首页|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

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

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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.
Triggering Mechanism and Impact on Infrastructure of the 2022 Iran Earthquake Sequence Revealed by InSAR Observations
Objective:On July 1,2022,Two Mw 6.0 and an Mw 5.7 earthquake events occurred in Hor-muzgan 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 defor-mation of the 1 July and 30 November events by interferometric synthetic aperture radar(InSAR)tech-nique 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 sys-tem deserves continued attention.

Iran earthquake sequencesynthetic aperture radar interferometrycoseismic surface deforma-tionfault slip distributiontriggering mechanisminfrastructure

杜静、宋闯、李振洪、刘振江、刘海辉、余琛、彭建兵

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长安大学地质工程与测绘学院,陕西 西安,710054

黄土科学全国重点实验室,陕西 西安,710054

长安大学地学与卫星大数据研究中心,陕西 西安,710054

西部矿产资源与地质工程教育部重点实验室,陕西 西安,710054

自然资源部生态地质与灾害防控重点实验室,陕西 西安,710054

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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

国家重点研发计划陕西省科技创新团队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中央高校基本科研业务费专项中央高校基本科研业务费专项

2020YFC15120002021TD-51300102260301300102261108300102263717

2024

10.13203/j.whugis20240106

武汉大学学报(信息科学版)
武汉大学

武汉大学学报(信息科学版)

CSTPCD北大核心
影响因子：1.072
ISSN：1671-8860
年,卷(期)：2024.49(10)