Dynamic Rupture Process of the 2023 Mw 7.8 Kahramanmaraş Earthquake (SE Türkiye): Variable Rupture Speed and Implications for Seismic Hazard

Wang，Zijia1,2; Zhang，Wenqiang3; Taymaz，Tuncay4; He，Zhongqiu1; Xu，Tianhong1; Zhang，Zhenguo1,2

2023-08-16

10.1029/2023GL104787

Geophysical Research Letters   Impact Factor & Quartile

0094-8276

1944-8007

We considered various non-uniformities such as branch faults, rotation of stress field directions, and changes in tectonic environments to simulate the dynamic rupture process of the 6 February 2023 Mw 7.8 Kahramanmaraş earthquake in SE Türkiye. We utilized near-fault waveform data, GNSS static displacements, and surface rupture to constrain the dynamic model. The results indicate that the high initial stress accumulated in the Kahramanmaraş-Çelikhan seismic gap leads to the successful triggering of the East Anatolian Fault (EAF) and the supershear rupture in the northeast segment. Due to the complexity of fault geometry, the rupture speed along the southeastern segment of the EAF varied repeatedly between supershear and subshear, which contributed to the unexpectedly strong ground motion. Furthermore, the triggering of the EAF reminds us to be aware of the risk of seismic gaps on major faults being triggered by secondary faults, which is crucial to prevent significant disasters.

2023 Mw 7.8 Kahramanmaraş earthquake earthquake rupture dynamics transient supershear rupture

SCI

English

NI Journal Papers

First ; Corresponding

National Natural Science Foundation of China[42174057];

Geology

Geosciences, Multidisciplinary

WOS:001041916000001

AMER GEOPHYSICAL UNION

GEOSCIENCES

2-s2.0-85166738091

Scopus

1.Department of Earth and Space Sciences,Southern University of Science and Technology,Shenzhen,China
2.Guangdong Provincial Key Laboratory of Geophysical High-resolution Imaging Technology,Southern University of Science and Technology,Shenzhen,China
3.Department of Earth and Planetary Sciences,McGill University,Montreal,Canada
4.Department of Geophysical Engineering,The Faculty of Mines,Istanbul Technical University,Sarıyer, Istanbul,Turkey

Wang，Zijia,Zhang，Wenqiang,Taymaz，Tuncay,et al. Dynamic Rupture Process of the 2023 Mw 7.8 Kahramanmaraş Earthquake (SE Türkiye): Variable Rupture Speed and Implications for Seismic Hazard[J]. Geophysical Research Letters,2023,50(15).

Wang，Zijia,Zhang，Wenqiang,Taymaz，Tuncay,He，Zhongqiu,Xu，Tianhong,&Zhang，Zhenguo.(2023).Dynamic Rupture Process of the 2023 Mw 7.8 Kahramanmaraş Earthquake (SE Türkiye): Variable Rupture Speed and Implications for Seismic Hazard.Geophysical Research Letters,50(15).

Wang，Zijia,et al."Dynamic Rupture Process of the 2023 Mw 7.8 Kahramanmaraş Earthquake (SE Türkiye): Variable Rupture Speed and Implications for Seismic Hazard".Geophysical Research Letters 50.15(2023).