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ISSN 2096-7780 CN 10-1665/P

胡渊, 韩帅, 吴中海, 柏伟国. 霍尔巴-仓木错裂谷的断层构造与地表破裂特征[J]. 地震科学进展 . DOI: 10.19987/j.dzkxjz.2023-185
引用本文: 胡渊, 韩帅, 吴中海, 柏伟国. 霍尔巴-仓木错裂谷的断层构造与地表破裂特征[J]. 地震科学进展 . DOI: 10.19987/j.dzkxjz.2023-185
Hu Yuan, Han Shuai, Wu Zhonghai, 00 Weiguo. Huoerba-Cangmucuo rift valley structure and surface fracture characteristics[J]. Progress in Earthquake Sciences. DOI: 10.19987/j.dzkxjz.2023-185
Citation: Hu Yuan, Han Shuai, Wu Zhonghai, 00 Weiguo. Huoerba-Cangmucuo rift valley structure and surface fracture characteristics[J]. Progress in Earthquake Sciences. DOI: 10.19987/j.dzkxjz.2023-185

霍尔巴-仓木错裂谷的断层构造与地表破裂特征

Huoerba-Cangmucuo rift valley structure and surface fracture characteristics

  • 摘要: 霍尔巴-仓木错裂谷是藏南几大裂谷系之一,整体走向N20°E,全长约200 km,包含20个平行或斜列分布的次级断裂带和地堑-半地堑系。新近纪以来,裂谷中断层活动性强,地震频发,研究裂谷的活动与成因机制对理解青藏高原晚新生代的隆升过程和变形机制以及预防地质灾害具有重要意义。本文通过遥感影像解译的方法,对裂谷内主要正断层与同震地表破裂的发育和空间展布进行研究,综合地貌特征与现今地震数据,讨论其原因和变形机制。裂谷内集中分布近南北向正断层,整体呈现全新世活断层高密度发育的特点,断层发育程度由东向西递减,断裂数量与地表破裂密度自北向南递减。裂谷内最新地表破裂发育在隆格尔雪山东麓,错动全新世地貌,破裂分布密度与断层的空间展布和历史地震具有紧密联系。结合历史资料,裂谷北段雪山地堑区为地震空区,未来可能发生强震。

     

    Abstract: The Huoerba-Cangmucuo Rift is one of the major rift systems in southern Tibet, with a general strike of N20°E and a total length of about 200 km, containing 20 parallel or oblique secondary fault zones and graben-half graben systems. The active faults and frequent earthquakes of the rift valley since the Neogene play an important role in understanding the uplift process and deformation mechanism of the Tibetan Plateau in the late Cenozoic.. In this paper, the development characteristics and spatial distribution of major normal faults and surface fractures in rifts are studied by means of remote sensing image interpretation, and then discuss their formation causes and deformation mechanisms. The main features of this region are the concentrated distribution of near north-south normal faults, which show the characteristics of high-density development of active new layers as a whole. The development degree of faults in the rift valley shows a decreasing trend from east to west, and the number of faults and surface fractures decreases from north to south. The latest surface rupture in the rift valley developed at the eastern foot of the Lunggar Mountain, and the Holocene landform along the dislocation is closely related to the spatial distribution of the fault and the historical earthquake. Based on the analysis of historical data, it is found that there is an earthquake gap in the northern section of Rift , which may cause strong earthquakes in the future.

     

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