为了研究多个断层段的破裂过程，研究团队对当地地震和大地测量数据进行了综合分析，并确定了初始分支上的超剪切破裂和事件1Amanos段上的PazarcIk、Erkenek段以及亚剪切破裂。事件2的双侧破裂也表现出明显的亚剪切速度和超剪切速度。
分支断层破裂的动态应力在这两个断层交汇点以西9公里处引发了PazarcIk段的初始破裂，推动了主断层PazarcIk的超剪切破裂。多个节段的几何形状和预应力水平控制着断裂行为，并影响着地震动强度。
据了解，2023年2月6日，两次大地震(震级为7.8级和7.6级)震撼了叙利亚东南部和叙利亚北部的广大地区，造成重大人员伤亡和经济损失。
附：英文原文
Title: Supershear triggering and cascading fault ruptures of the 2023 Kahramanmaras, Türkiye, earthquake doublet
Author: Chunmei Ren, Zexin Wang, Tuncay Taymaz, Nan Hu, Heng Luo, Zeyan Zhao, Han Yue, Xiaodong Song, Zhengkang Shen, Haoyu Xu, Jianghui Geng, Wei Zhang, Teng Wang, Zengxi Ge, T. Serkan Irmak, Ceyhun Erman, Yijian Zhou, Zhen Li, Hang Xu, Bonan Cao, Hongyang Ding
Issue&Volume: 2024-01-19
Abstract: On 6 February 2023, two large earthquakes (moment magnitude 7.8 and 7.6) shocked a vast area of southeastern Türkiye 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 Pazarck 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 Pazarck segment of the main fault. The geometry and prestress level of multiple segments controlled the rupture behaviors and influenced the ground shaking intensity.
DOI: adi1519
Source: https://www.science.org/doi/10.1126/science.adi1519