俯冲带库仑楔形体力学

胡岩. 2022. 俯冲带库仑楔形体力学. 地球物理学报, 65(2): 417-426, doi: 10.6038/cjg2022P0894
引用本文: 胡岩. 2022. 俯冲带库仑楔形体力学. 地球物理学报, 65(2): 417-426, doi: 10.6038/cjg2022P0894
HU Yan. 2022. Coulomb subduction zone wedge mechanics. Chinese Journal of Geophysics (in Chinese), 65(2): 417-426, doi: 10.6038/cjg2022P0894
Citation: HU Yan. 2022. Coulomb subduction zone wedge mechanics. Chinese Journal of Geophysics (in Chinese), 65(2): 417-426, doi: 10.6038/cjg2022P0894

俯冲带库仑楔形体力学

  • 基金项目:

    科技部重点研发项目(2018YFC504103)和国家自然科学基金委员会面上项目(41774109)共同资助

详细信息
    作者简介:

    胡岩, 男, 1976年生, 研究员, 研究方向为岩石圈动力学和大地测量.E-mail: yanhu11@ustc.edu.cn

  • 中图分类号: P541

Coulomb subduction zone wedge mechanics

  • 楔形体理论研究楔形体在底部摩擦力、重力和边界外力共同作用下内部的应力状态,有助于我们定量分析断层强度和岩石性质与楔形体稳定状态之间的关系.本文首先简要介绍基于不同楔形体材料而得出的应力解析解.然后介绍基于理想弹塑性材料的俯冲带库仑楔应力解析解.最后介绍基于该解析解而提出的动态库仑楔形体理论.俯冲带地震反射剖面数据表明,弧前靠近海沟部分地表坡度比较陡,其内部经历复杂永久塑性变形(称为外部楔形体,outer wedge).而靠近内陆部分地表坡度比较平缓,反射剖面显示沉积层呈水平规则分布,常伴随沉积盆地(称为内部楔形体,inner wedge).动态库仑楔形体理论认为弧前这种地表形态和内部构造特征的不同,可能反映了断层面摩擦性质的差异性.内部楔形体对应于断层面上的生震带,在地震周期可能主要经历弹性变形.而外部楔形体对应于断层面上的无震蠕滑部分,在地震发生时可能产生塑性破坏、永久变形.

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  • 图 1 

    楔形体应力解析解和海沟增生楔地震反射剖面[(a) 修改自Yin and Kelty(2000)图 3.(b)来自Hu and Wang (2006)图 1b.(c)来自Wang and Hu (2006)图 2a]

    Figure 1. 

    Analytical stress solutions in the wedge and a seismic reflection profile in an accretionary prism [(a) Modified from Fig. 3 in Yin and Kelty (2000). (b) From Fig. 1b in Hu and Wang (2006). (c) From Fig. 2a in Wang and Hu (2006)]

    图 2 

    临界破裂状态下楔形体应力摩尔圆

    Figure 2. 

    Mohr circle of a critical wedge on the verge of failure

    图 3 

    楔形体内部应力状态随底部有效摩擦系数变化图[修改自Wang and Hu(2006)图 7]

    Figure 3. 

    Stress status in a wedge with a varying basal effective frictional coefficient [Modified from Fig. 7 in Wang and Hu (2006)]

    图 4 

    (a) 大坝和(b)三角形悬臂梁受力示意图

    Figure 4. 

    Illustration of the stress status in (a) a dam and (b) a triangle-shaped hanging beam

    图 5 

    外部和内部楔形体地震周期应力演化[(a)修改自Wang and Hu(2006)图 9a.(b)修改自Wang and Hu (2006)图 11a]

    Figure 5. 

    Earthquake-cycle stress evolution in an outer wedge and an inner wedge [(a) Modified from Fig. 9a in Wang and Hu (2006). (b) Modified from Fig. 11a in Wang and Hu (2006)]

    图 6 

    弧前外部和内部楔形体地震周期应力演化[修改自Wang and Hu (2006)图 12]

    Figure 6. 

    The earthquake-cycle stress evolution of the outer and inner wedge in a forearc [Modified from Fig. 12 in Wang and Hu (2006)]

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收稿日期:  2021-11-30
修回日期:  2022-01-11
上线日期:  2022-02-10

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