The source kinematics and slip distribution of the 2023 Mw 6.8 Morocco earthquake

IF 2.2 4区地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY

Journal of African Earth Sciences Pub Date : 2024-10-15 DOI:10.1016/j.jafrearsci.2024.105451

Wenqiang Wu, Yongzhi Zhang, Xiaoye Hao, Jiaojiao Liu

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引用次数: 0

Abstract

On September 8, 2023, an Mw 6.8 earthquake struck Haouz province (Morocco), in the central Atlas Mountains, causing many casualties. In this study, we obtain the co-seismic deformation field with the D-InSAR and the Pixel Offset Tracking (POT), and three-dimensional displacement with the strain model-variance component estimation method (SM-VCE). The results indicate that this earthquake belongs to a typical thrust earthquake, and the displacement components in the west-east (W-E) and vertical are quite obvious. Besides, the rupture length from the POT method is about 40 km, and the strike is west-north-west (WNW), consistent with that of the Atlas Mountains. According to the slip inversion, the rupture depth of the fault is about 30 km, and the peak slip is approximately 1.6 m at depths of about 22.75 km. Similarly, the strike is 260°, the dip angle is 70° and the rake angle is 75°, respectively. Moreover, the released energy from this earthquake is approximately a Mw 6.8 earthquake. In addition to the earthquake destruction, the local economic foundation and building structure are crucial reasons for the serious casualties. Therefore, the method in this study could provide references for seismic research and the results could help explore the focal mechanism along the High Atlas in Morocco.

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2023 年摩洛哥 6.8 级地震的震源运动学和滑移分布

2023 年 9 月 8 日，摩洛哥阿特拉斯山脉中部的豪兹省（Haouz）发生 Mw 6.8 级地震，造成多人伤亡。在本研究中，我们利用 D-InSAR 和像素偏移跟踪（POT）获得了共震变形场，并利用应变模型-方差分量估计法（SM-VCE）获得了三维位移。结果表明，此次地震属于典型的推挤地震，西-东（W-E）和垂直方向的位移分量比较明显。此外，POT 方法得出的断裂长度约为 40 km，走向为西-北-西（WNW），与阿特拉斯山脉的走向一致。根据滑移反演，该断层的断裂深度约为 30 千米，在约 22.75 千米处的滑移峰值约为 1.6 米。同样，断层走向为 260°，倾角为 70°，倾斜角为 75°。此外，这次地震释放的能量约为 Mw 6.8。除了地震破坏之外，当地的经济基础和建筑结构也是造成严重人员伤亡的重要原因。因此，本研究的方法可为地震研究提供参考，其结果有助于探索摩洛哥高阿特拉斯地区的震源机制。

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来源期刊

Journal of African Earth Sciences 地学-地球科学综合

CiteScore

4.70

自引率

4.30%

发文量

240

审稿时长

12 months

期刊介绍： The Journal of African Earth Sciences sees itself as the prime geological journal for all aspects of the Earth Sciences about the African plate. Papers dealing with peripheral areas are welcome if they demonstrate a tight link with Africa. The Journal publishes high quality, peer-reviewed scientific papers. It is devoted primarily to research papers but short communications relating to new developments of broad interest, reviews and book reviews will also be considered. Papers must have international appeal and should present work of more regional than local significance and dealing with well identified and justified scientific questions. Specialised technical papers, analytical or exploration reports must be avoided. Papers on applied geology should preferably be linked to such core disciplines and must be addressed to a more general geoscientific audience.