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<p>On September 8, 2023, a significant earthquake struck the Al Haouz region, located southwest of Marrakech in the High Atlas Mountains of Morocco, causing widespread damage and raising urgent questions about the region’s tectonic structures. In response, this study aims to identify the active faults using radar interferometry and 3D fault plane modeling derived from seismic data. The analysis unveils the neotectonic and seismic complexity of the Paleozoic massif in the Moroccan High Atlas, shaped by the ongoing convergence between the African and Eurasian plates. Radar interferometry detected a compressive deformation style, showing a maximum uplift of 20&#xa0;cm between the Tizi N’Test and Erdouz faults, and subsidence in the Al Haouz and Souss plains. The 3D modeling provides substantial insights into the intensity of seismic activity along the Tizi N’Test fault network during the main earthquake, as well as into the significant post-seismic reactivation of the Tadafalt, Tinmel, and Erdouz faults on the northern side, and of faults within the South Sub-Atlas zone. The analyses critically investigate the distribution and dissipation of seismic rupture at post-seismic deformations, predominantly within pop-up structures. Findings of this work demonstrate the effectiveness of combining radar interferometry with 3D modeling to achieve a comprehensive understanding of seismic deformation mechanisms. A key innovative contribution is the identification and quantification of post-seismic fault reactivation across multiple networks, demonstrating that seismic energy was not confined to a single rupture plane but was redistributed through structurally inherited pop-up geometries. This provides new insights into strain partitioning and delayed deformation processes in intracontinental compressional belts, a topic that remains understudied.</p>

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Detection of deformations and active faults related to the Al Haouz Mw 6.8 earthquake on September 8, 2023 (High Atlas, Morocco): an integrated approach combining radar interferometry and 3D seismic data modeling

  • 期刊论文

  • 发表日期：

    2026年4月17日

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  • Allal Labriki,
  • Mohamed El Hilali,
  • Yasmina Bouchatta,
  • Youssef Timoulali,
  • Shuraik Kader,
  • Hassan El Hadi,
  • Sara Zoraa,
  • Saïd Chakiri

摘要

On September 8, 2023, a significant earthquake struck the Al Haouz region, located southwest of Marrakech in the High Atlas Mountains of Morocco, causing widespread damage and raising urgent questions about the region’s tectonic structures. In response, this study aims to identify the active faults using radar interferometry and 3D fault plane modeling derived from seismic data. The analysis unveils the neotectonic and seismic complexity of the Paleozoic massif in the Moroccan High Atlas, shaped by the ongoing convergence between the African and Eurasian plates. Radar interferometry detected a compressive deformation style, showing a maximum uplift of 20 cm between the Tizi N’Test and Erdouz faults, and subsidence in the Al Haouz and Souss plains. The 3D modeling provides substantial insights into the intensity of seismic activity along the Tizi N’Test fault network during the main earthquake, as well as into the significant post-seismic reactivation of the Tadafalt, Tinmel, and Erdouz faults on the northern side, and of faults within the South Sub-Atlas zone. The analyses critically investigate the distribution and dissipation of seismic rupture at post-seismic deformations, predominantly within pop-up structures. Findings of this work demonstrate the effectiveness of combining radar interferometry with 3D modeling to achieve a comprehensive understanding of seismic deformation mechanisms. A key innovative contribution is the identification and quantification of post-seismic fault reactivation across multiple networks, demonstrating that seismic energy was not confined to a single rupture plane but was redistributed through structurally inherited pop-up geometries. This provides new insights into strain partitioning and delayed deformation processes in intracontinental compressional belts, a topic that remains understudied.