根据震源地震机制，乌兹别克斯坦境内地壳的当前应力

IF 0.8 Q4 GEOCHEMISTRY & GEOPHYSICS

Geodynamics & Tectonophysics Pub Date : 2021-09-17 DOI:10.5800/gt-2021-12-3-0532

T. L. Ibragimova, R. Ibragimov, M. Mirzaev, Y. Rebetsky

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引用次数: 5

摘要

利用包括许多作者提供的数据的震源地震机制目录，对乌兹别克斯坦境内地壳的当前应力进行了研究。应力重建是基于沿裂缝位移的碎裂分析。为了重建研究区几个地震活跃区的地壳不同深度的应力状态，我们考虑均匀样品的最小地震次数为6次，在单个域内的平均半径为10 ~ 30 km。确定了主应力轴的方位角和倾角、Lode - Nadai系数、应力模式的地球动力类型、最大剪应力相对值(与岩石强度归一化)和有效压力值。绘制了整个地震活跃层和深层地震活跃层的参数空间分布图。根据弱、中地震(М≤4.5)和强地震(М≥5.0)震源机制参数，在两个层次上重建应力场并进行比较。利用国际地震研究中心(IPE RAS)创建的互联网资源“欧亚大陆的构造应力”，将强震(М≥5.0)数据重建的应力场可视化。

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THE CURRENT STRESS OF EARTH'S CRUST IN THE TERRITORY OF UZBEKISTAN ACCORDING TO FOCAL EARTHQUAKE MECHANISMS

The current stress of Earth's crust in the territory of Uzbekistan has been studied using a focal earthquake mechanisms catalogue that includes the data provided by many authors. Stress reconstructions are based on the cataclastic analysis of displacements along fractures. For reconstructing the stress state at different depths of the crust in several seismically active regions of the study area, we consider a minimum number of earthquakes in a homogeneous sample equal to 6 and an averaging radius of 10 to 30 km within a single domain. The azimuths and dip angles of the principal stress axes, Lode – Nadai coefficients, geodynamic types of stress modes, relative (normalized to rock strength) values of maximum shear stresses, and effective pressure values are determined. Maps showing the spatial distribution of the studied parameters are constructed for both the entire seismically active layer and the depth layers. Stress fields are reconstructed and compared at two hierarchical levels based on the parameters of focal mechanisms of weak and moderate earthquakes (М≤4.5) and those of strong (М≥5.0) earthquakes. "Tectonic Stresses of Eurasia", the Internet resource created by IPE RAS, is used to visualize the stress field reconstructed from the data on strong (М≥5.0) earthquakes.

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来源期刊

Geodynamics & Tectonophysics GEOCHEMISTRY & GEOPHYSICS-

CiteScore

1.20

自引率

14.30%

发文量

审稿时长

24 weeks

期刊介绍： The purpose of the journal is facilitating awareness of the international scientific community of new data on geodynamics of continental lithosphere in a wide range of geolchronological data, as well as tectonophysics as an integral part of geodynamics, in which physico-mathematical and structural-geological concepts are applied to deal with topical problems of the evolution of structures and processes taking place simultaneously in the lithosphere. Complex geological and geophysical studies of the Earth tectonosphere have been significantly enhanced in the current decade across the world. As a result, a large number of publications are developed based on thorough analyses of paleo- and modern geodynamic processes with reference to results of properly substantiated physical experiments, field data and tectonophysical calculations. Comprehensive research of that type, followed by consolidation and generalization of research results and conclusions, conforms to the start-of-the-art of the Earth’s sciences.