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Volume 60 Supplement 11

Special Issue: Special Section for the 2007 Chuetsu-oki, Niigata, Japan, Earthquake

Coseismic and postseismic deformation related to the 2007 Chuetsu-oki, Niigata Earthquake

Earth, Planets and Space volume 60, pages 1081–1086 (2008)Cite this article

Abstract

An intermediate-strength earthquake of magnitude Mj 6.8 occurred on July 16, 2007, centered beneath the Japan Sea a few kilometers offshore of Niigata Prefecture in central Japan. We constructed a dense GPS network to investigate postseismic deformation after this event, choosing our GPS sites carefully so as to complement the nationwide GPS GEONET array. Coseismic displacements caused by the mainshock detected at some GEONET sites were used to estimate coseismic fault parameters. The results indicate that the geodetic data can be explained by a combination of two rectangular faults dipping northwest and southeast. Minor but definite postseismic deformation was detected largely in the southern part of the dense network. The time series of site coordinates can be characterized by a logarithmic decay function, and the estimated time constant seems to be almost similar in range to that of the 2004 Mid-Niigata Prefecture Earthquake. We also found a possible site instability at 960566 (Izumo-zaki, GEONET) caused by a small, local landslide associated with the mainshock and therefore concluded that the data obtained at this site should not be used for coseismic or postseismic analysis.

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Authors and Affiliations

  1. Research Center for Prediction of Earthquakes and Volcanic Eruptions, Graduate School of Science, Tohoku University, Sendai, 980-8578, Japan

    Yusaku Ohta, Satoshi Miura, Takeshi Iinuma, Kenji Tachibana, Kayo Miyao & Akira Hasegawa

  2. Institute of Seismology and Volcanology, Faculty of Science, Kyushu University, Shimabara, 855-0843, Japan

    Takeshi Matsushima & Akihiko Hirao

  3. Institute of Seismology and Volcanology, Graduate School of Science, Hokkaido University, Sapporo, 060-0810, Japan

    Hiroaki Takahashi, Takahiro Maeda, Teruhiro Yamaguchi & Masamitsu Takada

  4. Graduate School of Environmental Studies, Nagoya University, Nagoya, 464-8602, Japan

    Takeshi Sagiya, Takeo Ito & Irwan Meilano

  5. Earthquake Research Institute, University of Tokyo, Tokyo, 113-0032, Japan

    Shin’ichi Miyazaki, Makiko Iwakuni & Tadafumi Ochi

  6. Department of Earth Sciences, Toyama University, Toyama, 930-8555, Japan

    Ryosuke Doke & Akira Takeuchi

Authors
  1. Yusaku Ohta
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  2. Satoshi Miura
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  3. Takeshi Iinuma
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  4. Kenji Tachibana
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  5. Takeshi Matsushima
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  6. Hiroaki Takahashi
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  7. Takeshi Sagiya
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  8. Takeo Ito
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  9. Shin’ichi Miyazaki
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  10. Ryosuke Doke
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  11. Akira Takeuchi
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  12. Kayo Miyao
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  13. Akihiko Hirao
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  14. Takahiro Maeda
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  15. Teruhiro Yamaguchi
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  16. Masamitsu Takada
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  17. Makiko Iwakuni
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  18. Tadafumi Ochi
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  19. Irwan Meilano
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  20. Akira Hasegawa
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Corresponding author

Correspondence to Yusaku Ohta.

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Ohta, Y., Miura, S., Iinuma, T. et al. Coseismic and postseismic deformation related to the 2007 Chuetsu-oki, Niigata Earthquake. Earth Planet Sp 60, 1081–1086 (2008). https://doi.org/10.1186/BF03353140

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  • DOI: https://doi.org/10.1186/BF03353140

Key words

  • Crustal deformation
  • coseismic slip
  • postseismic deformation
  • GPS
  • Niigata-Kobe Tectonic Zone