Seismic versus aseismic slip for the 2023 Kahramanmaraş earthquake doublet

Rumeng Guo (), Xiongwei Tang, Yijun Zhang, Wenting Zhang, Ming Qin, Jianqiao Xu, Jiangcun Zhou, Xuhao Zou and Heping Sun
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Rumeng Guo: Chinese Academy of Sciences
Xiongwei Tang: Chinese Academy of Sciences
Yijun Zhang: Chinese Academy of Sciences
Wenting Zhang: Chinese Academy of Sciences
Ming Qin: Chinese Academy of Sciences
Jianqiao Xu: Chinese Academy of Sciences
Jiangcun Zhou: Chinese Academy of Sciences
Xuhao Zou: China University of Geosciences
Heping Sun: Chinese Academy of Sciences

Nature Communications, 2025, vol. 16, issue 1, 1-13

Abstract: Abstract Interplay between seismic and aseismic slip could shed light on the frictional properties and seismic potential of faults. The well-recorded 2023 Kahramanmaraş earthquake doublet provides an excellent opportunity to understand their partitioning on strike-slip faults. Here, we utilize InSAR and strong motion data to derive the coseismic rupture during the doublet, ~4-month postseismic afterslip, and slip distributions of two Mw>6.0 aftershocks. Our results show that afterslip appears to be complementary to coseismic slip and aftershocks, accounting for ~11.3% of the coseismic moment. Aftershocks mainly fall within the regions of positive Coulomb stresses caused by afterslip and follow a temporal decay similar to that of afterslip, indicating that aftershock production is the failure of small asperities loaded by the afterslip. The early postseismic afterslip is released ~93.7% aseismically and ~6.3% seismically by aftershocks. Our modeling results thus depict a complex fault system with highly variable slip patterns and stresses.

Date: 2025
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DOI: 10.1038/s41467-025-56350-7

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