江苏及邻区地震烈度衰减关系  

Study on seismic intensity attenuation law in Jiangsu and its adjacent areas

作　　者：何奕成 徐年[1] 吴珍云[1] 郑黄海 王琛[1] He Yicheng;XU Nian;WU Zhenyun;ZHENG Huanghai;WANG Chen(Jiangsu Earthquake Agency, Nanjing 210014, China)

机构地区：[1]江苏省地震局,中国南京210014

出　　处：《地震地磁观测与研究》2018年第1期60-66,共7页Seismological and Geomagnetic Observation and Research

基　　金：江苏省地震局青年科学基金(项目编号:201606);江苏省自然科学基金(项目编号:BK20131454)

摘　　要：地震烈度衰减关系由于受震源性质、传播介质特性以及近地表场地条件的影响,存在较强的区域性差异。收集1937—2015年发生在江苏及邻区的59个地震数据,利用长轴可转向方法得到120条等震线长短轴半径,采用椭圆烈度衰减模型,用多元稳健回归方法将等震线数据进行拟合,统计得到本地区地震烈度衰减关系,并与汪素云等的研究及实际地震等震线数据进行比较,结果表明,本文结果与实际资料拟合程度较好,且在地震震级M_S<6.0及震中距小于300 km时具有较强的可靠性。Since the difference of focal character,media and site,seismic intensity law is different in regions.In this paper,collecting120isoseismal lines from59earthquakes which occurred during the year of1937to2015in Jiangsu and its adjacent areas,and measuring the major and minor axis radius of isoseismal line,the seismic intensity attenuation law in study areas is obtained by using ellipse intensity attenuation model and the multiple stable regression method.The result is compared with that given by Wang Suyun and also checked with the real isoseismal lines from earthquakes which have occurred in the past few years.The result shows that the obtained seismic intensity attenuation law is well fitted with the real isoseismal lines and it has strong reliability in the range of MS less than6.0and the epicentral distance less than300km.The result not only improves the earthquake disaster assessment and assistant decision system in Jiangsu Province but also has wide significance in seismic risk analysis and other areas.

关 键 词：江苏及邻区 地震烈度 衰减关系 多元稳健回归 

分 类 号：P315[天文地球—地震学]