Geometric controls on cascading rupture of the 2023 Kahramanmaraş earthquake doublet

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

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)1054-1060
Number of pages7
JournalNature Geoscience
Volume16
Issue number11
DOIs
Publication statusPublished - Nov 2023

Bibliographical note

Publisher Copyright:
© 2023, The Author(s), under exclusive licence to Springer Nature Limited.

Funding

H.S. was supported by the Strategic Priority Research Program of the Chinese Academy of Sciences (XDB 41000000). R.G. and X.T. were supported by the State Key Laboratory of Geodesy and Earth’s Dynamics (S22L620104). Y. Zhang, R.G., X.T. and J.W. were supported by the Open Fund of Wuhan Gravitation and Solid Earth Tides National Observation and Research Station (WHYWZ202210). Y. Zheng and D.L. were supported by the NSFC grants (42274082, 42030108). The teleseismic waveforms of the China array are provided by the Data Management Center of China National Seismic Network at the Institute of Geophysics, China Earthquake Administration. T.T. and T.E. acknowledge the Istanbul Technical University Research Fund (ITU-BAP) and the Alexander von Humboldt Foundation Research Fellowship Award for providing computing facilities through the Humboldt-Stiftung Follow-Up Program. H.S. was supported by the Strategic Priority Research Program of the Chinese Academy of Sciences (XDB 41000000). R.G. and X.T. were supported by the State Key Laboratory of Geodesy and Earth’s Dynamics (S22L620104). Y. Zhang, R.G., X.T. and J.W. were supported by the Open Fund of Wuhan Gravitation and Solid Earth Tides National Observation and Research Station (WHYWZ202210). Y. Zheng and D.L. were supported by the NSFC grants (42274082, 42030108). The teleseismic waveforms of the China array are provided by the Data Management Center of China National Seismic Network at the Institute of Geophysics, China Earthquake Administration. T.T. and T.E. acknowledge the Istanbul Technical University Research Fund (ITU-BAP) and the Alexander von Humboldt Foundation Research Fellowship Award for providing computing facilities through the Humboldt-Stiftung Follow-Up Program.

FundersFunder number
Alexander von Humboldt-Stiftung
National Natural Science Foundation of China42030108, 42274082
Chinese Academy of SciencesXDB 41000000
Istanbul Teknik Üniversitesi
State Key Laboratory of Geodesy and Earth's Dynamics, Chinese Academy of SciencesS22L620104, WHYWZ202210
Institute of Geology, China Earthquake Administration
Bilimsel Araştırma Projeleri Birimi, İstanbul Teknik Üniversitesi

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