| 基于粒子群算法的俯冲带三维有效弹性厚度反演 |
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| 引用本文： | 张江阳,孙珍,邱宁,张云帆,李付成.基于粒子群算法的俯冲带三维有效弹性厚度反演[J].地球物理学报,2019,62(12):4738-4749. |
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| 作者姓名： | 张江阳 孙珍 邱宁 张云帆 李付成 |
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| 作者单位： | 1. 中国科学院南海海洋研究所, 中国科学院边缘海与大洋地质重点实验室, 广州 510301;2. 中国科学院海洋研究所海洋地质与环境重点实验室, 青岛 266071;3. 中国科学院大学, 北京 100049 |
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| 基金项目： | 广东省自然科学基金研究团队（2017A030312002），中国科学院王宽诚率先人才计划"卢嘉锡国际团队项目"（GJTD-2018-13），国家自然科学基金项目（41606073，41576068），自然资源部海底矿产资源重点实验（KLMMR-2018-B-09）和中国博士后科学基金项目（2019M663119）联合资助. |
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| 摘 要： | 岩石圈有效弹性厚度是表征岩石圈力学性质的参数,其反映了岩石圈挠曲变形的特征.本文在传统二维挠曲模型的基础上,提出了适用于俯冲及碰撞带的三维薄板挠曲模型.并发展了基于粒子群算法的俯冲带三维有效弹性厚度反演方法.该方法适用于挠曲参数存在横向差异的俯冲-碰撞带.最后利用该方法反演了马尼拉海沟处岩石圈的有效弹性厚度,结果显示:南海中央海盆岩石圈的有效弹性厚度随着距洋中脊距离的增加而增大;马尼拉海沟轴部弯矩在洋中脊两侧呈分段性变化,这表明南海俯冲板片在深部撕裂可能对浅部的挠曲形态产生影响.
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| 关 键 词： | 挠曲 三维模拟 粒子群算法 南海 马尼拉海沟 |
| 收稿时间： | 2018-09-05 |
3-D effective elastic thickness inversion of subduction zone based on particle swarm optimization algorithm |
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| ZHANG JiangYang,SUN Zhen,QIU Ning,ZHANG YunFan,LI FuCheng.3-D effective elastic thickness inversion of subduction zone based on particle swarm optimization algorithm[J].Chinese Journal of Geophysics,2019,62(12):4738-4749. |
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| Authors: | ZHANG JiangYang SUN Zhen QIU Ning ZHANG YunFan LI FuCheng |
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| Institution: | 1. Key Laboratory of Ocean and Marginal Sea Geology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China;2. Key Laboratory of Marine Geology and Environment, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China;3. University of Chinese Academy of Sciences, Beijing 100049, China |
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| Abstract: | The effective elastic thickness of the lithosphere is a parameter that represents the mechanical properties of the lithosphere. It reflects the characteristics of the lithospheric flexural deformation. Based on the traditional two dimensional flexural modelling, a 3-D thin plate deflection model suitable for subduction and collision zone is proposed. A 3-D effective elastic thickness inversion method based on particle swarm optimization algorithm is developed. The method is applicable to subduction collision zones with lateral differences in flexural parameters. Finally, the effective elastic thickness of the lithosphere at the Manila trench is inverted by this method. The results show that the effective elastic thickness of the lithosphere in the Central Sea basin of the South China Sea increases with the distance from the middle ridge of the ocean, and the axial bending moment of the Manila trench is piecewise on both sides of the middle ocean ridge, which indicates that the tearing of the subduction plate of the South China Sea in deep may affect the flexural shape of the shallow part. |
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| Keywords: | Flexure 3-D modelling Particle swarm optimization algorithm South China Sea Manila trench |
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