东北亚地区地壳密度结构与垂向构造应力场

王振宇, 佘雅文, 付广裕, 皮誉洋. 2018. 东北亚地区地壳密度结构与垂向构造应力场. 地球物理学报, 61(6): 2280-2291, doi: 10.6038/cjg2018L0209
引用本文: 王振宇, 佘雅文, 付广裕, 皮誉洋. 2018. 东北亚地区地壳密度结构与垂向构造应力场. 地球物理学报, 61(6): 2280-2291, doi: 10.6038/cjg2018L0209
WANG ZhenYu, SHE YaWen, FU GuangYu, PI YuYang. 2018. Density structures of crust and vertical tectonic stress field of lithosphere in Northeast Asia. Chinese Journal of Geophysics (in Chinese), 61(6): 2280-2291, doi: 10.6038/cjg2018L0209
Citation: WANG ZhenYu, SHE YaWen, FU GuangYu, PI YuYang. 2018. Density structures of crust and vertical tectonic stress field of lithosphere in Northeast Asia. Chinese Journal of Geophysics (in Chinese), 61(6): 2280-2291, doi: 10.6038/cjg2018L0209

东北亚地区地壳密度结构与垂向构造应力场

  • 基金项目:

    国家自然科学基金(41574071),国家国际科技合作专项(2105DFR21100),地震预测研究所基本科研业务费专项(2016IES010204)与河北省地震局地震科技星火计划项目(DZ20170510054)联合资助

详细信息
    作者简介:

    王振宇, 男, 硕士研究生, 主要从事重力观测与解释研究.E-mail:15116181259@163.com

    通讯作者: 付广裕, 男, 博士, 研究员, 主要从事地震位错与重力均衡研究.E-mail:fugy@cea-ies.ac.cn
  • 中图分类号: P542

Density structures of crust and vertical tectonic stress field of lithosphere in Northeast Asia

More Information
  • 本文利用EIGEN-6C4重力数据和ETOPO1地形数据,在考虑物质密度横向不均匀的情况下,在东北亚地区展开地壳均衡研究,并重点分析了长白山的隆升机制.首先,针对穿越长白山和库页岛的两条近乎东西向的剖面(剖面A、B)展开详细研究,以CRUST1.0模型为初始条件,利用布格重力异常数据,基于Airy模型和Airy-Pratt模型分别反演了相应剖面的地壳密度结构,发现两剖面的地壳密度呈现一定程度的横向不均匀特性;接着基于上述密度结构和高程数据,利用Airy均衡理论计算了相应剖面的均衡面深度,并进一步比较莫霍面(Moho)和均衡面的差异,计算了剖面的垂向构造应力分布;然后,把上述方法应用到整个东北亚地区,计算了1°采样的21条东西向剖面的垂向构造应力,插值得到整个东北亚地区的垂向构造应力分布.结果表明,东北亚大部分地区垂向构造应力基本为零,总体处于均衡状态,长白山地区垂向构造应力为-15~-25 MPa,日本列岛垂向构造应力为-40~-50 MPa,太平洋海沟垂向构造应力为15~25 MPa;最后,本文运用自由空气重力异常导纳方法,计算了长白山地区的有效弹性厚度(Te)和加载比,发现长白山地区的Te为10 km,表明该地区的岩石圈较为柔软;加载比结果显示,岩石圈初始加载主要来自莫霍面,占总加载的78%,表明长白山的隆升主要源自地幔物质上涌.

  • 加载中
  • 图 1 

    东北亚地区地形图

    Figure 1. 

    Topography of Northeast Asia

    图 4 

    剖面A重力异常与地壳分层结构反演结果

    Figure 4. 

    Gravity anomalies and inversed layered structures of crust along profile A

    图 5 

    剖面B的重力异常与地壳分层结构反演结果

    Figure 5. 

    The gravity anomalies and inversed layered structures of crust along profile B

    图 2 

    东北亚地区布格重力异常分布图

    Figure 2. 

    Distribution of Bouguer gravity anomalies in Northeast Asia

    图 3 

    不同模型正演结果对比

    Figure 3. 

    Comparison of the forward results of the 2 models

    图 6 

    (a) 剖面A垂向构造应力示意图.红线表示垂向构造应力,红色箭头表示应力方向,灰色区域表示陆地,蓝色区域表示海洋;(b)剖面A均衡面和莫霍面深度对比,蓝线表示均衡面,紫线表示莫霍面

    Figure 6. 

    (a) Vertical tectonic stress of profile A. Red line denotes vertical tectonic stress. Red vectors denote direction of the stress. Gray area denotes land. Blue area denotes sea; (b) Comparison between the depth of the isostasy with the Moho along profile A. Blue line denotes the depth of the isostasy. Violet line denotes the Moho

    图 7 

    剖面B的垂向构造应力和均衡面和莫霍面深度对比

    Figure 7. 

    The vertical tectonic stress and comparison between the depth of isostasy with the Moho along profile B

    图 8 

    东北亚地区莫霍面深度反演结果

    Figure 8. 

    The inversed depth of the Moho of the Northeast Asia

    图 9 

    东北亚地区垂向构造应力分布

    Figure 9. 

    Distribution of the vertical tectonic stress in Northeast Asia

    图 10 

    自由空气导纳方法计算结果

    Figure 10. 

    Results calculated by free air admittance method

    表 1 

    反演用主要参数初值

    Table 1. 

    Initial value of main parameters for inversion

    沉积层
    下界面深度
    (km)
    上地壳
    下界面深度
    (km)
    中地壳
    下界面深度
    (km)
    下地壳
    下界面深度
    (km)
    沉积层密度
    (g·cm-3)
    上地壳密度
    (g·cm-3)
    中地壳密度
    (g·cm-3)
    下地壳密度
    (g·cm-3)
    地幔密度
    (g·cm-3)
    剖面A 2.032 8.958 16.997 25.433 2.00 2.72 2.83 2.99 3.25
    剖面B 0.717 12.220 23.548 34.000 2.09 2.71 2.80 2.97 3.32
    下载: 导出CSV

    表 2 

    莫霍面深度计算结果与前人研究结果对比

    Table 2. 

    Comparison between depths of Moho calculated in this paper and former studies

    区域 反演
    结果
    (km)
    前人
    结果
    (km)
    数据来源 使用方法
    松辽平原 33 31 33 Tao et al., 2014 Zheng et al., 2011 H-κ网格搜索
    背景噪声层析成像
    长白山 35 35 38 Tao et al., 2014 Zheng et al., 2011 H-κ网格搜索背景噪声层析成像
    日本海盆 12
    北海道和
    本州交界
    23 24 Zheng et al., 2011 背景噪声层析成像
    兴安岭群南部 38 38 37 Tao et al., 2014 Zheng et al., 2011 H-κ网格搜索
    背景噪声层析成像
    三江平原 35 35 Tao et al., 2014 H-κ网格搜索
    锡霍特山 37
    日本海北部 30
    下载: 导出CSV
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出版历程
收稿日期:  2017-04-09
修回日期:  2017-09-30
上线日期:  2018-06-05

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