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    基于EIGEN-6C2重力场模型反演青藏高原地壳结构

    郭东美 鲍李峰 许厚泽

    郭东美, 鲍李峰, 许厚泽, 2015. 基于EIGEN-6C2重力场模型反演青藏高原地壳结构. 地球科学, 40(10): 1643-1652. doi: 10.3799/dqkx.2015.148
    引用本文: 郭东美, 鲍李峰, 许厚泽, 2015. 基于EIGEN-6C2重力场模型反演青藏高原地壳结构. 地球科学, 40(10): 1643-1652. doi: 10.3799/dqkx.2015.148
    Guo Dongmei, Bao Lifeng, Xu Houze, 2015. Tectonic Characteristics of the Tibetan Plateau Based on EIGEN-6C2 Gravity Field Model. Earth Science, 40(10): 1643-1652. doi: 10.3799/dqkx.2015.148
    Citation: Guo Dongmei, Bao Lifeng, Xu Houze, 2015. Tectonic Characteristics of the Tibetan Plateau Based on EIGEN-6C2 Gravity Field Model. Earth Science, 40(10): 1643-1652. doi: 10.3799/dqkx.2015.148

    基于EIGEN-6C2重力场模型反演青藏高原地壳结构

    doi: 10.3799/dqkx.2015.148
    基金项目: 

    湖北省自然科学基金 2014CFB171

    青年人才启动经费 Y306784079

    国家自然科学基金 41504012

    详细信息
      作者简介:

      郭东美(1983-), 女, 博士, 主要从事重力资料处理及重力反演的相关研究.E-mail: guodongmei@whigg.ac.cn

    • 中图分类号: P312.1

    Tectonic Characteristics of the Tibetan Plateau Based on EIGEN-6C2 Gravity Field Model

    • 摘要: 重力数据是地下场源产生的重力场的叠加, 包含了地下从浅部到深部的丰富信息.高阶卫星资料的丰富为青藏高原深部构造研究提供了重要资料.基于EIGEN-6C2模型作为原始数据, 首先对青藏高原布格重力异常和均衡重力异常分别作1~5阶尺度分解, 得到不同尺度重力异常的分布特性, 探讨不同空间尺度反映的地壳构造意义.其次, 基于径向对数功率谱估计平均深度方法理论, 进一步研究1~5阶细节反映的场源深度.再次, 利用Canny算子的多尺度边缘检测识别和分析重力异常中表现不明显的断裂, 定位断裂在地表的位置, 识别青藏高原内部断块边界, 完成活动块体和次级块体的划分.最后, 对布格重力异常进行沉积层及岩石圈改正, 采用Parker-Oldenbarg三维位场反演法反演青藏高原莫霍界面起伏.

       

    • 图  1  青藏高原EIGEN-6C2自由空间重力异常

      单位:10-5 m/s2;间隔:100×10-5 m/s2

      Fig.  1.  EIGEN-6C2:spatial gravity anomaly of Tibet plateau

      图  2  青藏高原布格重力异常示意

      单位:10-5 m/s2

      Fig.  2.  Bouguer gravity field of Tibet plateau

      图  3  青藏高原EIGEN-6C2均衡重力异常

      单位:10-5 m/s2

      Fig.  3.  Isostatic gravity field of Tibet plateau

      图  4  青藏高原布格重力异常一维多尺度分解的细节图

      a.1阶细节图;b.2阶细节图;c.3阶细节图;d.4阶细节图;e.5阶细节图

      Fig.  4.  Details of Bouguer gravity anomaly using 1D dimensional multi-scale analysis

      图  5  青藏高原均衡重力异常一维多尺度分解的细节图

      a.1阶细节图;b.2阶细节图;c.3阶细节图;d.4阶细节图;e.5阶细节图

      Fig.  5.  Details of isostatic gravity anomaly using 1D dimensional multi-scale analysis

      图  6  布格重力异常多尺度分解细节经对数功率谱估计的场源深度(P为功率)

      a.1阶细节估计结果;b.2阶细节估计结果;c.3阶细节估计结果;d.4阶细节估计结果;e.5阶细节估计结果

      Fig.  6.  Sources depths calculated by power spectral analysis using multi-scale analysis details of Bouguer gravity anomaly

      图  7  均衡重力异常多尺度分解细节经对数功率谱估计的场源深度(P为功率)

      a.1阶细节估计结果;b.2阶细节估计结果;c.3阶细节估计结果;d.4阶细节估计结果;e.5阶细节估计结果

      Fig.  7.  Sources depths calculated by power spectral analysis using multi-scale analysis details of isostatic gravity anomaly

      图  8  基于Canny算子的边缘检测法识别断裂及块体边界

      a.10′×10′;b.20′×20′;c.50′×50′;d.大地构造线

      Fig.  8.  Determine the fracture and block boundary based on edge detection based on canny operator

      图  9  EIGEN-6C2重力场反演的莫霍面深度(单位:km)

      Fig.  9.  The Moho depths inversed by EIGEN-6C2 gravity field

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    • 收稿日期:  2014-12-31
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