Bridging fault kinematics before, during, and after the 2022 Menyuan earthquake

IF 4.8 1区地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS

Earth and Planetary Science Letters Pub Date : 2025-06-19 DOI:10.1016/j.epsl.2025.119510

Rumeng Guo , Wenting Zhang , Xiongwei Tang , Kun Dai , Yu Li , Dechuan Liu , Yong Zheng , Shiyu Zeng , Jiangcun Zhou , Jianqiao Xu , Heping Sun

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引用次数: 0

Abstract

Decoding both surface deformation and underlying fault kinematics is of great significance for understanding earthquake physics and assessing seismic hazards. Herein, we compile the interseismic, coseismic, and postseismic InSAR deformation from 2014 to 2022 associated with the 2022 Ms 6.9 Menyuan earthquake and decipher the underlying creeping rate, seismic rupture, and stress-driven afterslip. Our results show that the dynamic rupture of the Menyuan event is precluded on the west by a creeping section and on the east by a highly locked section, which may be a stress barrier with high seismic potential. Its coseismic slip is mainly distributed within the high-coupling patch, and the afterslip occurred dominantly downdip of the coseismic asperity, an area also characterized by interseismic creeping, in line with the slip pattern predicted by the rate-and-state frictional framework. Afterslip and aftershocks are concentrated in regions of positive Coulomb failure stress changes (ΔCFS) due to the coseismic slip, and the increased ΔCFS is released >70 % aseismically and <30 % seismically by aftershocks. Finally, we introduce a conceptual model for this seismogenic fault to describe fault behaviors as well as frictional properties during the earthquake cycle. This study contributes valuable insights into the slip evolution, slip budget, and frictional behaviors of continental strike-slip fault systems.

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2022年门源地震前、中、后的桥接断层运动学

解码地表形变和下伏断层运动学对于理解地震物理和评估地震危险性具有重要意义。在此，我们编制了与2022年门源6.9级地震相关的2014 - 2022年的震间、同震和震后InSAR变形，并破译了潜在的蠕变速率、地震破裂和应力驱动的余震。结果表明，门源事件的动力破裂在西侧为爬行段，东侧为高锁断段，可能是具有高地震潜力的应力障壁。其同震滑动主要分布在高耦合地块内，后滑主要发生在同震陡坡的下倾区域，且具有震间蠕变特征，符合速率-状态摩擦框架预测的滑动模式。余震和余震集中在同震滑动引起的库仑破坏应力正变化区域（ΔCFS），增加的ΔCFS在地震和地震作用下分别释放70%和30%。最后，我们引入了这个发震断层的概念模型来描述地震周期中断层的行为和摩擦特性。该研究对大陆走滑断裂系统的滑动演化、滑动收支和摩擦行为具有重要意义。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Earth and Planetary Science Letters 地学-地球化学与地球物理

CiteScore

10.30

自引率

5.70%

发文量

475

审稿时长

2.8 months

期刊介绍： Earth and Planetary Science Letters (EPSL) is a leading journal for researchers across the entire Earth and planetary sciences community. It publishes concise, exciting, high-impact articles ("Letters") of broad interest. Its focus is on physical and chemical processes, the evolution and general properties of the Earth and planets - from their deep interiors to their atmospheres. EPSL also includes a Frontiers section, featuring invited high-profile synthesis articles by leading experts on timely topics to bring cutting-edge research to the wider community.