| 兰州至玛曲地区地应力测量与现今构造应力场特征研究 |
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| 引用本文： | 吴满路,马寅生,张春山,廖椿庭,区明益.兰州至玛曲地区地应力测量与现今构造应力场特征研究[J].地球物理学报,2008,51(5):1468-1474. |
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| 作者姓名： | 吴满路 马寅生 张春山 廖椿庭 区明益 |
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| 作者单位： | 1.国土资源部新构造运动与地质灾害重点实验室;2.中国地质科学院地质力学研究所，北京 100081 |
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| 基金项目： | 中国地质调查局地质调查项目，中国地质科学院大调查预警工程项目，地质力学研究所基本科研业务费项目 |
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| 摘 要： | 兰州—玛曲地区是印度板块北东向推挤引起青藏块体强烈变形的前缘区，该区的现今构造应力场研究对研究大陆动力学问题具有重要意义.本文给出了兰州—玛曲地区不同地点的现今地应力实测值的大小和方向.测量方法采用压磁应力解除法，测点分别布置在阿姨山、大水、尕海、玛艾以及清水.为系统研究本区及邻近地区现今构造应力场特征，对已有应力实测数据进行了整理分析.研究结果表明，本区及邻区几十米浅表部应力与其他地区相比，属于中等大小量值；应力随深度增加而加大，但在不同构造单元，应力增加梯度有所不同；最大水平主应力方向总体上为北东向，不同构造单元上方向有所不同，鄂尔多斯地块最大水平主应力方向为近东西向，河西走廊带最大水平主应力方向在北北西—北东方向内变化，祁连山东南端最大水平主应力方向变化较大，西秦岭地块是现今地应力的一个过渡带，最大水平主应力方向由北侧的NE向逐渐转变为中部的EW向和南侧的SEE向.本文给出的结果与由GPS观测给出的该区域应变场分布具有一致性.
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| 关 键 词： | 兰州—玛曲地区 地应力测量 构造应力场 |
| 收稿时间： | 2007-7-27 |
| 修稿时间： | 2008-6-13 |
In-situ stress measurement and tectonic stress field study in the region of Lanzhou-Maqu |
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| WU Man-Lu,MA Yin-Sheng,ZHANG Chun-Shan,LIAO Chun-Ting,OU Ming-Yi.In-situ stress measurement and tectonic stress field study in the region of Lanzhou-Maqu[J].Chinese Journal of Geophysics,2008,51(5):1468-1474. |
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| Authors: | WU Man-Lu MA Yin-Sheng ZHANG Chun-Shan LIAO Chun-Ting OU Ming-Yi |
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| Institution: | 1.Rey Laboratory of Neotectonic Movement & Geohazard;2.Institute of Geomechanics, Chinese Academy of Geological Science, Beijing 100081, China |
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| Abstract: | The study region is a strongly deformed area of the east margin of the Tibet plateau due to the northeastward compression of Indian plate.A study on the recent state of stress in the plateau provides basic data for research of continental dynamics.The values and directions of the ground stress at several sites of Lanzhou-Maqu area are given in the paper using piezomagnetic stress gauge overcoring method.The measurement sites are situated in Ayishan,Dashui,Gahai,Ma'ai and Qingshui.The previous stress data are also analyzed for studying the tectonic stress field in the region of Lanzhou-Maqu and its adjacent area.It is shown that the values of ground stress in depths less than 100m are medium as compared to that in other areas,and increase with depth,the increase rate differs in different tectonic units.The overall direction of maximum principal stress is northeast with a small variation in different tectonic units.The direction of maximum principal stress is nearly west-east in Ordos block,NNW-NE in Hexizoulang.The changing of maximum principal stress direction is maximum in the southeast part of Qilanshan mountain.The west Qinling mountain is a transition zone of ground stress direction.The direction of maximum principal stress is changed gradually from NE in north to EW in middle part and SEE in south.The results agree with the results from GPS observation in this area. |
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| Keywords: | The region of Lanzhou-Maqu In-situ stress measurement Tectonic stress field |
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