Sub- and super-shear ruptures during the 2023 Mw 7.8 and Mw 7.6 earthquake doublet in SE Türkiye

Authors

  • Diego Melgar Department of Earth Sciences, University of Oregon, Eugene, U.S.A
  • Tuncay Taymaz Department of Geophysical Engineering, The Faculty of Mines, Istanbul Technical University, Maslak 34467, Sarıyer, Istanbul, Türkiye https://orcid.org/0000-0001-6807-9622
  • Athanassios Ganas National Observatory of Athens, Institute of Geodynamics, Athens, Greece https://orcid.org/0000-0002-1937-3283
  • Brendan Crowell Department of Earth and Space Sciences, University of Washington, Seattle, Washington https://orcid.org/0000-0001-7096-601X
  • Taylan Öcalan Department of Geomatic Engineering, Faculty of Civil Engineering, Yildiz Technical University, Davutpaşa 34220, Istanbul, Türkiye https://orcid.org/0000-0003-0861-013X
  • Metin Kahraman Eurasia Institute of Earth Sciences, Istanbul Technical University, Maslak 34469, Sarıyer, Istanbul, Türkiye https://orcid.org/0000-0003-0208-1660
  • Varvara Tsironi National Observatory of Athens, Institute of Geodynamics, Athens, Greece. Department of Geology, University of Patras, 26504 Rio, Greece. https://orcid.org/0000-0002-5701-3262
  • Seda Yolsal-Çevikbilen Department of Geophysical Engineering, The Faculty of Mines, Istanbul Technical University, Maslak 34467, Sarıyer, Istanbul, Türkiye https://orcid.org/0000-0002-7250-4617
  • Sotiris Valkaniotis Department of Civil Engineering, Democritus University of Thrace, 67100 Xanthi, Greece https://orcid.org/0000-0003-0003-2902
  • Tahir Serkan Irmak Department of Geophysical Engineering, Kocaeli University, 41380 Umuttepe, Kocaeli, Türkiye https://orcid.org/0000-0002-4504-6286
  • Tuna Eken Department of Geophysical Engineering, The Faculty of Mines, Istanbul Technical University, Maslak 34467, Sarıyer, Istanbul, Türkiye https://orcid.org/0000-0001-7980-9715
  • Ceyhun Erman Department of Geophysical Engineering, The Faculty of Mines, Istanbul Technical University, Maslak 34467, Sarıyer, Istanbul, Türkiye https://orcid.org/0000-0002-5127-6387
  • Berkan Özkan Department of Geophysical Engineering, The Faculty of Mines, Istanbul Technical University, Maslak 34467, Sarıyer, Istanbul, Türkiye https://orcid.org/0000-0001-6187-579X
  • Ali Hasan Dogan Department of Geomatic Engineering, Faculty of Civil Engineering, Yildiz Technical University, Davutpaşa 34220, Istanbul, Türkiye https://orcid.org/0000-0002-8490-890X
  • Cemali Altuntaş Department of Geomatic Engineering, Faculty ofCivil Engineering, Yildiz Technical University, Davutpaşa 34220, Istanbul, Türkiye https://orcid.org/0000-0002-9660-6124

DOI:

https://doi.org/10.26443/seismica.v2i3.387

Keywords:

Earthquake sources, Inversion, Strike-slip faulting

Abstract

An earthquake doublet (Mw 7.8 and Mw 7.6) occurred on the East Anatolian Fault Zone (EAFZ) on February 6th, 2023. The events produced significant ground motions and caused major impacts to life and infrastructure throughout SE Türkiye and NW Syria. Here we show the results of earthquake relocations of the first 11 days of aftershocks and rupture models for both events inferred from the kinematic inversion of HR-GNSS and strong motion data considering a multi-fault, 3D geometry. We find that the first event nucleated on a previously unmapped fault before transitioning to the East Anatolian Fault (EAF) rupturing for ~350 km and that the second event ruptured the Sürgü fault for ~160 km. Maximum rupture speeds were estimated to be 3.2 km/s for the Mw 7.8 event. For the Mw 7.6 earthquake, we find super-shear rupture at 4.8 km/s westward but sub-shear eastward rupture at 2.8 km/s. Peak slip for both events were as large as ~8m and ~6m, respectively.

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Published

2023-03-13

How to Cite

Melgar, D., Taymaz, T., Ganas, A., Crowell, B., Öcalan, T., Kahraman, M., Tsironi, V., Yolsal-Çevikbilen, S., Valkaniotis, S., Irmak, T. S., Eken, T., Erman, C., Özkan, B., Dogan, A. H., & Altuntaş, C. (2023). Sub- and super-shear ruptures during the 2023 Mw 7.8 and Mw 7.6 earthquake doublet in SE Türkiye. Seismica, 2(3). https://doi.org/10.26443/seismica.v2i3.387

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Vol. 2 No. 3: Special Issue: 2023 Türkiye/Syria earthquakes

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Fast Reports

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Copyright (c) 2023 Diego Melgar, Tuncay Taymaz, Athanassios Ganas, Brendan Crowell, Taylan Öcalan, Metin Kahraman, Varvara Tsironi, Seda Yolsal-Çevikbil, Sotiris Valkaniotis, Tahir Serkan Irmak, Tuna Eken, Ceyhun Erman, Berkan Özkan, Ali Hasan Dogan, Cemali Altuntaş

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