甘肃平凉地区地震活动特征及其发震机理研究  

Study on Seismicity Characteristics and Mechanism in Pingliang Area,Gansu Province

作　　者：赵凌云[1] 张辉[1] 刘小凤[1] 

机构地区：[1]中国地震局兰州地震研究所,甘肃兰州730000

出　　处：《西北地震学报》2009年第2期186-190,共5页Northwestern Seismological Journal

基　　金："十一五"国家科技支撑计划子专题(2006BAC01B03-04-02);地震科学联合基金青年基金C08071

摘　　要：针对2001年以来甘肃省平凉地区中小地震活动增强现象比较突出问题,通过遗传算法重新定位地震深度,利用矩张量反演方法反演震源机制解,并根据平凉地区地震时空分布特征、震相特征以及区域地质构造环境,认为平凉地区地震主要为煤矿诱发地震,可能发震机理为煤体压缩、顶底板拉伸、断层矿震等。Since 2001, small -moderate seismicity has been increasing obviously in Pingliang area, Gansu province. In this paper, the focal depths are definited by the locating method based on genetic algorithm, the focal mechanism is calculated by the moment tensor inversion. According to seismic spatio-temporal distribution, seismic phase and regional geological structural environment, it is considered that the earthquakes in Pingliang area are mainly mining-induced earthquakes, and the kinds of initial mechanism are coal body compression, work face stretching and fault rockburst.

关 键 词：平凉地区 遗传算法定位 矩张量反演 震源机制解 矿震 

分 类 号：P315.1[天文地球—地震学]