基于《中国震例》的地下流体异常特征统计分析  

Statistical Characteristics of Subsurface Fluid Precursors Based on Earthquake Cases in China

作　　者：孙小龙[1,2] 王俊[3] 向阳[4] 王熠熙[5] 

机构地区：[1]中国地震局地壳应力研究所(地壳动力学重点实验室),北京100085 [2]中国地质大学(北京),北京100083 [3]安徽省地震局,安徽合肥230031 [4]新疆维吾尔自治区地震局,新疆乌鲁木齐830002 [5]天津市地震局,天津300201

出　　处：《地震》2016年第4期120-130,共11页Earthquake

基　　金：地震行业科研专项经费项目(201408019-03);中国地震局震情跟踪定向工作任务(2015020301)

摘　　要：基于《中国震例》记录的1966年以来的震例,按异常测项和变化类型分类统计了与地下流体相关的异常数量与震级、震中距、持续时间的相关性。结果显示:中国大陆M6.5以下地震的地下流体异常数量与震级无相关性,M6.5以上地震异常数量随震级的增大而增多,二者呈指数关系;地下流体异常多集中于距震中300km范围内,且各测项间无明显区别,异常数量与震中距之间呈Gamma分布特征;地下流体异常时空演化主要表现为"向震中收缩"、"构造控制"和"相对集中"三种典型特征,震前异常数量主要表现为"持续增长"型和"先增后减"型两类,且以"先增后减"型居多。本文统计得到的地下流体前兆信息特征,可为今后地震预报实践提供一定参考。Based on the records of the earthquake cases since 1966 in Earthquake Cases in China,according to the anomaly items and change types,we get the statistical correlation associated with subsurface fluid abnormities between the quantity and magnitude,epicentral distance and the duration.The results show that,in China's Mainland,the numbers of abnormal underground fluid events before earthquakes of M〈6.5has no correlation with the magnitude,and the number increases with magnitude if M〉6.5,and they grow exponentially;Subsurface fluid abnormities are more concentrated in the range of 300 km from the epicenter,and no significant difference between each measurement,and abnormities number assumes the Gamma distribution characteristics with epicentral distance.The space-time features of subsurface fluid abnormities are mainly in three typical types,‘shrink to the epicenter＇,‘tectonic control＇and ‘concentricity＇.Abnormly amount consists of two typical types before the earthquake,‘sustained growth＇and ‘decrease after increase first＇,and the latter had more.The statistical characteristics of underground fluid precursor information in this paper can provide references for the future practice of earthquake prediction.

关 键 词：地下流体异常 中国震例 特征统计 

分 类 号：P315.7[天文地球—地震学]