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Complex multi-fault rupture and triggering during the 2023 earthquake doublet in southeastern Türkiye

Author

Listed:
  • Chengli Liu

    (China University of Geosciences)

  • Thorne Lay

    (University of California Santa Cruz)

  • Rongjiang Wang

    (China University of Geosciences
    GFZ German Research Centre for Geosciences)

  • Tuncay Taymaz

    (Istanbul Technical University)

  • Zujun Xie

    (China University of Geosciences)

  • Xiong Xiong

    (China University of Geosciences)

  • Tahir Serkan Irmak

    (Kocaeli University)

  • Metin Kahraman

    (Istanbul Technical University)

  • Ceyhun Erman

    (Istanbul Technical University)

Abstract

Two major earthquakes (MW 7.8 and MW 7.7) ruptured left-lateral strike-slip faults of the East Anatolian Fault Zone (EAFZ) on February 6, 2023, causing >59,000 fatalities and ~$119B in damage in southeastern Türkiye and northwestern Syria. Here we derived kinematic rupture models for the two events by inverting extensive seismic and geodetic observations using complex 5-6 segment fault models constrained by satellite observations and relocated aftershocks. The larger event nucleated on a splay fault, and then propagated bilaterally ~350 km along the main EAFZ strand. The rupture speed varied from 2.5-4.5 km/s, and peak slip was ~8.1 m. 9-h later, the second event ruptured ~160 km along the curved northern EAFZ strand, with early bilateral supershear rupture velocity (>4 km/s) followed by a slower rupture speed (~3 km/s). Coulomb Failure stress increase imparted by the first event indicates plausible triggering of the doublet aftershock, along with loading of neighboring faults.

Suggested Citation

  • Chengli Liu & Thorne Lay & Rongjiang Wang & Tuncay Taymaz & Zujun Xie & Xiong Xiong & Tahir Serkan Irmak & Metin Kahraman & Ceyhun Erman, 2023. "Complex multi-fault rupture and triggering during the 2023 earthquake doublet in southeastern Türkiye," Nature Communications, Nature, vol. 14(1), pages 1-14, December.
    • Handle: RePEc:nat:natcom:v:14:y:2023:i:1:d:10.1038_s41467-023-41404-5
    DOI: 10.1038/s41467-023-41404-5
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    References listed on IDEAS

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    1. Ross S. Stein, 1999. "The role of stress transfer in earthquake occurrence," Nature, Nature, vol. 402(6762), pages 605-609, December.
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    Cited by:

    1. Kejie Chen & Guoguang Wei & Christopher Milliner & Luca Dal Zilio & Cunren Liang & Jean-Philippe Avouac, 2024. "Super-shear ruptures steered by pre-stress heterogeneities during the 2023 Kahramanmaraş earthquake doublet," Nature Communications, Nature, vol. 15(1), pages 1-11, December.

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