山西地区地震震源深度特征及构造意义  

The earthquake focal depth characteristics and tectonic significance in Shanxi area

作　　者：梁向军[1,2] 黄金刚[1,2] 李丽[1,2] 刘林飞[1,2] 张蕙[1,2] 

机构地区：[1]山西省地震局,中国太原030021 [2]太原大陆裂谷动力学国家野外科学观测研究站,中国山西030021

出　　处：《地震地磁观测与研究》2015年第3期32-37,共6页Seismological and Geomagnetic Observation and Research

基　　金：地震科技星火计划项目(XH13003Y;XH14010Y);中国地震局青年骨干专项(20140305);2014年震情跟踪专项工作任务(2014010101)共同资助

摘　　要：选取山西数字地震台网地震震源深度资料,采用网格滑动平均法,对2001—2011年2 535个定位精度为Ⅰ类(t≤0.5 s)、Ⅱ类(0.5 s<t≤1.5 s)且ML≥2.0地震的震源深度分布特征进行统计,结果显示,山西地区地震的平均震源深度为0—40 km,中小地震震源深度以6—20 km为主,个别区域有深度20 km以上的地震分布。从剖面图可见,山西地区震源深度分布集中,基本可见大同、忻定、太原和临汾盆地震源深度下界。分析可知,很多深源地震发生在盆地内部,此区域地震活动性高,震源深度范围大,与山西地堑的拉张构造吻合;山西地区地震震源深度由北向南逐渐变深,意味着山西省地堑的形成是从南向北逐渐发展的。Focal depth of 2 535 earthquakes, with focus locating accuraciesⅠ（ t ≤ 0.5 s） and Ⅱ（0.5 st≤1.5 s） and magnitudes（ML） larger than 2.0, recorder from Jan. 2001 to Dec. 2011 are statistically analyzed, based on the local depth data from Shanxi Digital Seismic Network. The average focal depth is calculated by using grid moving average method. It is concluded that focal depth are in range 0—40 km. According to distribution results of different focal depth range 0 —10 km, 11—20 km, 21—30 km and 31—40 km, the focal depth of middle and small earthquakes in Shanxi area are mainly in range of 6—20 km, except earthquakes with focal depths are greater than 20 km in some area;at the same time to draw isoline map, and then discuss the relationship and characteristics of geological structure characteristics of focal depth in Shan area.

关 键 词：山西地区 震源深度 统计分析 构造意义 

分 类 号：P315.2[天文地球—地震学]