京津冀地区地震重新定位及其与活动断裂的关系

发布时间：2018-06-23 04:39

本文选题：双差定位法 + 地震活动　；参考：《地震》2017年03期

【摘要】：地震重新定位为地震活动和活动构造等研究提供了相对精确的地震参数。本文采用双差地震定位法对京津冀及周边地区2007年12月~2016年3月底的地震进行重新定位,并结合区内的活动断裂资料,探讨重定位后地震的空间分布特征、震源深度分布特征及其与已知活动断裂的关系,并根据重定位后地震空间线性条带的走向揭示隐伏断裂。研究结果表明,重定位后,地震主要集中在唐山、邢台、张渤带西段和文安地区,震中在空间上的分布比由常规地震确定的初始震中更为集中,沿断裂走向更加收敛;震源深度分布更加合理,主要集中在1~20km的中上地壳层;定位结果显示唐山断裂、卢龙断裂为北西倾高角断层,新河断裂为北西向低倾角断层,张北震区、延矾盆地和怀涿盆地断裂、黄庄—高丽营断裂、夏垫断裂等地区的地震活动剖面呈近直立分布;另外,根据重定位后地震的线性分布还刻划出唐山断裂北段的南侧、文安北部两条近NNE方向的隐伏断裂。本文的研究结果对京津冀地区的地震活动、断层构造以及地震孕育发生环境具有重要意义。
[Abstract]:Seismic relocation provides relatively accurate seismic parameters for seismic activity and active structures. In this paper, the double difference seismic location method is used to relocate the earthquakes in Beijing, Tianjin, Hebei and its surrounding areas from December 2007 to March 2016. Combined with the active fault data in the area, the spatial distribution characteristics of earthquakes after relocating are discussed. The characteristics of focal depth distribution and its relationship with known active faults are discussed, and the hidden faults are revealed according to the strike of seismic spatial linear belt after relocating. The results show that the earthquake is mainly concentrated in Tangshan, Xingtai, the west section of Zhang-Bo belt and Wenan area after repositioning. The distribution of epicenter in space is more concentrated than the initial epicenter determined by conventional earthquake, and converges more along the fault strike. The distribution of focal depth is more reasonable, mainly in the middle and upper crust of 1~20km, and the localization results show that Tangshan fault, Lulong fault is NW inclined high angle fault, Xinhe fault is NW trending low dip fault, Zhangbei earthquake area, The seismicity profiles of Yanfan basin and Huaizhuo basin, Huangzhuang-Gaoliying fault and summer cushion fault are nearly vertical distribution, in addition, the south side of Tangshan fault is also delineated according to the linear distribution of earthquakes after repositioning. Two concealed faults near NNE direction in northern Wenan. The results of this paper are of great significance to the seismicity, fault structure and seismogenic environment in Beijing-Tianjin-Hebei area.
【作者单位】：中国地震局工程力学研究所地震工程与工程振动重点实验室;中国地震局地壳应力研究所;四川省地震局;
【基金】：北京市自然科学基金(8164065)资助
【分类号】：P315.2

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