2022 Fiscal Year Annual Research Report
高圧実験と地震波観測による統合的アプローチを用いた沈み込み帯下の構造と進化の解明
| Project/Area Number |
19H02002
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| Research Institution | Ehime University |
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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)
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| Co-Investigator(Kenkyū-buntansha) |
肥後 祐司 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, 主幹研究員 (10423435)
河合 研志 東京大学, 大学院理学系研究科(理学部), 准教授 (20432007)
佐藤 友彦 岡山理科大学, 基盤教育センター, 准教授 (80714831)
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| Project Period (FY) |
2019-04-01 – 2023-03-31
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| Keywords | mantle composition / high pressure / ultrasonic measurement / seismological model / triplication |
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| Outline of Annual Research Achievements |
P- and S-wave elastic velocities are unique tools we have to explore the chemical composition and structures of the inaccessible deep Earth, by comparing high pressure mineral physics data with seismological observations. In this research project, we proposed to elucidate locally the seismicity of regions of stagnating slabs, independently from global models, on the basis of laboratory sound velocity measurements, geological record of the slab and local seismological observations.
In this FY, we further developed ultrasonic interferometry and synchrotron X-ray techniques in the multi-anvil press at the beamline BL04B1 in SPring-8, allowing experiments at the pressures and temperatures of the uppermost lower mantle (exp. at P~ 25-31 GPa and T up to 2100 K). The improved techniques were applied to investigate the sound velocities of Mid-Ocean Ridge Basalt (MORB) and harzburgite rock aggregates accordingly to the original plan, but also to the Al-rich Fe-bearing Bridgmanite, the major mineral of the Earth's lower mantle. The elastic wave velocity models derived from our study, are readily available for comparison with global seismic models while methods to compare with local seismic models by waveform inversion methods are still underway.
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| Research Progress Status |
令和4年度が最終年度であるため、記入しない。
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| Strategy for Future Research Activity |
令和4年度が最終年度であるため、記入しない。
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[Presentation] Low Velocity Zones in the Martian Upper Mantle Highlighted by Sound Velocity Measurements2022
Author(s)
Xu F., Siersch N., Greaux S., Rivoldini A., Kuwahara H., Kondo N., Wehr N., Menguy N., Kono Y., Higo Y., Plesa A.-C., Badro J. and Antonangeli D.
Organizer
23rd General Meeting of the International Mineralogical Association, IMA 2022
Int'l Joint Research
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