Numerical simulation of fault activity in the Qilian tectonic belt and dynamic background of Menyuan earthquake series

IF 2.1 3区 地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS Journal of Geodynamics Pub Date : 2024-05-24 DOI:10.1016/j.jog.2024.102034
Yuan Li , Xia Liu , Anfu Niu , Wei Zhan , Long Feng , Zheng Tang
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Abstract

Some faults in the Qilian tectonic belt are seismogenic areas for strong earthquakes, including the western section of the Lenglongling fault, which frequently occures moderate-strong Menyuan earthquakes. In this study, using GPS velocity data of 1991–2015 as the boundary constraints, a three-dimensional viscoelastic finite element dynamic model is constructed by comprehensively considering the regional dynamic environment, crust-mantle transverse-longitudinal inhomogeneity, and spatial spreading of a complex fault system. The objective is to investigate the long-period characteristics of fault movement and stress change in the Qilian tectonic belt caused by tectonic loading, and to discuss the seismogenic conditions of the Menyuan earthquakes. The results show that the annual change of long-period movement and stress of the major faults in the Qilian Mountain tectonic zone are characterized by significant segmentation. Due to its unique geometric bend morphology, the western section of Lenglongling fault has a low movement rate, significant slip deficit and high shear stress accumulation, which are conducive to the gestation and occurrence of earthquakes. Furthermore, the seismogenic area of the Menyuan earthquake series is jointly subjected to NE-SW compressive and NW-SE tensile stress fields, and the maximum shear stress and elastic strain energy accumulate faster than in the surrounding areas. Overall, the western section of the Lenglongling fault has a strong dynamic background and favorable conditions for the frequent occurrence of the Menyuan earthquake series.

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祁连构造带断层活动的数值模拟与门源地震系列的动力背景
祁连构造带上的一些断层是强震的发震区,其中冷龙岭断层西段经常发生门源中强地震。本研究以 1991-2015 年 GPS 速度数据为边界约束,综合考虑区域动力环境、地壳-地幔横纵不均匀性、复杂断层系统空间展布等因素,构建了三维粘弹性有限元动力模型。目的是研究构造荷载作用下祁连构造带断层运动和应力变化的长周期特征,探讨门源地震的成震条件。结果表明,祁连山构造带主要断层的长周期运动和应力年变化具有明显的分段特征。由于其独特的几何弯曲形态,冷龙岭断层西段具有运动速率低、滑动亏缺明显、剪应力积累大等特点,有利于地震的孕育和发生。此外,门源地震系列的发震区共同受到 NE-SW 压应力场和 NW-SE 拉应力场的作用,最大剪应力和弹性应变能量的积累速度比周边地区快。总体而言,冷龙岭断层西段具有较强的动力背景,是门源地震频发的有利条件。
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来源期刊
Journal of Geodynamics
Journal of Geodynamics 地学-地球化学与地球物理
CiteScore
4.60
自引率
0.00%
发文量
21
审稿时长
6-12 weeks
期刊介绍: The Journal of Geodynamics is an international and interdisciplinary forum for the publication of results and discussions of solid earth research in geodetic, geophysical, geological and geochemical geodynamics, with special emphasis on the large scale processes involved.
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