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A Gravity Database of Southwest Japan: Application to Bouguer Gravity Imaging in Kyushu District, Southwest Japan

  • R. Shichi
  • A. Yamamoto
  • T. Kudo
  • Y. Murata
  • K. Nawa
  • M. Komazawa
  • M. Nakada
  • H. Miyamachi
  • H. Komuro
  • Y. Fukuda
  • T. Higashi
  • Y. Yusa
  • I. Nakagawa
  • H. Watanabe
  • J. Oikawa
  • S. Kobayashi
  • I. Ohno
Part of the International Association of Geodesy Symposia book series (IAG SYMPOSIA, volume 128)

Abstract

In order to investigate subsurface density structures with the highest precision, two major gravity databases and some unpublished data files, which cover Southwest Japan, are recompiled. This paper presents some examples of the detailed gravity anomaly maps in Kyushu District, southwest Japan. These maps indicate various fine subsurface structures, which may arose with tectonic movements and/or volcanic activities of this region. With an aid of geological and topographical information, we discussed relationships between characteristic patterns of the detailed gravity anomalies and subsurface structures in this region. The most conspicuous feature is an existence of a steep horizontal gradient zone of gravity anomalies running through the Aso Caldera in the ENE-WSW direction. Although the location of the westward extension of the Median Tectonic Line (MTL) in this region is still debatable, this zone seems to be the westernmost part of MTL.

Keywords

Gravity database Gravity anomaly Kyushu district Southwest Japan 

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References

  1. The Geological Survey of Japan (ed.) (2000), Gravity CD-ROM of Japan, Digital Geoscience Map P-2, Geological Survey of Japan.Google Scholar
  2. The Gravity Research Group in Southwest Japan (Representatives: Ryuichi Shichi and Akihiko Yamamoto) (2001), Gravity Measurements and Database in Southwest Japan, Gravity Database of Southwest Japan (CD-ROM), Bull. Nagoya University Museum, Special Rept., No.9.Google Scholar
  3. Huzita, K. (1980). Role of the Median Tectonic Line in the Quaternary Tectonics if the Japanese Islands. Mem. Geological Soc. Japan, 18, pp. 129–153.Google Scholar
  4. Kakuta, T., H. Miyamachi, H. Kubota and A. Takagi (1992). Crustal Earthquakes in Kyushu. Zisin. Journal of the Seismological Society of Japan, 45, pp. 229–237.Google Scholar
  5. Komazawa, M. (1995). Gravimetric Analysis of Aso Volcano and its Interpretation. J. Geod. Soc. Japan, 41, 17–46.Google Scholar
  6. Nakada, T. and T. Imaizumi (ed.) (2002). Digital Active Fault Map of Japan. Univ. of Tokyo Press.Google Scholar
  7. Yokoyama, I. (1965). Structure of caldera and gravity anomaly. Bull. Volcanol., 26, pp. 67–72.Google Scholar

Copyright information

© Springer-Verlag Berlin Heidelberg 2005

Authors and Affiliations

  • R. Shichi
    • 1
  • A. Yamamoto
    • 2
  • T. Kudo
    • 3
  • Y. Murata
    • 4
  • K. Nawa
    • 4
  • M. Komazawa
    • 4
  • M. Nakada
    • 5
  • H. Miyamachi
    • 6
  • H. Komuro
    • 7
  • Y. Fukuda
    • 8
  • T. Higashi
    • 8
  • Y. Yusa
    • 8
  • I. Nakagawa
    • 9
  • H. Watanabe
    • 10
  • J. Oikawa
    • 10
  • S. Kobayashi
    • 11
  • I. Ohno
    • 12
  1. 1.College of EngineeringChubu UniversityKasugai, AichiJapan
  2. 2.Graduate School of ScienceHokkaido UniversitySapporoJapan
  3. 3.Tono Geoscience CenterJapan Nuclear Cycle Development InstituteAkeyo, MizunamiJapan
  4. 4.The Geological Survey of JapanNational Institute of Advanced Industrial Science and TechnologyIbarakiJapan
  5. 5.Graduate School of ScienceKyshu UniversityFukuokaJapan
  6. 6.Faculty of ScienceKagoshima UniversityKagoshimaJapan
  7. 7.Interdisciplinary Faculty of Science and EngineeringShimane UniversityMatsueJapan
  8. 8.Graduate School of ScienceKyoto UniversityKyotoJapan
  9. 9.Daiichi Fukken Engineering Co., Ltd.FukuokaJapan
  10. 10.Earthquake Research InstituteUniversity of TokyoTokyoJapan
  11. 11.Space and Earth Information Technology, School of EngineeringKyushu Tokai UniversityKumamotoJapan
  12. 12.Department of Earth Sciences, Faculty of ScienceEhime UniversityMatsuyamaJapan

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