| 内蒙古阿巴嘎地区地壳方位各向异性研究 |
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| 引用本文： | 强正阳,吴庆举,何静,李永华.内蒙古阿巴嘎地区地壳方位各向异性研究[J].地球物理学报,2019,62(8):2946-2958. |
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| 作者姓名： | 强正阳 吴庆举 何静 李永华 |
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| 作者单位： | 1. 中国地震局地球物理研究所, 北京 100081;2. 中国地震局地震观测与地球物理成像重点实验室, 北京 100081;3. 中国地震局地壳应力研究所, 北京 100085 |
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| 基金项目： | 国家自然科学基金（41804084，41274088）和中国地震局地球物理研究所基本科研业务专项（DQJB18B14）联合资助. |
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| 摘 要： | 本文利用架设在内蒙古阿巴嘎地区38个宽频带地震台站记录到的远震数据，通过拟合P波接收函数径向Pms转换波到时和叠加不同方位切向分量，确定了地壳各向异性参数.结果表明，大部分台站Pms延迟时间在0.35 s左右；而少数台站时差较大，推测可能受到索伦缝合带附近地壳残留倾斜界面影响.各向异性快波方向变化范围在N95°E到N180°E之间，平均为N130.6°E±19.1°，推测中下地壳矿物在ENE-WSW向区域主压应力作用下发生晶格定向排列可能是导致地壳各向异性的主要成因.研究区壳幔变形特征和机制不同，属于解耦变形.
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| 关 键 词： | 阿巴嘎地区 地壳各向异性 接收函数 Pms震相 |
| 收稿时间： | 2019-01-26 |
Crustal azimuthal anisotropy beneath Abag area in Inner Mongolia,China |
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| QIANG ZhengYang,WU QingJu,HE Jing,LI YongHua.Crustal azimuthal anisotropy beneath Abag area in Inner Mongolia,China[J].Chinese Journal of Geophysics,2019,62(8):2946-2958. |
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| Authors: | QIANG ZhengYang WU QingJu HE Jing LI YongHua |
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| Institution: | 1. Institute of Geophysics, Chinese Earthquake Administration, Beijing 100081, China;2. Key laboratory of Seismic Observation and Geophysical Imaging, Institute of Geophysics, China Earthquake Administration, Beijing 100081, China;3. Institute of Crustal Dynamics, Earthquake Administration, Beijing 100085, China |
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| Abstract: | Utilizing the teleseismic data recorded by 38 broadband seismic stations located in the Abag area, the crustal anisotropy parameters are obtained by the radial Pms phase fitting and tangential component stacking of the P wave receiver functions. The results show that the delay time of most stations is about 0.35 s; while a few stations have larger-than-normal delay times, which is inferred to be affected by the residual inclined interfaces in the crust near the Solonker suture zone. The fast directions vary from N95°E to N180°E with an average value of N130.6°E±19.1°, inferred to be formed by lattice-preferred orientation of the middle and lower crust anisotropic minerals under regional stress. The deformation mechanism of the crust and mantle are different, and is decoupled. |
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| Keywords: | Abag area Crustal anisotropy Receiver functions Pms phase |
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