Guo Rumeng, Tang Xiongwei, Zhang Yijun, Zhang Wenting, Qin Ming, Xu Jianqiao, Zhou Jiangcun, Zou Xuhao, Sun Heping
State Key Laboratory of Precision Geodesy, Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences, Wuhan, China.
Hubei Luojia Laboratory, Wuhan, China.
Nat Commun. 2025 Jan 22;16(1):959. doi: 10.1038/s41467-025-56350-7.
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.
地震滑动与非地震滑动之间的相互作用有助于揭示断层的摩擦特性和地震潜力。记录良好的2023年卡赫拉曼马拉什地震双震型提供了一个绝佳机会，来了解走滑断层上它们的划分情况。在此，我们利用合成孔径雷达干涉测量（InSAR）和强震数据，来推导双震型期间的同震破裂、约4个月的震后余滑，以及两次震级大于6.0的余震的滑动分布。我们的结果表明，余滑似乎与同震滑动和余震互补，占同震矩的约11.3%。余震主要落在由余滑引起的正库仑应力区域内，并且遵循与余滑相似的时间衰减规律，这表明余震的产生是由余滑加载的小凹凸体的破坏。震后早期余滑约93.7%以非地震方式释放，约6.3%通过余震以地震方式释放。因此，我们的模拟结果描绘了一个具有高度可变滑动模式和应力的复杂断层系统。
