| 鄂尔多斯块体西侧地壳各向异性初步研究 |
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| 引用本文： | 太龄雪,高原.鄂尔多斯块体西侧地壳各向异性初步研究[J].地震,2017,37(1):82-91. |
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| 作者姓名： | 太龄雪 高原 |
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| 作者单位： | 中国地震局地震预测研究所, 北京 100036 |
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| 基金项目： | 中国地震局地震预测研究所基本科研业务专项(2012IES010104)与国家自然科学基金(41474032)资助 |
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| 摘 要： | 利用宁夏区域台网记录的2009年1月至2014年9月的近场小震波形资料, 使用剪切波分裂系统分析方法SAM方法, 对位于青藏高原东北缘的鄂尔多斯块体西侧进行了地壳各向异性研究, 共得到7个台站记录到的19条有效数据。 研究发现, 受复杂的局部构造、 应力场及断裂分布的影响, 研究区地壳各向异性在空间分布上呈现出分区性特点。 受区域构造应力场的控制, 台站的快剪切波偏振方向与区域构造应力的主压应力方向基本一致。 在构造上, 大致以中部的三关口—牛首山NNW向断裂为界, 可以分为南北两部分。 本研究显示, 以快剪切波偏振方向空间分布特征为划分依据, 大致以37°N为界划分南北部, 北部区域的快剪切波偏振方向为近N-S向, 与按构造划分的青藏高原东北缘—鄂尔多斯块体西侧北部区域主压应力场一致; 南部区域的快剪切波偏振方向为近E-W向, 同样与按构造划分的区域主压应力场一致。
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| 关 键 词： | 快剪切波偏振方向 慢剪切波时间延迟 主压应力方向 鄂尔多斯块体西侧 |
| 收稿时间： | 2016-05-09 |
Preliminary Study of Crustal Anisotropy in the West of Ordos Block |
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| TAI Ling-xue,GAO Yuan.Preliminary Study of Crustal Anisotropy in the West of Ordos Block[J].Earthquake,2017,37(1):82-91. |
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| Authors: | TAI Ling-xue GAO Yuan |
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| Institution: | Institute of Earthquake science, CEA, Beijing 100036, China |
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| Abstract: | Using seismic data recorded by permanent stations in Ningxia province from January 2009 to September 2014, this study analyzed the crustal anisotropy in west of the Ordos block locating at northeastern margin of Tibetan Plateau by Systematic Analysis Method (SAM method) of shear-wave splitting, and obtained 19 available data from 7 stations. The results show that, influenced by the complicated local tectonics, stress field and a large number of faults, the spatial distribution of crustal anisotropy are different in west of the Ordos block. Owing to the regional tectonic stress field, the polarization directions of fast shear-wave at most stations are consistent with the regional tectonic compressive stress field. Moreover, the distribution of polarization directions varies in different regions. Structurally, the study region can be divided into north and south parts roughly by Sanguankou-Niushoushan fault at the middle of the region. According to the spatial distribution feature of the polarization directions, we divided the research region into north and south parts roughly bounded by 37°N. In the north part, the polarization directions are nearly N-S, consistent with the regional compressive stress field at the north of west of the Ordos block, divided by tectonics. In the south part, the polarization directions are nearly E-W, consistent with the regional compressive stress field at the south west of the Ordos block, also divided by teconics. |
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| Keywords: | Crustal anistropy Shear wave splitting Ordos block |
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