利用InSAR观测研究2022年伊朗地震序列触发机制及其对基础设施的影响

杜静; 宋闯; 李振洪; 刘振江; 刘海辉; 余琛; 彭建兵

doi:10.13203/j.whugis20240106

利用InSAR观测研究2022年伊朗地震序列触发机制及其对基础设施的影响

杜静^{1, 2, 3,},
宋闯^{1, 2, 4, ,},
李振洪^{1, 2, 4, ,},
刘振江^{1, 2, 3},
刘海辉^{1, 2, 3},
余琛^{1, 2, 4},
彭建兵^{1, 2, 5}

1.
长安大学地质工程与测绘学院,陕西西安,710054
2.
黄土科学全国重点实验室,陕西西安,710054
3.
长安大学地学与卫星大数据研究中心,陕西西安,710054
4.
西部矿产资源与地质工程教育部重点实验室,陕西西安,710054
5.
自然资源部生态地质与灾害防控重点实验室,陕西西安,710054

基金项目:

国家重点研发计划 2020YFC1512000

陕西省科技创新团队 2021TD-51

陕西省地学大数据与地质灾害防治创新团队（2022）

中央高校基本科研业务费专项 300102260301

中央高校基本科研业务费专项 300102261108

中央高校基本科研业务费专项 300102263717

详细信息

作者简介:
杜静,硕士,主要从事InSAR形变测量和地震断层反演研究。2021126053@chd.edu.cn

通讯作者:
宋闯,博士。chuang.song@chd.edu.cn

李振洪,博士,教授。zhenhong.li@chd.edu.cn

计量
- 文章访问数: 262
- HTML全文浏览量: 24
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出版历程
- 收稿日期: 2024-03-27
- 网络出版日期: 2024-06-24
- 刊出日期: 2024-10-04

Triggering Mechanism and Impact on Infrastructure of the 2022 Iran Earthquake Sequence Revealed by InSAR Observations

DU Jing^{1, 2, 3,},
SONG Chuang^{1, 2, 4, ,},
LI Zhenhong^{1, 2, 4, ,},
LIU Zhenjiang^{1, 2, 3},
LIU Haihui^{1, 2, 3},
YU Chen^{1, 2, 4},
PENG Jianbing^{1, 2, 5}

1.
College of Geological Engineering and Geomatics, Chang'an University, Xi'an710054, China
2.
Key Laboratory of Loess, Xi'an710054, China
3.
Big Data Center for Geosciences and Satellites, Chang'an University, Xi'an710054, China
4.
Key Laboratory of Western China's Mineral Resources and Geological Engineering, Ministry of Education, Xi'an710054, China
5.
Key Laboratory of Ecological Geology and Disaster Prevention, Ministry of Natural Resources, Xi'an710054, China

摘要

摘要:
2022-07-01伊朗南部的霍尔木兹甘省发生两次Mw 6.0和一次Mw 5.7地震,11-30在距这两次地震不足10 km的位置,又发生了Mw 5.7地震。利用欧洲空间局哨兵一号数据,通过合成孔径雷达干涉测量技术获取2022-07-01—2022-11-30地震序列的同震形变场,进而利用弹性半空间的位错模型反演得到地震序列的断层参数和滑动分布,并利用库仑应力研究了07-01地震对11-30地震的触发关系,讨论了这一地震序列的断层几何和对公路等震区基础设施的影响。结果表明,这一地震序列均为逆冲型地震,最大地表永久变形量超过36 cm,地震造成了震中区域公路和房屋等基础设施不同程度损毁。07-01地震的断层最大滑动量为2.4 m,发生在地下8 km左右；11-30地震的断层最大滑动量约为0.5 m,发生在地下8 km左右。对地震序列进行库仑应力分析显示,07-01地震对11-30地震有显著触发作用。这一地震序列中,不同地震的发震断层在空间上交叉重叠度较高,说明可能发生在同一个逆冲断层系统,而这一断层系统是通过此次地震序列新发现的隐伏断层,其未来的地震危险性值得持续关注。
- 伊朗地震序列 /
- 合成孔径雷达干涉测量 /
- 同震地表形变 /
- 断层滑动分布 /
- 触发机制 /
- 基础设施
Abstract:
Objective
On July 1, 2022, Two Mw 6.0 and an Mw 5.7 earthquake events occurred in Hormuzgan Province of southern Iran, followed by an Mw 5.7 earthquake on 30 November at a location of less than 10 km.
Methods
We first use European Space Agency Sentinel-1 data to obtain the coseismic deformation of the 1 July and 30 November events by interferometric synthetic aperture radar（InSAR）technique and invert the InSAR result for fault parameters and slip distribution of the earthquake sequence. Then we investigate the triggering relationship of the 1 July earthquakes to the 30 November earthquake by using the Coulomb stress. Finally, we discuss the fault geometry of this earthquake sequence and its impact on infrastructure and highways in earthquake areas.
Results
Experimental results show that all events in this earthquake sequence are thrust-type, with the maximum coseismic deformation reaching 36 cm, which together with the induced geohazards, cause varying degrees of damage to infrastructure (e.g., roads and houses in the epicenter area). The maximum slip on the fault of the 1 July earthquakes is 2.4 m, occurring at a depth of about 8 km, and the maximum slip on the fault of the 30 November earthquake is 0.5 m (about 8 km deep). The Coulomb stress change results reveal that the 1 July earthquakes have a significant triggering effect on the 30 November earthquake.
Conclusions
The high spatial overlap of the different earthquakes faults in this earthquake sequence suggests that they may have occurred on the same thrust-fault system, which are hidden faults newly discovered through the sequence. The future seismic hazard of this fault system deserves continued attention.
- Iran earthquake sequence /
- synthetic aperture radar interferometry /
- coseismic surface deformation /
- fault slip distribution /
- triggering mechanism /
- infrastructure
http://ch.whu.edu.cn/cn/article/doi/10.13203/j.whugis20240106

HTML全文

感谢ESA提供的Sentinel‑1A雷达影像数据；文中绝大部分图件采用GMT绘制。

http://ch.whu.edu.cn/cn/article/doi/10.13203/j.whugis20240106

图 1 2022年伊朗地震序列的区域构造背景

Figure 1. Tectonic Background of the 2022 Iran Earthquakes

下载: 全尺寸图片幻灯片

图 2 2022‑07‑01伊朗地震同震形变场

Figure 2. Coseismic Surface Deformation Fields of July 1, 2022, Iran Earthquakes

下载: 全尺寸图片幻灯片

图 3 2022‑11‑30伊朗地震同震形变场

Figure 3. Coseismic Surface Deformation Fields of November 30, 2022 Iran Earthquake

下载: 全尺寸图片幻灯片

图 4 2022‑07‑01地震的最优倾角和滑动因子、滑动分布及模型不确定性

Figure 4. Optimal Dip Angle and Smoothing Factors, Slip Distribution and Model Uncertainty of July 1, 2022 Iran Earthquake

下载: 全尺寸图片幻灯片

图 5 2022‑11‑30地震的最优倾角和滑动因子、滑动分布及模型不确定性

Figure 5. Optimal Dip Angle and Smoothing Factors, Slip Distribution and Model Uncertainty of November 30, 2022 Iran Earthquake

下载: 全尺寸图片幻灯片

图 6 2022‑07‑01地震引起邻近区域静态库仑应力变化

Figure 6. Static Coulomb Stress Changes in Neighboring Regions Caused by the Earthquake on July 1, 2022 at the Depth of 5 km and 7 km

下载: 全尺寸图片幻灯片

图 7 2022‑07‑01地震在2022‑11‑30地震断层面上造成的静态库仑应力分布

Figure 7. Static Coulomb Stress Distribution on the Fault Plane of the 30 November 2022 Earthquake Induced by the 1 July 2022 Earthquake

下载: 全尺寸图片幻灯片

图 8 2022年伊朗Mw 5.7~ 6.0地震序列的同震地表形变场、基于分布式滑动分布模拟图和残差图

Figure 8. Observed Coseismic Interferograms, Modeled Interferograms of the 2022 Iran Mw 5.7-6.0 Earthquake Sequence, and the Model Residuals

下载: 全尺寸图片幻灯片

图 9 2022‑07‑01伊朗地震序列建筑物损毁指标图及附近建筑物道路损毁照片

Figure 9. Building Damage Proxy Map of the July 1, 2022 Iran Earthquake Sequence and Photographs of Damaged Buildings and Roads Near the Epicenter

下载: 全尺寸图片幻灯片

表 1 用于InSAR分析的SAR影像参数

Table 1 Parameters of SAR Images for InSAR Analysis

地震发生时间	轨道	飞行方向	获取时间		时间基线/d	空间基线/m
地震发生时间	轨道	飞行方向	主影像	辅影像	时间基线/d	空间基线/m
2022-07-01	130	升轨	2022-06-22	2022-07-04	12	20.9
2022-07-01	166	降轨	2022-06-25	2022-07-07	12	－86.8
2022-11-30	130	升轨	2022-11-25	2022-12-07	12	115.1
2022-11-30	166	降轨	2022-11-28	2022-12-10	12	0.8

下载: 导出CSV

表 2 不同断层模型对应的残差均方根、拟合度、断层参数

Table 2 Residual Root Mean Squares, Fitting Ratios and Fault Parameters for Different Fault Models

断层模型	走向/(°)	倾角/(°)	长度/km	宽度/km	震源位置（本文）	残差均方根/cm	拟合度/%
2022-07-01反演模型	98.0	61.2	30.0	15.0	（55.32°E,26.84°N）	2.4	95.5
2022-11-30反演模型	99.7	68.0	22.0	16.0	（55.33°E,26.84°N）	1.4	71.3
两次联合反演模型	102.0	65.0	25.0	15.0	（55.32°E,26.85°N）	2.9	95.5
应用于2022-07-01	102.0	63.0	30.0	15.0	（55.32°E,26.85°N）	2.6	94.5
应用于2022-11-30	102.0	67.0	22.0	15.0	（55.32°E,26.85°N）	1.4	70.0

下载: 导出CSV

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