海嶺沈み込みによる地球深部構造への影響と大陸衝突による地震分布への影響

海脊俯冲对地球深层结构的影响及大陆碰撞对地震分布的影响

• 批准号: 17F17718
• 负责人: 山田 泰広
• 金额: $ 1.41万
• 依托单位: Japan Agency for Marine-Earth Science and Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for JSPS Fellows
• 财政年份: 2017
• 资助国家: 日本
• 起止时间: 2017-07-26 至 2020-03-31
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-17F17718/
• 关键词: analog model; ridge subduction; Analogue experiment; plate subduction; continental collision; model; experiment; subduction; tectonics

The main purpose of this research is to understand the partitioning and distribution of seismicity in relation to subducting ridges during continental collision with modification of previous numerical modelling.During the funding period, the experimental data has been processed and finished. The results regarding the influence of the presence of an overriding plate and an interplate rheology on trench retreat and subduction dynamics, has been submitted to an international journal and is still on-going. Our investigation on the India-Asia collision process and its associated extensive intraplate deformation in East Asia, based on our innovative analogue modelling, has been summarized and submitted to an international journal. The result suggests that the collision and subduction should be synchronous and interacted to explain the deformation. The result also demonstrated how large-scale Pacific slab rollback played a key role to produce the enigmatic east-west extension in Tibet, eastward continental extrusion and backarc basin formation along the East Asian margin.By visiting international research institutions including Chinese Universities (e.g., Southern University of Science and Technology and China University of Geoscience (Wuhan)), collaborations were established for further research.

本研究的主要目的是通过对以往数值模拟的修正，了解大陆碰撞过程中与俯冲海脊有关的地震活动的划分和分布。有关盖覆板的存在和板间流变性对海沟后退和俯冲动力学的影响的结果已提交给一家国际期刊，并仍在进行中。基于我们创新的模拟模型，我们对印度-亚洲碰撞过程及其相关的东亚大范围板内变形的研究已经总结并提交给一份国际期刊。结果表明，碰撞和俯冲应是同步的，相互作用才能解释形变。结果还表明，大规模的太平洋板块回滚对西藏神秘的东西延伸、向东的大陆挤压和东亚边缘弧后盆地的形成起到了关键作用。通过访问包括中国大学(如南方科技大学和中国地质大学(武汉))在内的国际研究机构，建立了进一步研究的合作关系。

项目成果

Topography of the Overriding Plate During Progressive Subduction: A Dynamic Model to Explain Forearc Subsidence

• DOI: 10.1002/2017gl074672
• 发表时间: 2017-10-16
• 期刊: GEOPHYSICAL RESEARCH LETTERS
• 影响因子: 5.2
• 作者: Chen, Zhihao;Schellart, Wouter P.;Strak, Vincent
• 通讯作者: Strak, Vincent