The complex dynamics of the 2023 Kahramanmara, Turkey, Mw 7.8-7.7 earthquake doublet

• 成果类型: Article
• 署名作者: Jia, Zhe; Jin, Zeyu; Marchandon, Mathilde; Ulrich, Thomas; Gabriel, Alice-Agnes; Fan, Wenyuan; Shearer, Peter; Zou, Xiaoyu; Rekoske, John; Bulut, Fatih; Garagon, Asli; Fialko, Yuri
• 署名单位: University of California System; University of California San Diego; Scripps Institution of Oceanography; University of Munich; Bogazici University
• 刊物名称: SCIENCE
• ISSN/ISSBN: 0036-11676
• DOI: 10.1126/science.adi0685
• 发表日期: 2023-09-01
• 页码: 985-990
• 关键词: discontinuous galerkin method; east anatolian fault; 1999 hector mine; unstructured meshes; nepal earthquake; imperial-valley; rupture; inversion; california; stress

摘要

The destructive 2023 moment magnitude (M-w) 7.8-7.7 earthquake doublet ruptured multiple segments of the East Anatolian Fault system in Turkey. We integrated multiscale seismic and space-geodetic observations with multifault kinematic inversions and dynamic rupture modeling to unravel the events' complex rupture history and stress-mediated fault interactions. Our analysis reveals three subshear slip episodes during the initial M-w 7.8 earthquake with a delayed rupture initiation to the southwest. The M-w 7.7 event occurred 9 hours later with a larger slip and supershear rupture on its western branch. Mechanically consistent dynamic models accounting for fault interactions can explain the unexpected rupture paths and require a heterogeneous background stress. Our results highlight the importance of combining near- and far-field observations with data-driven and physics-based models for seismic hazard assessment.