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

doi:10.11939/jass.20200140

2017年伊朗M_W7.3地震的震后余滑分布及其对2018年M_W6.0地震的触发影响

蒋子琴^1, ,,
杨莹辉²,
陈强¹,
徐倩¹,
徐浪¹,
黄小梅¹

1.
中国成都 611756 西南交通大学地球科学与环境工程学院
2.
中国成都 610059 成都理工大学地质灾害防治与地质环境保护国家重点实验室

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
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出版历程
- 收稿日期: 2020-08-17
- 修回日期: 2020-12-14
- 网络出版日期: 2021-12-05
- 发布日期: 2022-06-26

Afterslip distribution of 2017 Iran M_W7.3 earthquake and its triggering effects on the 2018 M_W6.0 earthquake

1.
Faculty of Geosciences and Environmental Engineering，Southwest Jiaotong University，Chengdu 611756，China
2.
State Key Laboratory of Geohazard Prevention and Geoenvironment Protection，Chengdu University of Technology，Chengdu 610059，China

摘要

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M_W7.3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M_W6.0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M_W7.3强震及其震后活动对2018年贾万鲁德M_W6.0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M_W7.3主震及其震后余滑对2018年M_W6.0地震的发生具有一定的触发效应，M_W6.0地震的发生可能与区域板块的活动性相关。
- 伊朗地震 /
- InSAR时序分析 /
- 余滑模型 /
- 震源机制反演 /
- 应力触发
Abstract: In this study, a set of radar images acquired by the Sentinel-1 satellite that covers the interested seismically-effected area were collected. The time-series surface deformation of the 283-day time span after the 2017 Sarpol Zahab, Iran, M_W7.3 earthquake was extracted by using small baseline subset technique, then the two-step procedure inversion is carried out to obtain the afterslip distribution. In order to analyze the triggering effects of the 2017 strong earthquake and its post-seismic faulting on the 2018 Javanrud M_W6.0 earthquake, the coseismic deformation field covering the whole M_W6.0 earthquake region was obtained by using differential interferometry technique, and the inversion results of seismogenic fault parameters were used as receiving fault parameters for stress calculation. The results show that the post-seismic deformation of the Sarpol Zahab earthquake is mainly dominated by the afterslip effect. 283 days after the earthquake, the accumulative slip of the after-slip model reaches up to 0.7 m. The coseismic source model of the Javanrud M_W6.0 earthquake indicates that the seismogenic fault strike is 355.6°, the dip angle is 89.4°, and the rupture of coseismic fault is characterized by the right-lateral strike-slip together with some normal dip-slip component. Moreover, the calculated Coulomb stress change suggests that the M_W7.3 earthquake and its afterslip have triggering effect on the subsequent Javanrud M_W6.0 earthquake, and the occurrence of Javanrud earthquake could also be contributed by the regional plate activity.
- Iran earthquake /
- InSAR time-series analysis /
- afterslip model /
- focal mechanism inversion /
- stress triggering

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图 6 2018年贾万鲁德M_W6.0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 M_W6.0 earthquake in 2018

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

下载: 全尺寸图片幻灯片

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

下载: 全尺寸图片幻灯片

图 2 2017年萨波尔扎哈布M_W7.3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 M_W7.3 earthquake in 2017

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

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图 3 点形变序列（a）及震后余滑的地震矩张量M₀和矩震级M_W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 M_W of the afterslip with post-seismic time （b）

下载: 全尺寸图片幻灯片

图 4 2017年萨波尔扎哈布M_W7.3地震的震后余滑分布

Figure 4. The afterslip distribution of Sarpol Zahab M_W7.3 earthquake in 2017

下载: 全尺寸图片幻灯片

图 5 2017年萨波尔扎哈布M_W7.3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 M_W7.3 earthquake in 2017。（b） The descending deformation field

下载: 全尺寸图片幻灯片

图 7 InSAR反演所得的贾万鲁德M_W6.0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M_W6.0地震震源在断层面上的投影位置

Figure 7. Fault slip model of the Javanrud M_W6.0 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 M_W6.0 Javanrud earthquake

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图 8 2017年萨波尔扎哈布M_W7.3地震及其震后余滑在2018年贾万鲁德M_W6.0地震发震断层上触发的库仑应力变化∆CFS

（a，b） M_W7.3地震对 M_W6.0地震触发的库仑应力变化∆CFS；（c，d） M_W7.3地震的震后余滑对M_W6.0地震触发的库仑应力变化∆CFS；（e，f）本文计算使用的2017年M_W7.3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M_W6.0和2017年M_W7.3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 M_W6.0 earthquake triggered by the 2017 M_W7.3 earthquake and its afterslip

（a，b） ∆CFS on the seismogenic fault plane of the M_W6.0 earthquake triggered by the M_W7.3 earthquake；（c，d） ∆CFS on the fault plane of the M_W6.0 earthquake triggered by the M_W7.3 earthquake afterslip；（e，f） The coseismic fault of the 2017 M_W7.3 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 M_W6.0 and the 2017 M_W7.3 events on their fault planes

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图 9 2017年M_W7.3 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 M_W7.3 earthquake

下载: 全尺寸图片幻灯片

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—2018-08-14	12	5.6	−9.7	39.2	5×20
降轨	2017-11-19—2018-08-22	13	5.6	−167.0	43.9	5×20

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
卫星类型	轨道方向	震前日期	震后日期	飞行角/°	入射角/°	垂直基线/m
Sentinel-1B	升轨	2018-08-15	2018-08-27	−12.9	33.8	50.6
Sentinel-1B	降轨	2018-08-16	2018-08-28	−166.9	39.2	−22.6

下载: 导出CSV

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