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Earth, Planets and Space

, Volume 60, Issue 11, pp 1081–1086 | Cite as

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

  • Yusaku Ohta
  • Satoshi Miura
  • Takeshi Iinuma
  • Kenji Tachibana
  • Takeshi Matsushima
  • Hiroaki Takahashi
  • Takeshi Sagiya
  • Takeo Ito
  • Shin’ichi Miyazaki
  • Ryosuke Doke
  • Akira Takeuchi
  • Kayo Miyao
  • Akihiko Hirao
  • Takahiro Maeda
  • Teruhiro Yamaguchi
  • Masamitsu Takada
  • Makiko Iwakuni
  • Tadafumi Ochi
  • Irwan Meilano
  • Akira Hasegawa
Open Access
Letter

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.

Key words

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

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Copyright information

© The Society of Geomagnetism and Earth, Planetary and Space Sciences (SGEPSS); The Seismological Society of Japan; The Volcanological Society of Japan; The Geodetic Society of Japan; The Japanese Society for Planetary Sciences. 2008

Authors and Affiliations

  • Yusaku Ohta
    • 1
  • Satoshi Miura
    • 1
  • Takeshi Iinuma
    • 1
  • Kenji Tachibana
    • 1
  • Takeshi Matsushima
    • 2
  • Hiroaki Takahashi
    • 3
  • Takeshi Sagiya
    • 4
  • Takeo Ito
    • 4
  • Shin’ichi Miyazaki
    • 5
  • Ryosuke Doke
    • 6
  • Akira Takeuchi
    • 6
  • Kayo Miyao
    • 1
  • Akihiko Hirao
    • 2
  • Takahiro Maeda
    • 3
  • Teruhiro Yamaguchi
    • 3
  • Masamitsu Takada
    • 3
  • Makiko Iwakuni
    • 5
  • Tadafumi Ochi
    • 5
  • Irwan Meilano
    • 4
  • Akira Hasegawa
    • 1
  1. 1.Research Center for Prediction of Earthquakes and Volcanic Eruptions, Graduate School of ScienceTohoku UniversitySendaiJapan
  2. 2.Institute of Seismology and Volcanology, Faculty of ScienceKyushu UniversityShimabaraJapan
  3. 3.Institute of Seismology and Volcanology, Graduate School of ScienceHokkaido UniversitySapporoJapan
  4. 4.Graduate School of Environmental StudiesNagoya UniversityNagoyaJapan
  5. 5.Earthquake Research InstituteUniversity of TokyoTokyoJapan
  6. 6.Department of Earth SciencesToyama UniversityToyamaJapan

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