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1、中国南北带震源机制解的聚类分析摘要震源机制解是地震学和地球动力学研究的基础资料，随着地震观测台网的加密，震源机制解资料非常丰富，对于大量震源机制解的科学分类是至关重要的。故为讨论南北地震带震源机制解的分类情况，并探讨该区域应力场环境，本论文根据震源参数利用系统聚类法来对南北带地区震级5.0以上的374个震源机制解进行分类，分类方法分别采用最短距离法和最长距离法，分别分三类和四类进行分类，得出不同类型地震的分布结果，结果显示中国南北地震带北段以逆断层型地震为主，但也伴有部分走滑型地震，中段主要为正断层型，南段则以走滑为主，纵观整个南北地震带，走滑型地震贯穿整个南北，是主要地震类型。关键词:南北地
2、震带;震源机制解;聚类分析ClusteranalysisthefocalmechanismsolutionsofChinesenorth-southseismicbeltAbstract：Focalmechanismsolutionisbiographyseismologyandgeodynamics,seismicobservationnetworkwithencryption,focalmechanismsolutiondataisveryrich,alargenumberoffocalmechanismsolutionsforscientificclassificationisessen
3、tial.Therefore,todiscusstheclassificationSouthSeismicBeltfocalmechanismsolutions,andexploretheregionalstressfieldoftheenvironment,accordingtothisthesis,thesourceparametersusingthesystemclusteringmethodtothenorthandsouthoftheregionwithamagnitudeof5.0ormore374focalmechanismclassification,classificatio
4、nsolutionswererespectivelyshortestdistancemethodandthelongestdistancemethod,pointsIIIandIV,respectively,thedistributionoftheresultsobtainedindifferenttypesofearthquakes,showedChinaSouthseismicbeltinthenorthernsectionofthemainthrustfaultearthquakes,butalsotogowithsectionslipearthquakes,normalfaulttyp
5、epredominantlymiddle,thesouthernsectionofthemainplacesslip,lookattheentirenorth-southseismicbelt,strike-slipearthquakesthroughoutthenorthandsouth,arethemaintypesofearthquakes.Keywords:North-SouthBelt;Focalmechanismsolutions;Clusteranalysis目录1引言........................................................
6、.............................................................................................................12南北地震带及其地质构造..............................................................................................................................22.1贺兰山-六盘山地震带地质构造..................................
7、.......................................................................22.2天水-武都-文县-川西北地震带...........................................................................................................32.
