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Study of lunar internal structure by combining geophysical observation and thermochemical constraints

Research Project

Project/Area Number 17K05643
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Solid earth and planetary physics
Research InstitutionNational Astronomical Observatory of Japan

Principal Investigator

Matsumoto Koji  国立天文台, RISE月惑星探査プロジェクト, 准教授 (30332167)

Project Period (FY) 2017-04-01 – 2021-03-31
Project Status Completed (Fiscal Year 2020)
Budget Amount *help
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2019: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2018: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2017: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Keywords月内部構造 / 月マントル組成 / 潮汐加熱 / マントル組成
Outline of Final Research Achievements

We developed a formulation to calculate density and elastic modulus of the lunar mantle from composition and temperature as parameters. Based on Markov Chain Monte Carlo method we constructed lunar internal structure models that are consistent with both the latest geodetic observation data and Apollo seismic travel time data. The results suggest the existence of at least a two-layered chemical composition of the lunar mantle. If low-velocity and low-viscosity layer is composed of Ti-rich basalt, a mechanism is required to keep this layer hotter than the overlying mantle layer for which candidate is tidal heating.

Academic Significance and Societal Importance of the Research Achievements

内部構造は、月や惑星の起源・進化を考える上で非常に重要な情報であるが、身近な天体である月でさえ観測が限られており、内部構造の不確定性はまだ大きい。本研究では、月についてアポロ時代の月震データと最新の測地データに熱化学的制約を加えることにより、マントル部分の組成を含む月内部構造モデルを構築した。温度の仮定は残るものの、マントルの化学的な成層構造や月深部の潮汐加熱を示唆する結果が得られた。この手法は将来新たな観測データ得られた際の内部構造解析にも適用できると考えられる。

Report

(5 results)
  • 2020 Annual Research Report   Final Research Report ( PDF )
  • 2019 Research-status Report
  • 2018 Research-status Report
  • 2017 Research-status Report
  • Research Products

    (10 results)

All 2018 Other

All Int'l Joint Research (8 results) Journal Article (1 results) (of which Int'l Joint Research: 1 results,  Open Access: 1 results) Presentation (1 results) (of which Int'l Joint Research: 1 results)

  • [Int'l Joint Research] ベルナツキー地球化学・分析化学研究所 (GEOKHI RAS)(ロシア連邦)

    • Related Report
      2020 Annual Research Report
  • [Int'l Joint Research] 澳門科技大学太空科学研究所(中国)

    • Related Report
      2020 Annual Research Report
  • [Int'l Joint Research] ベルナツキー地球化学・分析化 学研究所(GEOKHI RAS)(ロシア連邦)

    • Related Report
      2019 Research-status Report
  • [Int'l Joint Research] 澳門科技大学太空科学研究所(中国)

    • Related Report
      2019 Research-status Report
  • [Int'l Joint Research] ベルナツキー地球化学・分析化 学研究所(GEOKHI RAS)(ロシア連邦)

    • Related Report
      2018 Research-status Report
  • [Int'l Joint Research] 澳門科技大学太空科学研究所(中国)

    • Related Report
      2018 Research-status Report
  • [Int'l Joint Research] ベルナツキー地球化学・分析化学研究所(GEOKHI RAS)(ロシア連邦)

    • Related Report
      2017 Research-status Report
  • [Int'l Joint Research] 澳門科技大学太空科学研究所(マカオ)

    • Related Report
      2017 Research-status Report
  • [Journal Article] Joint inversion of geophysical (seismic and selenodetic) and geochemical data for internal structure and composition of the Moon2018

    • Author(s)
      E. Kronrod, K. Matsumoto, O. Kuskov, V. Kronrod, R. Yamada, and S. Kamata
    • Journal Title

      IOP Conf. Series: Materials Science and Engineering

      Volume: 468 Pages: 012015-012015

    • DOI

      10.1088/1757-899x/468/1/012015

    • Related Report
      2018 Research-status Report
    • Open Access / Int'l Joint Research
  • [Presentation] Adjustment of geophysical and geochemical models of the Moon2018

    • Author(s)
      E. Kronrod, K. Matsumoto, O. Kuskov, V. Kronrod, R. Yamada, and S. Kamata
    • Organizer
      The 49th Lunar and Planetary Science Conference
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research

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Published: 2017-04-28   Modified: 2022-02-22  

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