2017年伊朗MW7.3地震的震后余滑分布及其对2018年MW6.0地震的触发影响

蒋子琴 杨莹辉 陈强 徐倩 徐浪 黄小梅

蒋子琴,杨莹辉,陈强,徐倩,徐浪,黄小梅. 2022. 2017年伊朗MW7.3地震的震后余滑分布及其对2018年MW6.0地震的触发影响. 地震学报,44(3):452−466 doi: 10.11939/jass.20200140
引用本文: 蒋子琴,杨莹辉,陈强,徐倩,徐浪,黄小梅. 2022. 2017年伊朗MW7.3地震的震后余滑分布及其对2018年MW6.0地震的触发影响. 地震学报,44(3):452−466 doi: 10.11939/jass.20200140
Jiang Z Q,Yang Y H,Chen Q,Xu Q,Xu L,Huang X M. 2022. Afterslip distribution of 2017 Iran MW7.3 earthquake and its triggering effects on the 2018 MW6.0 earthquake. Acta Seismologica Sinica,44(3):452−466 doi: 10.11939/jass.20200140
Citation: Jiang Z Q,Yang Y H,Chen Q,Xu Q,Xu L,Huang X M. 2022. Afterslip distribution of 2017 Iran MW7.3 earthquake and its triggering effects on the 2018 MW6.0 earthquake. Acta Seismologica Sinica44(3):452−466 doi: 10.11939/jass.20200140

2017年伊朗MW7.3地震的震后余滑分布及其对2018年MW6.0地震的触发影响

doi: 10.11939/jass.20200140
详细信息
    通讯作者:

    蒋子琴,在读硕士研究生,主要从事InSAR技术在地震灾害中的应用研究,e-mail:jzqswjtu@163.com

  • 中图分类号: P315.72+5;P315.72+7

Afterslip distribution of 2017 Iran MW7.3 earthquake and its triggering effects on the 2018 MW6.0 earthquake

  • 摘要: 收集了覆盖监测区域的Sentinel-1卫星雷达影像,利用短基线集干涉测量技术提取了2017年伊朗萨波尔扎哈布MW7.3地震后283天的地表时序形变,通过二步法反演得到其震后余滑分布,之后采用差分干涉技术获取了2018年发生于同一地区的贾万鲁德MW6.0地震的同震形变场,并将反演所得的发震断层参数作为应力计算的接收断层参数,来分析2017年MW7.3强震及其震后活动对2018年贾万鲁德MW6.0地震的触发影响。结果表明:萨波尔扎哈布地震的震后形变主要由孕震断层面的余滑运动所致,震后283天余滑模型的累积滑移量达到0.7 m;2018年贾万鲁德地震的发震断层走向为355.6°,倾角为89.4°,同震断层破裂以右旋走滑为主,兼具部分正断层运动。本文所得的贾万鲁德地震断层平面上的库仑应力变化表明,2017年MW7.3主震及其震后余滑对2018年MW6.0地震的发生具有一定的触发效应,MW6.0地震的发生可能与区域板块的活动性相关。

     

  • 图  1  2017 年和 2018 年两次伊朗地震震源区的构造背景及余震分布

    Figure  1.  Tectonic settings of the source regions of the two Iran earthquakes in 2017 and 2018 and aftershock distribution

    图  2  2017年萨波尔扎哈布MW7.3地震的震后形变场

    (a) 升轨视线向形变量;(b) 降轨视线向形变量

    Figure  2.  Post-seismic deformation field of the Sarpol Zahab MW7.3 earthquake in 2017

    (a) Ascending LOS deformation;(b) Descending LOS deformation

    图  3  点形变序列(a)及震后余滑的地震矩张量M0和矩震级MW随时间的变化(b)

    Figure  3.  Point deformation sequences (a) and variation of the seismic moment tensor M0 and the moment magnitude MW of the afterslip with post-seismic time (b)

    图  4  2017年萨波尔扎哈布MW7.3地震的震后余滑分布

    Figure  4.  The afterslip distribution of Sarpol Zahab MW7.3 earthquake in 2017

    图  5  2017年萨波尔扎哈布MW7.3地震震后余滑的模拟形变场和残差。(b) 降轨形变场

    Figure  5.  The simulated post-seismic deformation fields and the residuals based on the afterslip of the Sarpol Zahab MW7.3 earthquake in 2017。(b) The descending deformation field

    图  6  2018年贾万鲁德MW6.0地震升轨(上)、降轨(下)的同震形变场及其模拟残差

    (a) 观测形变场;(b) 模拟形变场;(c) 残差

    Figure  6.  Coseismic deformation fields and simulation residuals in ascending (upper) and descending (lower) orbits of the Javanrud MW6.0 earthquake in 2018

    (a) Observed InSAR deformation field;(b) Simulated deformation field;(c) Residual

    图  7  InSAR反演所得的贾万鲁德MW6.0地震的断层滑动模型

    (a) 断层滑动空间分布;(b) 断层平面上的滑动分布,黄色星形代表2018年贾万鲁德MW6.0地震震源在断层面上的投影位置

    Figure  7.  Fault slip model of the Javanrud MW6.0 earthquake constrained by InSAR observations

    (a) 3D view of the fault slip;(b) Slip distribution on the fault plane,where the yellow star represents the projected location of the hypocenter of the 2018 MW6.0 Javanrud earthquake

    图  8  2017年萨波尔扎哈布MW7.3地震及其震后余滑在2018年贾万鲁德MW6.0地震发震断层上触发的库仑应力变化∆CFS

    (a,b) MW7.3地震对 MW6.0地震触发的库仑应力变化∆CFS;(c,d) MW7.3地震的震后余滑对MW6.0地震触发的库仑应力变化∆CFS;(e,f) 本文计算使用的2017年MW7.3地震同震断层模型(Yang et al,2018b)。图中黄色和红色星形分别代表2018年MW6.0和2017年MW7.3地震震源在各自断层面上的投影位置

    Figure  8.  The Coulomb failure stress change ∆CFS on the fault plane of 2018 MW6.0 earthquake triggered by the 2017 MW7.3 earthquake and its afterslip

    (a,b) ∆CFS on the seismogenic fault plane of the MW6.0 earthquake triggered by the MW7.3 earthquake;(c,d) ∆CFS on the fault plane of the MW6.0 earthquake triggered by the MW7.3 earthquake afterslip;(e,f) The coseismic fault of the 2017 MW7.3 earthquake used in the calculation of ∆CFS (Yang et al,2018b)。 The yellow and red stars represent the projected location of the hypocenter of the 2018 MW6.0 and the 2017 MW7.3 events on their fault planes

    图  9  2017年MW7.3 地震的同震及震后断层滑动分布

    Figure  9.  The co- and post-seismic fault slip distribution of the 2017 MW7.3 earthquake

    表  1  Sentinel-1A卫星的SAR影像参数

    Table  1.   SAR image parameters of Sentinel-1A satellite

    轨道方向监测时段影像数量波长/cm飞行角/°入射角/°分辨率/m
    升轨2017-11-23—2018-08-14125.6−9.739.25×20
    降轨2017-11-19—2018-08-22135.6−167.043.95×20
    下载: 导出CSV

    表  2  Sentinel-1B卫星SAR影像参数

    Table  2.   SAR image parameters of the Sentinel-1B satellite

    卫星类型轨道方向获取时间飞行角/°入射角/°垂直基线/m
    震前日期震后日期
    Sentinel-1B升轨2018-08-152018-08-27−12.933.850.6
    Sentinel-1B降轨2018-08-162018-08-28−166.939.2−22.6
    下载: 导出CSV
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出版历程
  • 收稿日期:  2020-08-18
  • 修回日期:  2020-12-15
  • 网络出版日期:  2021-12-06
  • 刊出日期:  2022-06-27

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