Geometric controls on cascading rupture of the 2023 Kahramanmaraş earthquake doublet Türkiye

Fakültemiz Jeofizik Mühendisliği Öğretim Üyelerinden Prof. Dr. Tuncay Taymaz ve Doç. Dr. Tuna Eken'in 6 Şubat 2023 tarihinde Güneydoğu Bölgesinde meydana gelen depremler ile ilgili makalesi Nature Geoscience adlı dergide yayınlanmıştır.

Makale adı: Geometric controls on cascading rupture of the 2023 Kahramanmaraş earthquake doublet Türkiye

Yazarlar:  Yijun Zhang, Xiongwei Tang, Dechuan Liu, Tuncay Taymaz, Tuna Eken, Rumeng Guo, Yong Zheng, Jingqi Wang & Heping Sun

Özet:
How fault geometry controls the rupture propagation and segmentation of a strike-slip event is an open question. Deciphering the relationship between the geometric fault complexity and seismic kinematics is essential for both understanding the seismic hazard posed by a particular fault and gaining insights into the fundamental mechanics of earthquake rupture. Here we integrate the finite-fault inversion of synthetic aperture radar observations and back projection of high-frequency teleseismic array waveforms to investigate the rupture geometry of the 2023 M_w 7.8 and M_w 7.6 Kahramanmaraş (southeastern Turkey) earthquake doublet and its impact on the kinematics and slip distribution. We find that large slip asperities are separated by fault bends, whereas intense high-frequency (~1 Hz) sources occur near the branching junctions, suggesting that geometric barriers could decelerate rupture propagation and enhance high-frequency wave radiations. In addition, supershear rupture propagating along the relatively high-velocity material is prone to occur on geometrically simple and smooth faults with relatively few aftershocks. These kinematic characteristics highlight that the geometric complexity of the fault system may be a key factor in the irregular cascading rupture process.

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