安宁河—则木河断裂带近期7次地震的震源机制解  

Focal mechanism solutions of recent seven earthquakes on An'ninghe-Zemuhe faults

作　　者：龙思胜[1] 陈银[1] 

机构地区：[1]四川省地震局,四川成都610041

出　　处：《四川地震》2003年第2期21-25,共5页Earthquake Research in Sichuan

基　　金：十五"国家科技攻关项目(01-02-01)子课题资助

摘　　要：在2000 01 02～2002 08 31的时段内,安宁河—则木河断裂带及附近地区发生了7次4级左右小震,其震源机制解揭示的构造应力场和破裂面位错方向显示,是冕宁、越西经布拖、普格到巧家的一次浅层地层失稳滑动造成的。安宁河—则木河断裂和凉山断裂是这次地震活动的发震断裂。用P波初动符号和吴尔夫网下半平面投影方法给出这7次事件的震源机制解。Seven earthquakes with magnitude about 4 occurred on AnningheZemuhe faults and in the near region from 2 January 2000 to 31 August 2002.The tectonic stress field and dislocation direction of the fracture surface of the focal mechanism solutions present a shallow strata slipping,where the seismic fault names are Miangning,Yuexi,Butuo,Puge,Qiaojia.AnningheZemuhe and Lianshan faults are the earthquakeoccurring faults.The Wolf projection method on lower plane with Pwave first motion symbols is used for seven focal mechanism solutions.

关 键 词：安宁河--则木河断裂 震源机制解 震源应力场 

分 类 号：P315.3[天文地球—地震学]