基于HVSR谱比法的北京通州精细沉积界面结构研究  

Research on fine sedimentary interface structure in Tongzhou area based on HVSR spectral ratio method

作　　者：朱冰清 谢俊举[1] 王伟涛[1] 李志伟[3] ZHU BingQing;XIE JunJu;WANG WeiTao;LI ZhiWei(Institute of Geophysics,China Earthquake Administration,Beijing 100081,China;Tianjin Earthquake Agency,Tianjin 300000,China;Beijing Institute of Satellite Environmental Engineering,China Academy of Space Technology,Beijing 100094,China)

机构地区：[1]中国地震局地球物理研究所,北京100081 [2]天津市地震局,天津300000 [3]中国空间技术研究院北京卫星环境工程研究所,北京100094

出　　处：《地球物理学报》2025年第4期1340-1351,共12页Chinese Journal of Geophysics

基　　金：国家重点研发计划课题(2022YFC3003503)资助。

摘　　要：利用北京通州布设的由900余个台站组成的密集台阵,台站间距平均1 km,采用HVSR谱比法获得了该区域的第四纪沉积层界面分布情况.研究结果表明该区域第四纪沉积层厚度在100~800 m,不同区域的厚度具有明显特征,整体变化与区域的二级构造单元一致,大厂凹陷和北京凹陷沉积层厚度较厚,厚度范围500~800 m,研究区域东北部和大兴隆起沉积厚度较薄,厚度不超过200 m.大兴凸起、北京凹陷、大厂凹陷存在深度100 m左右的表层覆盖软土层和较硬的固结沉积层之间波抗阻界面.跨越断层和块体的剖面显示测线经过大兴凸起时第四纪沉积层基底界面具有明显抬升,第四纪沉积覆盖层在夏垫断裂存在明显的错动.HVSR谱比法是成本低、效率高、对环境破坏小的地震学被动源的地下介质探测手段,其研究结果可以为地震危险性评价、灾害风险评估提供有效参考.By using a dense array of over 900 stations set up in Tongzhou,Beijing,with an average distance of 1 km between stations,the distribution of Quaternary sedimentary layer interfaces in the region was obtained using the HVSR spectral ratio method.The research results indicate that the thickness of the Quaternary sedimentary layer in the region ranges from 100 m to 800 m,with distinct characteristics in different areas.The overall variation is consistent with the secondary structural units of the region.The sedimentary layers in the Dachang Depression and Beijing Depression are thicker,with a thickness range of 500 m to 800 m.The sedimentary thickness in the northeastern part of the study area and Daxinglongqi is thinner,with a thickness not exceeding 200 m.The Daxing uplift,Beijing depression,and Dachang depression have wave impedance interfaces with weakly cemented sediments,loose sediments,and strongly cemented sediments at a depth of about 100 meters.The profile crossing faults and blocks shows that when the survey line passes through the Daxing uplift,the basement interface of the Quaternary sedimentary layer has obvious uplift,and the Quaternary sedimentary cover layer has obvious displacement in the Xiadian fault.The HVSR spectral ratio method is a low-cost,efficient,and environmentally friendly passive source detection method for underground media in seismology.Its research results can provide effective references for earthquake hazard assessment and disaster risk assessment.

关 键 词：HVSR谱比法 北京通州 沉积结构 

分 类 号：P315[天文地球—地震学]