松原M_(S)5.1地震前断层土壤气H_(2)、Hg地球化学特征与热红外异常响应研究  

Geochemical characteristics of H_(2) and Hg in soil gas and thermal infrared anomaly response before the Songyuan M_(S)5.1 earthquake

作　　者：李继业 胡澜缤 李营[2] 马龙辰 王强 张思萌 李冬妮 LI Jiye;HU Lanbin;LI Ying;MA Longchen;WANG Qiang;ZHANG Simeng;LI Dongni(Heilongjiang Earthquake Agency,Harbin 150090,Heilongjiang,China;Key Laboratory of Earthquake Prediction of CEA,Institute of Earthquake Forecasting,CEA,Beijing 100036,China;Harbin Technical Center of Earthquake Prevention and Disaster Reduction,Harbin 150021,Heilongjiang,China)

机构地区：[1]黑龙江省地震局,黑龙江哈尔滨150090 [2]中国地震局地震预测研究所,中国地震局地震预测重点实验室,中国北京100036 [3]哈尔滨市应急救援保障中心,黑龙江哈尔滨150021

出　　处：《地震工程学报》2023年第4期933-945,共13页China Earthquake Engineering Journal

基　　金：中国地震局星火计划项目(XH19011);地震预测开放基金项目(XH22035D)。

摘　　要：利用多种气体开展联合观测是捕捉地震前兆异常的有效途径。氢、汞观测作为地震短临预测主要手段和前兆指标,在揭示地下(断裂带)流体与地震孕育、发生关系中发挥着重要的作用。通过在黑龙江肇东观测井开展断裂带土壤气H_(2)、Hg野外定点联合观测试验,对2019年5月18日吉林松原宁江M_(S)5.1主震及其余震序列的震兆关系进行对比分析,结果表明:(1)断裂带土壤气H_(2)、Hg浓度在宁江M_(S)5.1地震前分别存在3个月的短期异常和3天的临震异常,二者在主震前后表现形式以及频谱特征均存在较大差异,这可能与氢、汞特性和孕震机理有关;(2)断裂带土壤气H_(2)、Hg浓度在宁江M_(S)5.1主震及余震时段均存在高值异常,主要表现为“高值异常—恢复正常—发生主震—震后高值异常—恢复正常—发生较强余震”,具有持续性、可重复性和配套性的特点;(3)吉林松原宁江M_(S)5.1地震前后肇东断裂带土壤气H_(2)、Hg地球化学特征与震中区附近热红外异常具有响应特征,主要表现为“土壤气H_(2)峰值异常—震中区热红外高值异常—发生主震—土壤气Hg峰值异常—震中区热红外异常下降—土壤气H_(2)、Hg震后次高值异常—发生强余震”的特点。以上认识,为松辽盆地开展断裂带土壤气地球化学特征与热红外异常响应研究提供参考。Joint observation of various gases is an effective way to capture earthquake precursor anomalies.As the main means of short-term and impending earthquake prediction and precursor indicators,observations of hydrogen and mercury play an important role in revealing the relationship between underground(fault zone)fluid and earthquake preparation and occurrence.Through the fixed-point and joint observation tests of H_(2) and Hg from soil gas in the Zhaodong observation well of Heilongjiang Province,this paper conducts a comparative analysis of the relationship between the precursors and the main shock and aftershock sequences of the M_(S)5.1 earthquake in Ningjiang,Songyuan,Jilin Province,on May 18,2019.Results are presented as follows.(1)Three-month short-term and three-day impending anomalies of H_(2) and Hg concentrations in soil gas occurred before the M_(S)5.1 earthquake,respectively.Considerable differences are observed in their manifestations and spectral characteristics before and after the mainshock,which may be related to the characteristics of hydrogen and mercury and the seismogenic mechanism.(2)High-value anomalies of H_(2) and Hg concentrations in soil gas appeared during the period of M_(S)5.1 mainshock and aftershocks,primarily demonstrating“high value anomaly-returning to normal-occurrence of mainshock-high value anomaly after earthquake-returning to normal-occurrence of strong aftershock”and the characteristics of persistence,repeatability,and matching.(3)The geochemical characteristics of H_(2) and Hg in soil gas from Zhaodong fault zone before and after the M_(S)5.1 earthquake have response characteristics to the thermal infrared anomaly near the epicenter,which is mainly characterized by“abnormal peak value of H_(2)-abnormal high value of thermal infrared in the epicenter-occurrence of mainshock-abnormal peak value of Hg-abnormal decrease of thermal infrared in the epicenter-abnormal secondary high value of H_(2) and Hg-occurrence of strong aftershocks”.The above understanding can provide

关 键 词：地球化学 土壤气体 热红外 松原地震 响应特征 

分 类 号：P315.7[天文地球—地震学] P237[天文地球—固体地球物理学]