喜马拉雅东构造结及周边地区地壳各向异性特征

黄臣宇, 常利军, 丁志峰. 2021. 喜马拉雅东构造结及周边地区地壳各向异性特征. 地球物理学报, 64(11): 3970-3982, doi: 10.6038/cjg2021P0034
引用本文: 黄臣宇, 常利军, 丁志峰. 2021. 喜马拉雅东构造结及周边地区地壳各向异性特征. 地球物理学报, 64(11): 3970-3982, doi: 10.6038/cjg2021P0034
HUANG ChenYu, CHANG LiJun, DING ZhiFeng. 2021. Crustal anisotropy in the eastern Himalayan syntaxis and adjacent areas. Chinese Journal of Geophysics (in Chinese), 64(11): 3970-3982, doi: 10.6038/cjg2021P0034
Citation: HUANG ChenYu, CHANG LiJun, DING ZhiFeng. 2021. Crustal anisotropy in the eastern Himalayan syntaxis and adjacent areas. Chinese Journal of Geophysics (in Chinese), 64(11): 3970-3982, doi: 10.6038/cjg2021P0034

喜马拉雅东构造结及周边地区地壳各向异性特征

  • 基金项目:

    中国地震局地球物理研究所基本业务专项资助项目(DQJB19B30),国家自然科学基金资助项目(41774061,42074053)和第二次青藏高原综合科学考察研究(2019QZKK0701)联合资助

详细信息

Crustal anisotropy in the eastern Himalayan syntaxis and adjacent areas

  • 利用喜马拉雅东构造结及周边地区的48个宽频带地震台站记录的远震波形数据,通过Pms波分裂测量得到了295对地壳各向异性横波分裂参数,获得了研究区的地壳各向异性图像.喜马拉雅东构造结的快波偏振方向主要为NE-SW方向,周边地区的快波偏振方向呈现出绕东构造结顺时针旋转的趋势.Pms波分裂的慢波延迟时间范围为0.11~0.30 s,平均值为0.24 s.对比分析研究区内Pms波分裂、近震直达S波分裂和远震SKS波分裂的结果发现,上地壳各向异性对Pms波分裂影响有限,地壳各向异性主要来自于中下地壳矿物和熔体的定向排列;地壳各向异性对SKS波分裂影响较小,SKS波分裂主要反映了上地幔的各向异性特征;Pms波分裂的快波偏振方向与近震直达S波分裂和远震SKS波分裂的快波偏振方向表现出较好的一致性,并且与地表构造和变形特征具有较好的相关性,反映了喜马拉雅东构造结及周边地区的岩石圈变形可能为垂直连贯变形模式.

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  • 图 1 

    喜马拉雅东构造结地质简图

    Figure 1. 

    Geological map of the eastern Himalayan syntaxis

    图 2 

    DOJ台站下方P波接收函数

    Figure 2. 

    P-wave receiver functions under station DOJ

    图 3 

    地震事件震中分布图

    Figure 3. 

    The distribution map of the epicenters

    图 4 

    Pms波分裂各向异性参数测量示例

    Figure 4. 

    An example of the Pms wave splitting measurement

    图 5 

    喜马拉雅东构造结Pms波分裂各向异性结果

    Figure 5. 

    The results of the Pms wave splitting in the eastern Himalayan syntaxis

    图 6 

    各台站Pms波分裂结果随地震事件后方位角分布变化情况

    Figure 6. 

    The results of the Pms wave splitting with different back azimuths of seismic events in each station

    图 7 

    喜马拉雅东构造结各向异性综合分析图

    Figure 7. 

    Comprehensive analysis diagram of anisotropy in the eastern Himalayan syntaxis

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收稿日期:  2021-01-12
修回日期:  2021-05-11
上线日期:  2021-11-10

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