Slip-weakening distance and energy partitioning estimated from near-fault recordings during the 2023 Mw 7.8 Türkiye-Syria earthquake

He, Zhongqiu1; Zhang, Zhenguo1,2; Wang, Zijia1; Wang, Wenqiang1

2024-08-22

10.1016/j.tecto.2024.230424

TECTONOPHYSICS   影响因子和分区

0040-1951

1879-3266

Fault-weakening process governs the earthquake rupture dynamics and energy partitioning and is of great importance for understanding earthquake physics and seismic hazards. The 2023 Mw 7.8 T & uuml;rkiye-Syria earthquake was well recorded by dense strong motion stations near ruptured faults, providing a rare opportunity to explore parameters controlling the fault-weakening behavior. This work investigates the Dc' value as a proxy of the slip-weakening distance, defined as double the fault-parallel displacement at the time of peak ground velocity. The Dc' values are directly estimated from observations of near-fault stations whose final displacements are carefully corrected from original acceleration recordings and validated by coseismic horizontal displacements from geodetic techniques. Our results show that estimated Dc' values ranging from 0.9 m to 2.4 m are spatially variable and generally follow the scaling relationship of Dc' versus the final slip, consistent with previous observations. We also analyze the earthquake energy budget based on a well-constrained finite-fault model. The results reveal that the radiation efficiency of the event is relatively low and may not favor the sustained generation of supershear rupture. These results provide important insights into heterogeneous frictional properties on natural faults and implications for seismic hazard assessment.

Slip-weakening distance 2023 T & uuml rkiye-Syria earthquake Earthquake energy budget Fracture energy Rupture dynamics

SCI ; EI

英语

第一 ; 通讯

National Natural Science Foundation of China[42174057] ; High Level Special Funds[G03050K001] ; Guangdong Provincial Key Laboratory of Geophysical High-resolution Imaging Technology[2022B1212010002]

Geochemistry & Geophysics

Geochemistry & Geophysics

WOS:001275688700001

ELSEVIER

20243016743250

Acceleration ; Budget control ; Hazards ; Seismic response

Seismology:484 ; Secondary Earthquake Effects:484.2 ; Accidents and Accident Prevention:914.1

GEOSCIENCES

Web of Science

1.Southern Univ Sci & Technol, Dept Earth & Space Sci, Shenzhen, Peoples R China
2.Southern Univ Sci & Technol, Guangdong Prov Key Lab Geophys High resolut Imagin, Shenzhen, Peoples R China

He, Zhongqiu,Zhang, Zhenguo,Wang, Zijia,et al. Slip-weakening distance and energy partitioning estimated from near-fault recordings during the 2023 Mw 7.8 Türkiye-Syria earthquake[J]. TECTONOPHYSICS,2024,885.

He, Zhongqiu,Zhang, Zhenguo,Wang, Zijia,&Wang, Wenqiang.(2024).Slip-weakening distance and energy partitioning estimated from near-fault recordings during the 2023 Mw 7.8 Türkiye-Syria earthquake.TECTONOPHYSICS,885.

He, Zhongqiu,et al."Slip-weakening distance and energy partitioning estimated from near-fault recordings during the 2023 Mw 7.8 Türkiye-Syria earthquake".TECTONOPHYSICS 885(2024).