摘要
通过对2017年5月土壤气CO_(2),Rn和Hg的野外流动测量以及2020年9月1日至2021年6月30日期间土壤气监测站Rn的连续监测,利用残差法和地震指数KS方法对黄庄—高丽营断裂南北段的活动差异和区域地震活动进行了分析。结果表明,与首都圈地区其它断裂相比,黄庄—高丽营断裂是首都圈地区活动性相对较强的活动断裂,断裂北段的土壤气体浓度和通量较南段更高,且北段上盘的CO_(2)和Rn浓度明显高于下盘,指示断裂北段具有更强的活动性。对土壤气连续监测站数据进行分析,结果显示监测站的Rn浓度与气温、土壤温度和气压之间无明显相关性。2021年3月25日北京顺义ML3.0地震前6天,监测站记录到Rn浓度出现异常升高,增加了一倍,且震后异常持续了一个月。顺义ML3.0地震前后Rn浓度的异常变化表明监测站的土壤气Rn浓度对KS>0.1的地震有很好的响应。
Based on the field flow observation of soil gas(CO_(2),Rn and Hg)in May of 2017 and continuous monitoring of soil gas Rn from September 1,2020 to June 30,2021,the residual signal and seismic index KS are used to study the activity difference between the south and north segments of Huangzhuang-Gaoliying fault and their regional seismicity.The results indicate that this fault is a relatively active fault compared with other faults in the capital circle region of China.The concentrations and fluxes of the soil gases in the north segment of the fault are higher than those in the south segment.And the CO_(2)and Rn concentrations in the hanging wall of the northern segment are significantly higher than those in the footwall.These indicate that the northern segment of the fault has stronger activity.Analyses on the continuous monitoring station data of soil gas Rn show there is no significant correlation between Rn concentration and air temperature,soil temperature,and air pressure.The Rn concentration at the monitoring station,six days prior to the Shunyi ML3.0 earthquake on March 25,2021,was recorded to significantly increase,which doubled and persisted for a month after the earthquake.The anomalous variations of Rn concentration before and after the Shunyi ML3.0 earthquake indicate that the soil gas Rn concentration at the monitoring station exhibits a strong response to earthquakes with KS>0.1.
作者
刘兆飞
何鸿毅
陈志
李营
路畅
邵俊杰
高梓涵
Liu Zhaofei;He Hongyi;Chen Zhi;Li Ying;Lu Chang;Shao Junjie;Gao Zihan(Institute of Earthquake Forecasting,China Earthquake Administration,Beijing 100036,China;Key Laboratory of Earthquake Prediction,China Earthquake Administration,Beijing 100036,China;School of Earth Science and Resources,China University of Geosciences(Beijing),Beijing 100083,China;Institute of Geophysics,China Earthquake Administration,Beijing 100081,China)
出处
《地震学报》
CSCD
北大核心
2023年第4期727-746,共20页
Acta Seismologica Sinica
基金
国家重点研发计划项目(2019YFC1509203)
中国地震局现代化建设试点项目(30222640403)
国家自然科学基金(41402298,42073063,41704060)
中国地震局地震预测研究所基本科研业务费专项(CEAIEF20220504,2021IEF1205,2021IEF0707,2020IEF0704)
高压物理与地震科技联合实验室开放基金(2021IEF0101)联合资助.
关键词
土壤气
地球化学
地震监测
黄庄—高丽营断裂
soil gas
geochemistry
seismicity monitoring
Huangzhuang-Gaoliying fault