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Journal Article

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

Authors

Liu,  Chengli
External Organizations;

Lay,  Thorne
External Organizations;

/persons/resource/wang

Wang,  R.
2.1 Physics of Earthquakes and Volcanoes, 2.0 Geophysics, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

Taymaz,  Tuncay
External Organizations;

Xie,  Zujun
External Organizations;

Xiong,  Xiong
External Organizations;

Irmak,  Tahir Serkan
External Organizations;

Kahraman,  Metin
External Organizations;

Erman,  Ceyhun
External Organizations;

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Fulltext (public)

5024409.pdf
(Publisher version), 6MB

Supplementary Material (public)
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Citation

Liu, C., Lay, T., Wang, R., Taymaz, T., Xie, Z., Xiong, X., Irmak, T. S., Kahraman, M., Erman, C. (2023): Complex multi-fault rupture and triggering during the 2023 earthquake doublet in southeastern Türkiye. - Nature Communications, 14, 5564.
https://doi.org/10.1038/s41467-023-41404-5


Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5024409
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.