唐山及周边地区中小地震重定位及其构造特征  

Middle-small Earthquake Relocation and Tectonic Characteristics of Tangshan and Its Adjacent Area

作　　者：陈佳维[1] 崔效锋[1] 胡幸平[1] 

机构地区：[1]中国地震局地壳应力研究所地壳动力学重点实验室,北京100085

出　　处：《华北地震科学》2017年第1期1-9,共9页North China Earthquake Sciences

基　　金：国家自然科学基金"利用不同地理位置的地震台网记录的内核震相进一步约束地球最内核的结构和物性"(41504071);中央级公益性科研院所基本科研业务专项"基于实测数据的中国及邻区水平最大主应力方向的空间优化计算研究"(ZDJ2015-06)

摘　　要：采用双差定位法对唐山及周边地区2009年1月至2015年10月发生的4 115个中小地震进行了重新定位,改进了初始定位精度,得到了更加准确的3 466个地震事件的震源位置信息,并对比分析了重定位后的地震与活动断裂的关系。结果显示:(1)研究区内地震主要集中在华北平原北部,并且以研究区东部的唐山震源区最为集中,从水平方向来看,小震事件更加集中于断裂带附近,呈现出较好的条带状分布特征,从地震震源深度来看,地震主要集中分布在5~15km深度范围内,且不同地震带区的小震震源深度分布特征存在差异;(2)张渤地震带小震主要发生在中上地壳,而渤海海域地震带的小震发震层为上地壳;(3)张渤地震带的小震震源深度由西向东呈现出逐渐变浅的趋势,且唐山断裂带东侧存在一个NE走向、倾角较陡的小震活动带。In this study, we relocated 4 115 earthquakes occur red dur ing January 2009 to October 2015 in Tanshan and its adjunct area using the double-difference methods, analyzed the relationship between the distribution of earthquakes and the active faults. The results show that the earthquakes mainly concentrate in the northern of the North China plain and most intensively focused on Tangshan seismic region. Earth-quakes epicenters concentrated along faults and presented the characteristics of banding distribution. Most of the depth of earthquake source distributed between 5 and 15 kilometers with the variant depth distribu-tion feature to different seismic belt. The earthquake seismogenic layer is middle-upper crust in Zhangjiak- ou-bohai seismic belt, while it is upper crust in Bohai sea seismic belt. The earthquake source depth of Zhangjiakou-Bohai seismic belt showed the trend of gradually becomes shallow from west to east, and there is a small earthquake activity belt in north east direction and steep dip angle on the east side of Tang-shan fault belt.

关 键 词：小震精定位 波形互相关 双差定位法 张渤地震带 唐山断裂带 

分 类 号：P315.2[天文地球—地震学]