安徽地区震源参数的相关性研究  

Study on Source Parameters and Its Similar Relationship of Earthquakes Occurred in Anhui Region

作　　者：郁建芳[1] 谢石文[1] 张炳[1] 隆爱军[1] 韩成成[1] 杨波[1] YU Jianfang;XIE Shiwen;ZHANG Bing;LONG Aijun;AN Chengcheng;YANG Bo(Anhui Earthquake Agency,Hefei 230031,China)

机构地区：[1]安徽省地震局

出　　处：《华南地震》2019年第3期32-41,共10页South China Journal of Seismology

基　　金：安徽省地震科研基金青年项目(20190402)

摘　　要：基于安徽数字地震台网2010年1月至2017年12月记录到的ML2.5~5.0级地震,根据中小地震震源参数测定原理,利用多台多地震联合反演Atkinson方法和Moya方法分别计算了安徽地区地壳平均非弹性衰减因子Q值和安徽24个省属专业地震的台站场地。在此基础上,运用遗传算法求得安徽地区96个地震事件的震源谱参数,进而根据Brune中小地震圆盘模型计算其拐角频率、地震矩、应力降、矩震级、震源尺度等震源参数,并分析其特征及相互之间的关系。研究结果表明:安徽地区中小地震的ML震级与其他震源参数之间存在一定相关关系,而地震矩M0与应力降Δσ、震源尺度r和拐角频率fc之间并未表现出明显的相关关系。Based on the earthquakes with ML2.5-5.0 recorded by Anhui Digital Seismic Network from January 2010 to December 2017,this paper has gotten the average non-elastic attenuation factor Q by using the Atkinson method and the site response of 24 professional seismic stations in Anhui by the Moya method according to the principles of measuring source parameters.On the basis of the above calculation results,the source spectrum parameters of 96 earthquakes events in Anhui region were obtained by the genetic algorithm.Moreover,the source parameters such as corner frequency,seismic moment,stress drop,moment magnitude,and source scale of the above earthquakes were calculated according to the Brune earthquake diskmodel.And the characteristics of these parameters and their relationship with each other were analyzed at the same time.The results show that there is a certain correlation between the MLmagnitude and other source parameters.While there is no obvious correlation between seismic moment M0 and stress dropσ,source scaler,and corner frequency fc.

关 键 词：安徽地区 非弹性衰减因子 台站场地响应 震源参数 相关性 

分 类 号：P315.33[天文地球—地震学]