河北及邻区震源机制与构造应力场  

Focal Mechanism and Tectonic Stress Field in Hebei and Its AdjacentArea

作　　者：刘静[1] 董建辉[2] 陈婷[3] 张环曦[1] 张蕾[1] 

机构地区：[1]河北省地震局石家庄中心台,石家庄050021 [2]长江三峡勘测研究院有限公司,武汉430074 [3]河北省地震局,石家庄050021

出　　处：《华北地震科学》2016年第3期42-47,共6页North China Earthquake Sciences

基　　金：河北省地震局青年基金项目(DZ20140709027)

摘　　要：采用CAP方法反演2008年1月至2013年11月河北及邻区M_L3.5以上地震的震源机制,结果显示:震源错动类型以走滑断层类型为主,兼有一定数量的正断层;构造应力场最大主压应力轴方向NEE,与之前的研究结果一致,但呈现出暂时的正断层兼走滑的应力状态,具有继承性和差异性特征,推测可能与中等地震易受局部构造活动影响以及巨大地震改变了区域构造应力作用方式有关。Using the CAP method, we calculated the focal mechanism solutions of the ML≥3.5 earthquake- soecurred from January 2008 to November 2013 in Hebei province and its adjacent area. Most of the focal mechanisms are of strike-slip fault type except for a certain number of normal faults. The maximum principal compressive stress axis of the tectonic stress field is in the NEE direction which is consistent with previous research results, but the tectonic stress field shows a transient normal fault and strike-slip stress state and has the characteristics of inheritance and difference. These characterizes may be related to the aspects that moderate earthquake is easily affected by the regional tectonic activities and the changing of regional tectonic stress field caused by great earthquake.

关 键 词：河北及邻区 CAP方法 震源机制解 应力场 

分 类 号：P315.3[天文地球—地震学]