Elucidation of the Structure and Evolution of the Subduction Zone Using an Integrated Approach of High-Pressure Experiments and Seismic Wave Observations

• Project/Area Number: 23K25970
• Project/Area Number (Other): 23H01274 (2023)
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Multi-year Fund (2024); Single-year Grants (2023)
• Section: 一般
• Review Section: Basic Section 17040:Solid earth sciences-related
• Research Institution: Ehime University
• Principal Investigator: GREAUX Steeve 愛媛大学, 地球深部ダイナミクス研究センター, 助教 (90543166)
• Co-Investigator(Kenkyū-buntansha): 柿澤 翔 公益財団法人高輝度光科学研究センター, 回折・散乱推進室, テニュアトラック研究員 (10846819) ; 河合 研志 東京大学, 大学院理学系研究科(理学部), 准教授 (20432007)
• Project Period (FY): 2023-04-01 – 2028-03-31
• Project Status: Granted (Fiscal Year 2024)
• Budget Amount: ¥18,720,000 (Direct Cost: ¥14,400,000、Indirect Cost: ¥4,320,000); Fiscal Year 2027: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000); Fiscal Year 2026: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000); Fiscal Year 2025: ¥3,510,000 (Direct Cost: ¥2,700,000、Indirect Cost: ¥810,000); Fiscal Year 2024: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000); Fiscal Year 2023: ¥6,890,000 (Direct Cost: ¥5,300,000、Indirect Cost: ¥1,590,000)
• Keywords: mantle composition / high pressure / ultrasonic measurement / seismological model / waveform inversion

Outline of Research at the Start

The current research project aims at resolving seismic structures in the Earth's mantle transition zone, on the basis of in situ P- and S-wave elastic wave velocity and synchrotron X-ray measurements on inhomogeneous rocks under high pressure, "waveform inversion method" and numerical simulations.