| 青藏高原西部及邻区构造应力场反演和断层滑动趋势分析 |
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| 引用本文： | 杨 颖,解朝娣,徐 彦,相传芳,刘本玉.青藏高原西部及邻区构造应力场反演和断层滑动趋势分析[J].大地测量与地球动力学,2022,42(7):694-699. |
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| 作者姓名： | 杨 颖 解朝娣 徐 彦 相传芳 刘本玉 |
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| 摘 要： | 基于Global CMT提供的1976-01-01~2015-12-31期间1 255个MW≥3.5地震的震源机制解，利用FMSI方法对青藏高原西部及邻区（新疆西部地区）应力场进行反演，得到区域应力场特征，并分析西昆仑断裂带及阿尔金断裂带的断层滑动趋势。结果表明，青藏高原西部及邻区的最大主压应力轴σ1整体呈NNE-SSW向，自西向东顺时针旋转；最小主压应力轴σ3整体呈NWW-SEE向。最大主压应力轴σ1倾角大小约为5°~9°，说明该地区的构造应力场以水平运动为主。西昆仑断裂带及阿尔金断裂带具有较强的滑动趋势（Ts≥0.5），说明西昆仑断裂带及阿尔金断裂带未来失稳滑动的可能性较大。
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| 关 键 词： | 青藏高原西部及邻区 震源机制解 FMSI方法 应力场反演 断层滑动趋势分析 |
Inversion of Tectonic Stress Field and Fault Slip Tendency Analysis in Western Tibetan Plateau and Adjacent Areas |
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| YANG Ying,XIE Zhaodi,XU Yan,XIANG Chuanfang,LIU Benyu.Inversion of Tectonic Stress Field and Fault Slip Tendency Analysis in Western Tibetan Plateau and Adjacent Areas[J].Journal of Geodesy and Geodynamics,2022,42(7):694-699. |
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| Authors: | YANG Ying XIE Zhaodi XU Yan XIANG Chuanfang LIU Benyu |
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| Abstract: | Based on 1 255 seismic source mechanism solutions of MW≥3.5 during 1976-01-01~2015-12-31 provided by Global CMT, we use the FMSI method to invert the stress field in the western Qinghai-Tibet plateau and its adjacent areas (western Xinjiang). We analyze the trend of fault sliding in the west Kunlun fault zone and Altyn Tagh fault zone. The results show that the maximum principal compressive stress axis σ1 in the western Tibetan plateau and neighboring areas is in the NNE-SSW direction and rotates clockwise from west to east; the minimum principal compressive stress axis σ3 is in the NWW-SEE direction. The dip of the maximum principal compressive stress axis σ1 is about 5°~9°, indicating that the tectonic stress field in this area is dominated by horizontal motion. The west Kunlun fault zone and Altyn Tagh fault zone have a strong sliding trend (Ts≥0.5), indicating that the possibility of future destabilization and sliding of the west Kunlun fault zone and Altyn Tagh fault zone is larger. |
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| Keywords: | western part of the Tibetan plateau and its adjacent areas focal mechanism solution FMSI method inversion of stress field fault slip tendency analysis |
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