| 乌鲁木齐地区现今构造应力场综合分析 |
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| 引用本文： | 李莹甄,沈军,聂晓红,龙海英.乌鲁木齐地区现今构造应力场综合分析[J].地震学报,2011,33(1):15-27. |
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| 作者姓名： | 李莹甄 沈军 聂晓红 龙海英 |
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| 作者单位： | （中国乌鲁木齐830011新疆维吾尔自治区地震局） |
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| 基金项目： | 国家“973”项目(2008CB425703); 乌鲁木齐城市活断层探测项目(2004-1138)联合资助 |
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| 摘 要： | 乌鲁木齐地处天山中段.震源机制解研究表明,北天山中段区域主压应力方向为N10°E左右,且具有自西向东逐渐东偏的特点.在乌鲁木齐地区,由中强地震震源机制解反演的主压应力方向为N15°-20°E;由断层滑动资料反演的乌鲁木齐周边构造应力场的主压应力方向为N17°W-N2°E.上述两种资料反演的乌鲁木齐构造应力场主压应力方向...
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| 关 键 词： | 乌鲁木齐 构造应力场 震源机制解 综合断层面解 原地应力测量 |
Comprehensive analysis on present tectonic stress field in Urumqi region |
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| Li Yingzhen,Shen Jun,Nie Xiaohong,Long Haiying.Comprehensive analysis on present tectonic stress field in Urumqi region[J].Acta Seismologica Sinica,2011,33(1):15-27. |
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| Authors: | Li Yingzhen Shen Jun Nie Xiaohong Long Haiying |
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| Institution: | （Xinjiang Earthquake Administration, Urumqi 830011, China） |
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| Abstract: | Urumqi city is located in central part of northern piedmont of Tianshan mountain. The mean direction of principal compressive stress in central section of northern Tianshan deduced from the focal mechanism solutions is around N10deg;E, with a clear feature of gradual change from west to east. In the region of Urumqi city, the direction derived from focal mechanism solutions of moderate-strong earthquakes is N15deg;mdash;20deg;E.The principal stress direction found from fault striation inversion is N17deg;Wmdash;N2deg;E. The stress direction deduced from the above two data sets are basically in the variation range of the principal compressive stress in the central section of northern Tianshan. However, the stress direction inferred from composite fault-plane solutions of small earthquakes within 25 km of the Urumqi seismic station is N40deg;mdash;46deg;E, which shows a deviation of 20deg;mdash;30deg;from that of regional principal compressive stress. Nevertheless, the direction of maximum horizontal compressive stress measured in the boreholes in Urumqi city is around N55deg;E, which displays a further deviation of 10deg;mdash;15deg;, and its deviation from that of regional stress field is up to 30deg;mdash;40deg;. These phenomena indicate that a tension stress in the shallow layers in front part of the compressive fault-fold region has been superposed to the regional NNE-SSW trending compressive tectonic stress and makes the direction of local principal compressive stress turn to NEE-SWW. This is one of the causes why the normal faults, such as the Jiujiawan fault groups, were developed in Urumqi city. |
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| Keywords: | Urumqi tectonic stress field focal mechanism solution composite fault-plane solution in-situ stress measurement |
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