiling-Luoerling fault has a large precursory anomaly extent,and is sensitive to the seismic activity around the observational sites on the fault,suggesting a better earthquake-precursory efficiency.The metamorphic rocks contain H₂-gas sources in the study area.Stress accumulation accelerates the release of H₂ in the fault zone,and tensile faults provide a good channel for H₂ migration.