基于定点形变资料获取断裂浅层倾向和倾角的方法研究—以唐山台为例

万永魁, 刘峡, 万永革, 李媛, 王雷

万永魁, 刘峡, 万永革, 李媛, 王雷. 2018: 基于定点形变资料获取断裂浅层倾向和倾角的方法研究—以唐山台为例. 地震学报, 40(4): 471-480. DOI: 10.11939/jass.20170160
引用本文: 万永魁, 刘峡, 万永革, 李媛, 王雷. 2018: 基于定点形变资料获取断裂浅层倾向和倾角的方法研究—以唐山台为例. 地震学报, 40(4): 471-480. DOI: 10.11939/jass.20170160
Wan Yongkui, Liu Xia, Wan Yongge, Li Yuan, Wang Lei. 2018: Method for obtaining shallow fault inclination and dip angle based on the fixed-points deformation data:A case study of Tangshan seismic station. Acta Seismologica Sinica, 40(4): 471-480. DOI: 10.11939/jass.20170160
Citation: Wan Yongkui, Liu Xia, Wan Yongge, Li Yuan, Wang Lei. 2018: Method for obtaining shallow fault inclination and dip angle based on the fixed-points deformation data:A case study of Tangshan seismic station. Acta Seismologica Sinica, 40(4): 471-480. DOI: 10.11939/jass.20170160

基于定点形变资料获取断裂浅层倾向和倾角的方法研究—以唐山台为例

基金项目: 国家自然科学基金(41472180)和中国地震局第一监测中心科技创新主任基金(FMC2017012)共同资助
详细信息
    通讯作者:

    刘峡: e-mail: aster551@mail.ustc.edu.cn

  • 中图分类号: P315.2

Method for obtaining shallow fault inclination and dip angle based on the fixed-points deformation data:A case study of Tangshan seismic station

  • 摘要: 本文利用唐山地震台1978—2016年跨断层定点形变资料探究唐山地震台所跨断层的浅层倾向和倾角。首先,对形变资料进行数字滤波处理,消除原始观测数据中的非构造信息;其次,对数据精度进行评价,得出1997—2016年滤波后的形变数据年累计残差普遍较小、精度较高;最后,采用精度较高的形变数据计算SE和NW两倾向不同倾角下基线与水准和的累计残差分布,进而获取断层的浅层倾向和倾角。结果显示,依据跨断层定点形变资料获得唐山地震台所跨断层的浅层倾向为SE,倾角为89°,该结果与前人探槽剖面中断层产状相一致,反映出本文提出的基于长期跨断层定点形变资料通过数字滤波、数据精度评价来获取断裂浅层倾向和倾角的方法具有可行性,但本文所得反演结果与唐山地震台目前采用的断层倾向NW、倾角72°存在一定偏差。
    Abstract: Based on the data of the Tangshan seismic station during 1978−2016, shallow incli-nation and dip angle of the fault which crosses Tangshan seismic station were investigated. Firstly, eliminate non-geologic structure information by digital filtering; secondly, evaluate data precision and obtain that annual accumulated residual error of the filtered data from 1997 to 2016 is generally small and accurate; finally, accumulated residual distribution of baselines and leveling lines are calculated with different dip angles by using these processed data, and the shallow fault inclination and dip angle are obtained. The results show that, according to the cross-fault deformation data of fixed-points, the inclination of shallow fault is SE and dip angle is 89°, which is consistent with the fault attitude in the previous exploration profiles, suggesting that the method proposed in this paper is feasible. However, our inversion result is partly different from the fault inclination NW and dip angle 72° adopted at present by Tangshan seismic station.
  • 图  1   唐山地震台跨断层基线和水准测线布设示意图

    Figure  1.   Schematic diagram for the layout of baselines and leveling lines at Tangshan seismic station

    图  2   唐山地震台1978—2016年跨断层基线、水准测线原始观测数据(黑线)和数字滤波后结果(红线)

    Figure  2.   The original observation data of baseline and leveling line (black lines) across the Tangshan fault during 1978−2016 and its digital filtering results (red lines) of Tangshan seismic station

    图  3   唐山地震台所跨断层不同倾角下基线与水准和的理论变化量与滤波后实际变化量之间的年累计残差

    Figure  3.   Annual residual of baseline and leveling between theory variation and actual variation under different dip angles across the Tangshan fault

    图  4   1978—2016年唐山断裂及唐山菱形地块周缘的地震分布 (a)和M-t图 (b)

    Figure  4.   Earthquake distribution (a) and M-t (b) of the Tangshan fault and the Tangshan diamond block from 1978 to 2016

    图  5   1997—2016年唐山地震台所跨断层不同倾角下基线与水准和的理论变化量与滤波后实际变化量累计残差曲线

    (a)为累计残差结果,(b)为(a)中黑色虚线框部分

    Figure  5.   Distribution of baseline and leveling cumulative residual amount between theory variation and actual variation under different angles across the Tangshan fault from 1997 to 2016

    (a) gives the results of cumulative residual,and (b) shows the part of the dotted rectangle in (a)

    图  6   原唐山市十中北院探槽剖面

    Figure  6.   Trenching profile at northern courtyard of Tangshan Tenth Middle School

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出版历程
  • 收稿日期:  2017-08-04
  • 修回日期:  2017-10-19
  • 网络出版日期:  2018-07-17
  • 发布日期:  2018-06-30

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