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Reevaluation of lunar internal structure with reanalysis of deep moonquakes

Research Project

Project/Area Number 04835014
Research Category

Grant-in-Aid for General Scientific Research (C)

Allocation TypeSingle-year Grants
Research Field 惑星科学
Research InstitutionThe Institute of Space and Astronautical Science

Principal Investigator

MIZUTANI Hitoshi  ISAS Div.Planetary Science, Prof., 惑星研究系, 教授 (00011578)

Co-Investigator(Kenkyū-buntansha) HAYAKAWA Mashiko  ISAI Div.Planetary Science, Assistant, 惑星研究系, 助手 (40228557)
FUJIMURA Akio  ISAI Div.Div.Planetary Science, Ass.Prof., 惑星研究系, 助教授 (70173458)
Project Period (FY) 1992 – 1993
Project Status Completed (Fiscal Year 1993)
Budget Amount *help
¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 1993: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1992: ¥1,500,000 (Direct Cost: ¥1,500,000)
KeywordsLunar Seismology / Apollo Project / Lunar Internal Structure / Data Base / Seismic Processing / Planetary Science / Moonquake / Deep moonquake / 月食 / ペネトレータ / 月のコア / 走時曲線 / スタッキング
Research Abstract

We first analyzed the deep moonquakes from A1 and A33 sources using the stacking techniques in order to obtain new information of lunar internal structure. By stacking many wave forms from an identical seismic source, we could enhance significantly S/N ratio. In the stacked seismograms, we found some significant later phases that include the phate to be identified to be PKP or PKKP core phases. If these later phases are really core phses, it indicates that the lunar core size is approximately 450 km in radius. Since implication of existence of the core phase is so large, we decieded to confirm the existence of core phase in other seismograms. In order to continue this line of research, it is more important and more efficient to construct the data base of the lunar seismograms, because the present Apollo data set is very time-consuming to retrieve and analyze. In order to process many seismograms, it seems essential to construct user-friendly efficient data base of moonquake. This is also true for the data to be obtained during the LUNAR-A mission. Therefore we redirected this research to construct a new moonquake data base. We determined the framework of the data base and implemented. The data base will be widely opened to interested researchers, because this data base is the only source of lunar internal structure. After completion of the data base, we will continue to search for the later phases of deep moonquakes.

Report

(3 results)
  • 1993 Annual Research Report   Final Research Report Summary
  • 1992 Annual Research Report
  • Research Products

    (22 results)

All Other

All Publications (22 results)

  • [Publications] H.Mizutani: "Scaling law on impact Phenomena" Primitive Solar nebula and Origin of Planets(ed.Ooya). 297-317 (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] M.Hayakawa and H.Mizutani: "Numerical simulation of Planetary growth" Primitive Solar nebula and Origin of Planets(ed.Ooya). 319-340 (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] H.Araki,J.Terazono and H.Mizutani: "Re-analysis of Apollo SP seismic data" Proc.26th ISAS Lunar Planetary Symp.26. 76-79 (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] H.Murakami,T.Inoue and H.Mizutani: "Data compression for LUNAR-A" Proc.26th ISAS Lunar Planetary Symp.26. 72-75 (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] R.Honda,H.Mizutani and T.Yamamoto: "Core formation due to the dissipative heating" Proc.26th ISAS Lunar Planetary Symp.26. 209-212 (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Mizutani, H.: "Scaling law of impact phenomena" In : Primitimive Solar Nebula and Origin of Planets (edited by H.Ooya) Terra Scientific Pub.297-317 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Hayakawa, H., and Mizutani, H.: "Numerical simulation of planetary growth" In : Primitimive Solar Nebula and Origin of Planets (edited by H.Ooya), Terra Scientific Pub.319-340 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Araki, H., Terazono, J., and Mizutani, H.: "Re-analysis of Apollo SP seismic data" Proc.26th ISAS Lunar and Planetaary Symp.26. 76-79 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Murakami, H., T.Inoue, and Mizutani, H.: "Data compression for LUNAR-A" Proc.26th ISAS Lunar and Planetaary Symp.26. 72-75 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Honda, R., Mizutani, H., and Yamamoto, T.: "Core formation due to the dissipative heating" Proc.26th ISAS Lunar and Planetaary Symp.26. 209-212 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] H.Mizutani: "Scaling law on impact phenomena" Primitive Solar Nebula and Origin of Planets (ed.Ooya). 297-317 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] M.Hayakawa and H.Mizutani: "Numerical simulation of planetary growth" Primitive Solar Nebula and Origin of Planets (ed.Ooya). 319-340 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] H.Araki,J.Terazona and H.Mizutani: "Re-analysis of Apollo SP seismic data" Proc.26th ISAS Lunar Planetary Symp.26. 76-79 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] H.Murakami,T.Inoue and H.Mizutan.: "Data compression for LUNAR-A" Proc.26th ISAS Lunar Planetary Symp.26. 72-75 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] R.Honda,H.Mizutani and T.Yamamoto: "Core formation due to the dissipative neating" Proc.26th ISAS Lunar Planetary Symp.26. 209-212 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] 磯部珠三他(水谷を含め8名): "いつ起こる小惑星大衝突" 講談社, 192 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] H.Mizutani,M.Kohno A.Fujimura,J.Kawaguchi S.Nakajima,M.Hinada: "Lunau penetrator mission,Lunar-A" Proc.18th Int.Symp.Space Tech.18. 1717-1721 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] H.Mizutani,T.Yamamoto,A.Fujimura: "A new scaling law of the planetary magnetic fields." Adv.Space Res.12. 265-279 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] H.Mizutani: "Japan sets out to the Moon and Mars" The Planetary Repory. 22. 12-13 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] 藤村 彰夫,早川 雅彦: "LUNARー月計画ーわが国初めての惑星探査としての月ミッション" 日本惑星科学会誌. 1. 2-9 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] R.Honda,T.Yamamoto H.Mizutani: "Numerical simulation of the Earth's core formation" J.Geophys.Res.(Red). 98. (1993)

    • Related Report
      1992 Annual Research Report
  • [Publications] M.Abe,H.Mizutani Y.Tamura,M.Ooe: "Effects of the continental drift on the fidal friction and Earth's rofation" Proc.24th ISAS Lunar Planet.Symp. 24. 225-231 (1992)

    • Related Report
      1992 Annual Research Report

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Published: 1992-04-01   Modified: 2016-04-21  

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