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CONSTRUCTION OF GRAVITY DATA-BASE IN SOUTHWEST JAPAN

Research Project

Project/Area Number 07640552
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field 固体地球物理学
Research InstitutionNagoya University

Principal Investigator

SHICHI Ryuichi  Nagoya Univ.School Sci.Professor, 理学部, 教授 (50022596)

Co-Investigator(Kenkyū-buntansha) KOMURO Hiroaki  Shimane Univ.Faculty Sci.Eng.Professor, 総合理工学部, 教授 (80135897)
Project Period (FY) 1995 – 1997
Project Status Completed (Fiscal Year 1997)
Budget Amount *help
¥2,400,000 (Direct Cost: ¥2,400,000)
Fiscal Year 1997: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1996: ¥900,000 (Direct Cost: ¥900,000)
Fiscal Year 1995: ¥900,000 (Direct Cost: ¥900,000)
KeywordsSouthwest Japan / Gravity database / Vanishing the blank area / Dense gravity measurements / Total revision of data accuracy / Precise gravity anomaly map / Steep gravity gradient belt / Active fault / 制度改定 / データベース / 空白解消 / 重力急変帯 / 活断層 / 地質構造線
Research Abstract

The purpose of present project is to create a gravity database to cover all over the southwest Japan by developping the achievement of the former two projects of gravity study in the area (Grant-in Aid for Scientific Research (C), No.01540331,1989-1991 ; and Grant-in Aid for Scientific Research (C), No.04640400,1992-1994).
During the last three years of present project, Nagoya University and Shimane University made gravity measurements extensively and stored 13,517 and 2,795 points of new data, respectively. Through this work, large parts of the blank area still remaind in the southwest Japan that distributed in western Chugoku, Hokuriku, central Kyushu districts were vanished and changed to the area densely filled up with precise gravity data. Besides this, very dense gravity measurements were made at the areas tectoniccaly important such as (1) surrounding area of seismic sourse region of the 1995 southern Hyogo-Ken Earthquake, (2) Tokai district ranged from Yoro mountains to Ooigawa … More through Nobi Plain, (3) central Hokuriku district surrounding the Toyama Bay, and so on. On the other hand, we collected a large number of gravity data from more than 20 institutions and organizations, and performed total revision of accuracy on all of the collected data to keep a high precision. The gravity database thus we constructed containes now more than 11,1000 points of net data, and covers uniformly and very densely almost all southwest Japan, west of Fossa Magna. All of the gravity data are registered in the gravity database with very high precision of 1 magal or better.
By utilizing this high precision gravity database, we are able to draw precise gravity anomaly maps at any portion, in any scale size, as we wish. Form those, we can recognize following factors : 1) Distinct linearments are delineated along major geological tectonic lines, such as Median tectonic line, Akaishi tectonic line, Atera fault and so on. 2) Steep garvty gradient belts are deliniated very sharply along the major active faults and geological faults such as the Rokko fault system, the Yoro fault, the Isurugi fault, and so on. 3) A new geological fault ; Himi fault was found out from the densely measured gravity data. As the result of geological survey, it is considered to be not an active fault. 4) Many linearments deliniated only on the gravity maps are found out at anywhere. They are not known so far by other geophysical or geological means. Less

Report

(4 results)
  • 1997 Annual Research Report   Final Research Report Summary
  • 1996 Annual Research Report
  • 1995 Annual Research Report
  • Research Products

    (45 results)

All Other

All Publications (45 results)

  • [Publications] Shichi, R.(editor): "Report of the Geodetic Works in Japan,6. Determination of the Gravity Field" J.Geod.Soc.Japan. 41,No.3. 309-332 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] 志知 龍一: "1995年兵庫県南部地震震源域の重力異常" 月刊地球特集号. 13,. 129-134 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Kobayashi, S.: "Hidden fault scarp inferred from gravity analysis and disaster belt of the 1995 Hyogo-Ken Nanbu Earthquake" LAG Sympo.Vol.117,Spriger-Verlag. 328-335 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Nawa, K.: "Inversion of gravity data to determine the terrain density distribution in southwest Japan," J.Geophys.Res.Vol.102,No.B12,. 27,703-27,719 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Hagita, N.: "Himi fault revealed by gravity survey in the west of the Toyama Plain,central Japan" J.Earth Planet.Sci.Nagoya Univ.,. Vol.44,. 29-59 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] 小室 裕明: "重力異常からみた三瓶カルデラの基盤形態" 火山. 41,No.1. 1-10 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] 小室 裕明: "重力異常からみた大山-蒜山火山群の基盤形態" 火山,. 42,No.2,. 153-157 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] 志知 龍一: "島根県重力異常図(新編島根県地質図付図,20万分の1)" 島根県地質図編集委員会, 全2葉 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Shichi, R.(editor): "Report of the Geodetic Works in Japan, 6.Determination of the Gravity Field" J.Geod.Soc.Japan. 41, No.3. 309-332 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Kobayashi, S., R.Shichi, H.Nishinaka, H.Watanabe, and S.Onizawa: "Dense Gravity Survey in the Kirishima Volcanoes and its Surrouding Calderas, Southen Kyushu, Japan (in Japanese)" Bull.Earthq.Res.Inst, Univ.Tokyo. 70. 103-136 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Shichi, R., and H.Aoki: "Gravity Anomaly in and around the Seismic Source Area of the 1995 Southern Hyogo Prefecture Earthquake, Central Honshu, Japan (in Japanese)" Earth Monthly. 13. 129-134 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Shichi, R.: "Sensityvity Characteristics of LaCoste & Romberg Gravimeters (Model G) and Accuracy of Gravity Measurements (in Japanese)" Earth Monthly. 11. 44-49 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Nakagawa, I., R.Shichi, S.Nakai, K.Nakamura, T.Higashi, R.Li, Y.Chen, and D.Wang: "Japan-China Gravimetric Connection (III)-Sensityvity Characterstics and Measurement Accuracy of LaCoste & Romberg Gravimeters (Model G)(in Japanese)" J.Geod.Soc.Japan. 41. 171-195 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Kunitomo, T., and R.Shichi: "Basement Relief under Sanbe Caldera Inferred from Gravity Anomaly (in Japanese)" Zisin (J.Seismol.Soc.Japan). 48 No.4. 439-450 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Kobayashi, S., S.Yoshida, S.Okubo, R.Shichi, T.Shimamoto, and T.Kato: "Two-dimensional analysis of gravity anomaly across the Rokko fault system" J.Phys.Earth. 44. 357-372 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Kobayashi, S., R.Shichi, H.Nishinaka, H.Watanabe, and S.Onizawa: "Gravimetric Analysis of Subsurface Structure beneath the Kirishima Volcanoes and its Surrounding Calderas, Southern Kyushu, Japan (in Japanese)" Rpt.Grant-in Aid Sci.Res.No.3 (Princip.Invest. : Kushiro, I.). 85-94 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Segawa, J., C.S.Yang, R.Shichi, M.Satomura, and, C.Kuramoto: "Gravity Measurement" Prelim.Rept.Hakuho-Maru Cruise. KH-69-1. 17-27 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Komuro, H., R.Shichi, R., H,Nakano, and Y.Itoi: "Basement Relief under Sanbe Caldera Inferred from Gravity Anomaly (in Japanese)" Kazan (J.Volc.Soc.Japan). 41, No.1. 1-10 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Komuro, H., Shichi, R., H,Nakano, and S.Mouri: "Basement Relief under the Daisen-Hiruzen Volcanic Chain Inferred from Gravity Anomaly (in Japanese)" Kazan (J.Volc.Soc.Japan). 42.No.2. 153-157 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Nakai, S., K.Yamaguchi, K.Nitta, H.Yamamoto, K.Matsuo, M.Machida, M.Murakami, M.Ishihara, R.Shichi, and A.Yamamoto: "Data processing for the Japan Gravity Standardization Net 1996" IAG Sympo.Vol.117.Spriger-Verlag. 228-233 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Yamagiti, K., K.Nitta, H.Yamamoto, K.Matsuo, M.Machida, M.Murakami, M.Ishihara, S.Nakai, R.Shichi, and A.Yamamoto: "The Establishment of the Japan Grabity Standardization Net 1996" IAG Sympo.Vol.117.Spriger-Verlag. 241-248 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Kobayashi, S., S.Yoshida, S.Okubo, R.Shichi, T.Shimamoto, and T.Kato: "Hidden fault scarp inferred from gravity analysis and disaster belt of the 1995 Hyogo-Ken Nanbu Earthquake" IAG Sympo.Vol.117, Spriger-Verlag. 328-335 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Kobayashi, S., R.Shichi, S.Onizawa, J.Oikawa, and H.Watanabe: "Gravimetric Anomaly in Southern Kyushu, Japan (in Japanese)" Sci.Res.Rpt.Conductivity Anomaly (CA Res.Group). 275-281 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Nawa, K., Y.Fukao, R.Shichi, andY.Murata: "Inversion of gravity data to determine the terrain density distribution in southwest Japan" J.Geophys.Res.Vol.102, No.B12,27. 27703-27719

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Hagata, N., M.Adachi, and R.Shichi 1977: "Himi fault revealed by gravity survey in the west of the Toyama Plain, central Japan" J.Earth Planet.Sce.Nagoya Univ.Vol.44. 29-59 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Shichi, R.and Y.Murata: "Bouguer Gravity Anomaly Map of Shimane Prefecture (2 sheets inc.Geol.map)" Editorial Board of Geological Map of Shimane Prefecture. (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Nakai, S.: "Data processing for the Japan Gravity Standardization Net 1996" IAG Sympo. Vol. 117, Spriger-Verlag. 228-233 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] Yamagiti, K.: "The establishment of the Japan Gravity Standardization Net 1996" IAG Sympo. Vol. 117, Spriger-Verlag. 241-248 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] Kobayashi, S.: "Hidden fault scarp inferred from gravity analysis and disaster belt of the 1995 Hyogo-Ken Nanbu Earthquake" IAG Sympo. Vol. 117, Spriger-Verlag. 328-335 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] Nawa, K.: "Inversion of gravity data to determine the terrain density distribution in southwest Japan," J. Geophys. Res.Vol.102, No. B12,. 27,703-27,719 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] Hagita, N.: "Himi fault revealed by gravity survey in the west of the Toyama Plain, central Japan" J. Earth Planet. Sci. Nagoya Univ.,. Vol.44,. 29-59 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] 小室裕明: "重力異常からみた大山-蒜山火山群の基盤形態" 火山,. 42,No.2,. 153-157 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] 志知龍一: "島根県重力異常図(新編 島根県地質図付図,20万分の1)" 島根県地質図編集委員会, 全2葉 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] 國友孝洋: "重力異常から見た甲府盆地の境界断層" 地震II. 48巻・4号. 439-450 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] 小室裕明: "重力異常から見た三瓶カルデラの基盤形態" 火山. 41巻・1号. 1-10 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] Kobayashi,S.: "Two-dimensional analysis of gravity anomaly across the Rokko fault system" J.Phys.Earth. Vol.44. 357-372 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] 小林茂樹: "霧島火山および周辺カルデラの地下構造解析,マグマの発生と挙動-地球進化における役割-" 文部省科研費重点領域報告(代表者:久城育夫). Vol.3. 85-94 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] Segawa,J.: "Gravity Measurement" Preliminary Report of The Hakuho-Maru Cruise KH-69-1. 17-27 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] 小室裕明: "重力異常からみた大山-蒜山火山群の基盤形態" 火山. vol.42(in press). (1997)

    • Related Report
      1996 Annual Research Report
  • [Publications] 中川一郎・志知龍一: "日中国際重力結合(III)-ラコスト重力計(G型)の感度特性" 測地学会誌. 41. 171-196 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] OKUBO.S.,Y.FUKUDA and R.SHICHI: "Determination of Gravity Field (National Report to the XXI IUGG Assembly)" Jour.Geod.Soc.Japan. 41. 309-332 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] 志知龍一・青木治三: "1995年兵庫県南部地震震源域の重力異常" 月刊地球. 13. 129-134 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] 小室裕明・和田浩之・志知龍一: "三瓶山の重力異常" 火山. (in press). (1996)

    • Related Report
      1995 Annual Research Report
  • [Publications] KOBAYASHI.S.et al.: "Two-Dimensional Analysis of Gravity Anomaly across the Rokko Fault System" Jour.Phys.Earth. 44(in press). (1996)

    • Related Report
      1995 Annual Research Report
  • [Publications] 国友孝洋・志知龍一: "重力異常から見た甲府盆地の境界断層" 地震. 49(in press). (1996)

    • Related Report
      1995 Annual Research Report

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Published: 1995-04-01   Modified: 2016-04-21  

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