陈佳维, 崔效锋, 胡幸平. 唐山及周边地区中小地震重定位及其构造特征[J]. 华北地震科学, 2017, 35(1): 1-9. DOI: 10.3969/j.issn.1003-1375.2017.01.001
引用本文: 陈佳维, 崔效锋, 胡幸平. 唐山及周边地区中小地震重定位及其构造特征[J]. 华北地震科学, 2017, 35(1): 1-9. DOI: 10.3969/j.issn.1003-1375.2017.01.001
CHEN Jia-wei, CUI Xiao-feng, HU Xing-ping. Middle-small Earthquake Relocation and Tectonic Characteristics of Tangshan and Its Adjacent Area[J]. North China Earthquake Sciences, 2017, 35(1): 1-9. DOI: 10.3969/j.issn.1003-1375.2017.01.001
Citation: CHEN Jia-wei, CUI Xiao-feng, HU Xing-ping. Middle-small Earthquake Relocation and Tectonic Characteristics of Tangshan and Its Adjacent Area[J]. North China Earthquake Sciences, 2017, 35(1): 1-9. DOI: 10.3969/j.issn.1003-1375.2017.01.001

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

  • 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5~15 km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。

     

    Abstract: In this study, we relocated 4 115 earthquakes occurred during 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. Earthquakes 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 distribution feature to different seismic belt. The earthquake seismogenic layer is middle-upper crust in Zhangjiakou-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 Tangshan fault belt.

     

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