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Volume 56 Supplement 3

Special Issue: Special section for the 2003 Tokachi-oki earthquake

GPS observation of the first month of postseismic crustal deformation associated with the 2003 Tokachi-oki earthquake (M JMA 8.0), off southeastern Hokkaido, Japan

Earth, Planets and Space volume 56, pages 377–382 (2004)Cite this article

Abstract

To investigate the postseismic crustal deformation associated with the Tokachi-oki earthquake (M JMA = 8.0) of 26 September 2003 in Japan Standard Time (JST), off southeastern Hokkaido, Japan, we newly established thirty GPS sites just after the mainshock in the eastern part of Hokkaido. Rapid data analysis for one month after the mainshock clearly indicated postseismic displacements only in the horizontal components. Observed maximum horizontal displacement was 6.6 cm from 28 September to 24 October, 2003. Absence of the vertical suggests that afterslip occurred in and around the coseismic fault rather than at downdip extension. Time series of coordinates are characterized by logarithmic decay functions with 4–11 days relaxation times. This suggests that postseismic deformation was due to afterslip on the fault following the large earthquake.

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Authors and Affiliations

  1. Institute of Seismology and Volcanology, Hokkaido University, Sapporo, 060-0810, Japan

    Hiroaki Takahashi & Minoru Kasahara

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

    Shigeru Nakao, Teruyuki Kato, Takeshi Iinuma & Jun’ichi Fukuda

  3. Geological Survey of Hokkaido, Sapporo, 060-0819, Japan

    Noritoshi Okazaki

  4. Division of Earth and Planetary Sciences, Hokkaido University, Sapporo, 060-0810, Japan

    Junji Koyama

  5. Research Center for Seismology, Volcanology and Disaster Mitigation, Nagoya University, Nagoya, 464-8602, Japan

    Takeshi Sagiya & Takeo Ito

  6. Disaster Prevention Research Institute, Kyoto University, Uji, 611-0011, Japan

    Fumio Ohya, Kazutoshi Sato, Yasuyoshi Fujita, Manabu Hashimoto & Yoshinobu Hoso

  7. Institute of Seismology and Volcanology, Kyushu University, Shimabara, 855-0843, Japan

    Takeshi Matsushima & Yuhki Kohno

Authors
  1. Hiroaki Takahashi
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  2. Shigeru Nakao
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  3. Noritoshi Okazaki
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  4. Junji Koyama
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  5. Takeshi Sagiya
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  6. Takeo Ito
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  7. Fumio Ohya
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  8. Kazutoshi Sato
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  9. Yasuyoshi Fujita
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  10. Manabu Hashimoto
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  11. Yoshinobu Hoso
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  12. Teruyuki Kato
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  13. Takeshi Iinuma
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  14. Jun’ichi Fukuda
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  15. Takeshi Matsushima
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  16. Yuhki Kohno
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  17. Minoru Kasahara
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Corresponding author

Correspondence to Hiroaki Takahashi.

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Takahashi, H., Nakao, S., Okazaki, N. et al. GPS observation of the first month of postseismic crustal deformation associated with the 2003 Tokachi-oki earthquake (M JMA 8.0), off southeastern Hokkaido, Japan. Earth Planet Sp 56, 377–382 (2004). https://doi.org/10.1186/BF03353068

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  • DOI: https://doi.org/10.1186/BF03353068

Key words

  • The 2003 Tokachi-oki earthquake
  • GPS
  • postseismic deformation
  • afterslip