唐山地区近十年地震的重定位研究

郭蕾 孙丽娜 周依 王宁

郭蕾,孙丽娜,周依,王宁. 2021. 唐山地区近十年地震的重定位研究. 地震学报,43(6):1−10 doi: 10.11939/jass.20210029
引用本文: 郭蕾,孙丽娜,周依,王宁. 2021. 唐山地区近十年地震的重定位研究. 地震学报,43(6):1−10 doi: 10.11939/jass.20210029
Guo L,Sun L N,Zhou Y,Wang N. 2021. Relocation of earthquakes in Tangshan area in last decade. Acta Seismologica Sinica,43(6):1−10 doi: 10.11939/jass.20210029
Citation: Guo L,Sun L N,Zhou Y,Wang N. 2021. Relocation of earthquakes in Tangshan area in last decade. Acta Seismologica Sinica43(6):1−10 doi: 10.11939/jass.20210029

唐山地区近十年地震的重定位研究

doi: 10.11939/jass.20210029
基金项目: 中国地震局震情跟踪课题(2019010105、2020010114)、中国地震科技星火攻关项目(XH17007)、河北省地震局星火项目(DZ20180319008,DZ20170509039)和河北省地震科技星火重点项目( DZ20170109002)
详细信息
    通讯作者:

    孙丽娜,e-mail:sunlina20082008@126.com

  • 中图分类号: P315.3+1

Relocation of earthquakes in Tangshan area in last decade

  • 摘要: 分别运用双差定位法、结合波形互相关的双差定位法和结合波形互相关的双差层析成像法,对唐山地区2010年1月—2020年7月河北地震台网记录的4 874个地震事件进行重定位研究。结果表明结合波形互相关的双差层析成像法的定位精度高于其它两种方法,地震走时残差均方根由初始的0.71降至0.27。重定位后的震中位置更加集中,线性分布更明显,优势分布方向为NE向,与该区域断层走向基本一致。重定位后震源深度主要集中在5—15 km,分布形态更接近正态分布,结果更加合理。从重定位后的震中空间分布可见在唐山—古冶断裂带东侧有一个NNE向高倾角的小震密集带,近年来小震活动频繁,分析认为该区域的局部应力较高,构造活动较强,推测在唐山—古冶断裂东端点可能存在隐伏断层,该区域地震的发生与其深部活动有关。

     

  • 图  1  研究区断层展布及历史地震分布图

    Figure  1.  Distribution of faults and historical earthquakes in this study

    图  2  研究区内台站、震源及震源深度沿经纬度方向的分布

    Figure  2.  Distribution of seismic stations 、earthquakes and focal depth along latitude and longitude profile in this study

    图  3  重定位前、后唐山地区2010—2020年地震的震中分布图

    (a) 初始地震事件震中分布; (b) 仅震相报告数据的双差定位结果(第一组);(c) 结合波形互相关和震相报告数据的双差定位结果(第二组);(d) 结合波形互相关和震相报告数据双差层析成像结果 (第三组)

    Figure  3.  Distribution of earthquake hypocenters in Tangshan area from 2010 to 2020 before and after relocation

    (a) Initial epicenter distribution;(b) Double-difference relocation results using catalog data (Set 1);(c)Double-difference relocation results combining the waveform cross-correlation and catalog data (Set 2);(d) Double-difference seismic tomography results combining waveform cross-correlation and catalog t data (Set 3)

    图  4  定位深度(上)和定位误差(下)的统计直方图

    (a)仅震相报告数据双差定位结果;(b)结合波形互相关和震相报告数据双差定位结果 ;(c) 结合波形互相关和震相报告数据双差层析成像结果

    Figure  4.  Histogram of focal depth (upper panels) and positioning error (lower panels) after relocation

    (a) Double-difference relocation results using catalog data;(b) Double-difference relocation results combining the waveform cross-correlation and catalog data;(c) Double-difference seismic tomography results combining waveform cross-correlation and catalog data

    图  5  研究区重定位后震中分布图(a)及地震震源沿剖面CC′ (b)、DD′(c)、 EE′ (d)、BB′ (e)和AA′ (f)的分布

    Figure  5.  Distribution of earthquake hypocenters after relocation (a)and cross-section of earthquakes along the profiles CC′ (b)、DD’ (c)、EE′ (d)、BB′ (e)和AA′ (f) of focal depth in this study

    表  1  一维分层速度模型(引自于湘伟等,2003

    Table  1.   One-dimensional velocity model (after Yu et al,2003

    上界面深度/kmP波速度/(km/s)
    05.20
    55.80
    106.00
    156.10
    2−6.60
    256.70
    306.90
    下载: 导出CSV
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出版历程
  • 收稿日期:  2021-02-25
  • 修回日期:  2021-06-04
  • 网络出版日期:  2021-11-01

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