嘉黎断裂带易贡-察隅段第四纪活动性特征

doi:10.3799/dqkx.2025.065

嘉黎断裂带易贡-察隅段第四纪活动性特征

doi: 10.3799/dqkx.2025.065

陆诗铭¹,
吴中海^1,2, ,,
韩帅^1,2,
胡渊^1,3,
凡福新^1,4

1. 中国地质科学院地质力学研究所, 北京 100081;
2. 自然资源部活动构造与地质安全重点实验室, 北京 100081;
3. 中国地质大学(北京)地球科学与资源学院, 北京 100083;
4. 中国地质大学(武汉)地球科学学院, 湖北武汉 430074

基金项目:

中国地质调查局项目《全国重大工程地质安全风险区划与综合评价》（DD20221816），断层运动状态与活动性参数厘定（2021YFB2301401-01），国家自然科学基金项目藏南亚东-谷露裂谷的晚第四纪分段变形行为与大地震复发特性研究（42472287）

详细信息

作者简介:
陆诗铭（1996-），女，博士研究生，研究方向为青藏高原活动构造.E-mail:lushiming0901@163.com

通讯作者:
吴中海（1974-），男，研究员，研究方向为新构造与活动构造.E-mail:wuzhonghai8848@foxmail.com

中图分类号: P546
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出版历程
- 收稿日期: 2025-02-05
- 网络出版日期: 2025-04-25

Quaternary Activity Characteristics of the Yi ong-Zayu Segment of the Jiali Fault Zone

Lu Shiming¹,
Wu Zhonghai^{1,2
, ,},
Han Shuai^1,2,
Hu Yuan^1,3,
Fan Fuxin^1,4

1. Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China;
2. Key Laboratory of Active Tectonics and Geological Safety, Ministry of Natural Resources, Beijing, 100081, China;
3. School of Earth and Resources, China University of Geosciences, Beijing, 100083, China;
4. Faculty of Earth Sciences, China University of Geosciences, Wuhan, 430074, Hubei

摘要

摘要: 嘉黎断裂带是青藏高原东南缘的重要活动构造之一，其构造活动特征对区域地震地貌演化具有重要意义。本文结合高分辨率遥感影像、DEM数据、地表调查及震源机制解等数据，系统分析了嘉黎断裂带易贡-察隅段的构造活动性。研究表明，嘉黎断裂带第四纪以来活动性较弱，未见显著走滑特征，仅在局部段落发育北西及近东西向正断层活动，地震主要表现为局部正断型地震。GPS速率分析显示断裂带现今活动性较低且变形主要以伸展为主，难以承担边界断裂的作用。综合前人资料，进一步推断局部正断层的形成主要受到局部剪切或者冰后回弹的影响且藏东南运动学模式更符合深部通道流驱动下的围绕东构造结顺时针旋转-挤出模式。
- 嘉黎断裂带 /
- 青藏高原 /
- 构造地貌 /
- 正断层 /
- 顺时针旋转-挤出模式
Abstract: The Jiali Fault Zone is one of the major active tectonic structures along the southeastern margin of the Tibetan Plateau, playing a crucial role in regional seismicity and geomorphic evolution. This study systematically analyzes the tectonic activity of the Yigong-Chayu segment of the Jiali Fault Zone by integrating high-resolution remote sensing imagery, DEM data, field investigations, and focal mechanism solutions.The results indicate that the Jiali Fault Zone has exhibited weak tectonic activity since the Quaternary, with no significant evidence of right-lateral strike-slip motion. Instead, localized NW- and nearly E-W-trending normal faulting has been observed along certain segments, and seismic activity is predominantly characterized by local normal-faulting earthquakes. GPS velocity analysis reveals that the fault exhibits low horizontal slip rates, with deformation primarily characterized by extension, suggesting that it does not function as a major boundary fault. By integrating previous studies, we further infer that the formation of local normal faults is primarily influenced by localized shear stress or post-glacial rebound. Moreover, the kinematic model of southeastern Tibet is more consistent with a clockwise rotational extrusion mechanism.
- Jiali Fault Zone /
- Tibetan Plateau /
- Tectonic Geomorphology /
- Normal Fault /
- Clockwise Rotational Extrusion Model

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