Supershear triggering and cascading fault ruptures of the 2023 Kahramanmaraş, Türkiye, earthquake doublet

• 成果类型: Article
• 署名作者: Ren, Chunmei; Wang, Zexin; Taymaz, Tuncay; Hu, Nan; Luo, Heng; Zhao, Zeyan; Yue, Han; Song, Xiaodong; Shen, Zhengkang; Xu, Haoyu; Geng, Jianghui; Zhang, Wei; Wang, Teng; Ge, Zengxi; Irmak, T. Serkan; Erman, Ceyhun; Zhou, Yijian; Li, Zhen; Xu, Hang; Cao, Bonan; Ding, Hongyang
• 署名单位: Peking University; Istanbul Technical University; Southern University of Science & Technology; Peking University; University of California System; University of California Los Angeles; Wuhan University; Kocaeli University; University of California System; University of California Riverside
• 刊物名称: SCIENCE
• ISSN/ISSBN: 0036-11021
• DOI: 10.1126/science.adi1519
• 发表日期: 2024-01-19
• 页码: 305-311
• 关键词: north anatolian fault; surface rupture; ground-motion; inversion; segmentation; deformation; valley; turkey

摘要

On 6 February 2023, two large earthquakes (moment magnitude 7.8 and 7.6) shocked a vast area of southeastern Turkiye and northern Syria, leading to heavy casualties and economic loss. To investigate the rupture process over multiple fault segments, we performed a comprehensive analysis of local seismic and geodetic data and determined supershear ruptures on the initial branch and the Pazarcik and Erkenek segments and subshear ruptures on the Amanos segment of event 1. The bilateral rupture of event 2 also presents distinct sub- and supershear velocities. The dynamic stress of the branch fault rupture triggered the Pazarcik segment initial rupture at a point 9 kilometers west of the junction of these two faults, boosting the supershear rupture of the Pazarcik segment of the main fault. The geometry and prestress level of multiple segments controlled the rupture behaviors and influenced the ground shaking intensity.