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

2019 Fiscal Year Annual Research Report

• Project/Area Number: 17F17718
• Research Institution: Japan Agency for Marine-Earth Science and Technology
• Principal Investigator: 山田 泰広 国立研究開発法人海洋研究開発機構, 研究プラットフォーム運用開発部門, 室長代理 (20362444)
• Co-Investigator(Kenkyū-buntansha): CHEN ZHIHAO 国立研究開発法人海洋研究開発機構, 研究プラットフォーム運用開発部門, 外国人特別研究員
• Project Period (FY): 2017-07-26 – 2020-03-31
• Keywords: analog model / ridge subduction

Outline of Annual Research Achievements

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.

Research Progress Status

令和元年度が最終年度であるため、記入しない。

Strategy for Future Research Activity

令和元年度が最終年度であるため、記入しない。