Source parameters of the May 28, 2016, Mihoub earthquake (Mw 5.4, Algeria) deduced from Bayesian modelling of Sentinel-1 SAR data

IF 1.6 4区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS Journal of Seismology Pub Date : 2024-09-13 DOI:10.1007/s10950-024-10243-2
S. Miloudi, M. Meghraoui, T. Nozadkhalil, E. Cetin, F. Semmane, M. Khelif
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Abstract

Synthetic aperture radar interferometry (InSAR) is a powerful technique for quantifying the co- and postseismic deformation of large earthquakes at the Earth’s surface. However, surface deformation caused by small- to moderate-sized earthquakes is rarely revealed by InSAR because their coseismic slip occurs mostly at significant depths (> 5 km), with limited deformation on the Earth’s surface. In this work, we investigate the surface deformation associated with the Mw 5.4 May 28, 2016, Mihoub (Algeria) earthquake and its source parameters. Interferograms calculated from Sentinel-1 TOPSAR images of both ascending and descending orbits show that, despite its small size, the earthquake produced evident deformation on the Earth’s surface, suggesting that the coseismic slip took place at a relatively shallow depth. We model the coseismic displacement fields extracted from InSAR time series using Bayesian approaches in two stages: 1) we model the coseismic slip data using uniform slip on a single fault to constrain the fault parameters. 2) We explore a variable slip model with varying rakes on the discretized fault obtained in the first stage. The modelling results indicate that the earthquake was associated with a ~ 0.5 m shallow oblique reverse slip, mostly between depths of 1.5 and 4.5 km, on a NE–SW-trending and SE-dipping thrust fault, which is in good agreement with the focal mechanism solutions of the earthquake deduced from seismology. This study demonstrates that the multitemporal InSAR (MTI) method may constrain surface displacements when the coseismic interferograms of moderate- to small-sized earthquakes are noisy and hence difficult to unwrap. The newly identified seismogenic Mihoub fault has implications for seismic hazard assessment in northern Algeria.

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通过对 Sentinel-1 SAR 数据进行贝叶斯建模推导出的 2016 年 5 月 28 日 Mihoub 地震(阿尔及利亚,5.4 级)震源参数
合成孔径雷达干涉测量法(InSAR)是量化地球表面大地震共震和震后变形的强大技术。然而,InSAR 却很少揭示中小型地震引起的地表形变,因为这些地震的共震滑动大多发生在相当大的深度(> 5 km),地球表面的形变有限。在这项工作中,我们研究了与 2016 年 5 月 28 日 Mw 5.4 级米胡布(阿尔及利亚)地震相关的地表形变及其震源参数。根据哨兵 1 号 TOPSAR 图像计算出的上升和下降轨道干涉图显示,尽管地震规模较小,但却在地球表面产生了明显的形变,表明共震滑动发生在相对较浅的深度。我们采用贝叶斯方法,分两个阶段对从 InSAR 时间序列中提取的共震位移场进行建模:1) 我们使用单一断层上的均匀滑动对同震滑动数据进行建模,以约束断层参数。2) 我们在第一阶段获得的离散断层上探索了一个具有不同耙距的可变滑移模型。建模结果表明,地震与一条东北-西南走向、向东南倾斜的推力断层上约 0.5 米的浅斜反向滑动有关,主要发生在 1.5 至 4.5 千米深度之间,这与地震学推导出的地震焦点机制解十分吻合。这项研究表明,当中小规模地震的共震干涉图噪声较大,难以解包时,多时相 InSAR(MTI)方法可以约束地表位移。新发现的 Mihoub 地震断层对阿尔及利亚北部的地震灾害评估具有重要意义。
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来源期刊
Journal of Seismology
Journal of Seismology 地学-地球化学与地球物理
CiteScore
3.30
自引率
6.20%
发文量
67
审稿时长
3 months
期刊介绍: Journal of Seismology is an international journal specialising in all observational and theoretical aspects related to earthquake occurrence. Research topics may cover: seismotectonics, seismicity, historical seismicity, seismic source physics, strong ground motion studies, seismic hazard or risk, engineering seismology, physics of fault systems, triggered and induced seismicity, mining seismology, volcano seismology, earthquake prediction, structural investigations ranging from local to regional and global studies with a particular focus on passive experiments.
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