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Diverse Rupture Characteristics between the 2023 Mw 7.8 and Mw 7.5 Turkey Earthquakes

Authors

Ye,  Lingling
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Xia,  Tao
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Taymaz,  Tuncay
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Irmak,  Tahir Serkan
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Özkan,  Berkan
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Kanamori,  Hiroo
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Rivera,  Luis
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Sang,  Yingquan
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Lay,  Thorne
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

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Citation

Ye, L., Xia, T., Taymaz, T., Irmak, T. S., Özkan, B., Kanamori, H., Rivera, L., Sang, Y., Lay, T. (2023): Diverse Rupture Characteristics between the 2023 Mw 7.8 and Mw 7.5 Turkey Earthquakes, XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023).
https://doi.org/10.57757/IUGG23-5013


Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5021412
Abstract
On 6 February 2023, an MW 7.8 earthquake occurred on the southwestern part of the East Anatolian Fault zone (EAF), followed by an MW 7.5 at ~100 km away on the East-West striking Sürgü fault 9 hours later. The W-Phase inversions indicate major strike-slip with dip angles of 60° for both events. A notable difference in seismic waveforms between two major earthquakes suggests different rupture characteristics. High-frequency back projection images for the MW 7.8 event from the dense broadband ChinArray shows a NE unilateral rupture from the onset for 40 sec with the expansion to the EAF trace since ~20 s and stopping at the junction of EAF and Sürgü fault, along with some late radiation at ~40-60 s to SW at the Amanos segment of EAF. The back projection image for the MW 7.5 event shows a main high-frequency coherent energy release for the first 10 sec over ~40 km and late weak radiations to the west near the curved Cardak fault and to the east near the Malatya fault. Preliminary slip models inverted from teleseismic data indicate a complex rupture for the MW 7.8 event predominantly on the EAF and a localized slip for the MW 7.5 event. The difference also exhibits in body-wave magnitude with mB=7.5 for the MW 7.5 and mB=7.2 for the MW 7.8 events. We are exploring InSAR images, hr-GNSS, and strong-motion data to constrain details in the rupture process of both events.