Advertisement

Earth, Planets and Space

, Volume 56, Issue 3, pp 377–382 | Cite as

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

  • Hiroaki Takahashi
  • Shigeru Nakao
  • Noritoshi Okazaki
  • Junji Koyama
  • Takeshi Sagiya
  • Takeo Ito
  • Fumio Ohya
  • Kazutoshi Sato
  • Yasuyoshi Fujita
  • Manabu Hashimoto
  • Yoshinobu Hoso
  • Teruyuki Kato
  • Takeshi Iinuma
  • Jun’ichi Fukuda
  • Takeshi Matsushima
  • Yuhki Kohno
  • Minoru Kasahara
Open Access
Letter

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.

Key words

The 2003 Tokachi-oki earthquake GPS postseismic deformation afterslip 

References

  1. Altamimi, Z., P. Sillard, and C. Boucher, ITRF2000: A new release of the International Terrestrial Reference Frame for earth science applications, J. Geophys. Res., 107, 2214, doi:10.1029/2001JB000561, 2002.CrossRefGoogle Scholar
  2. Aoki, Y. and C. H. Scholz, Vertical deformation of the Japanese islands, 1996–1999, J. Geophys. Res., 108, 2257, doi:10.1029/2002JB002129, 2003.CrossRefGoogle Scholar
  3. DeMets, C., R. Gordon, F. Argus, and S. Stein, Effect of recent revisions to the geomagnetic reversal time scale on estimates of current plate motions, Geophys. Res. Lett., 21, 2191–2194, 1994.CrossRefGoogle Scholar
  4. Ergintav, S., R. Burgmann, S. McClusky, R. Cakmak, R. E. Reilinger, O. Lenk, A. Barka, and H. Ozener, Postseismic deformation near the Izmit earthquake (17 August 1999, M7.5) rupture zone, Bull. Seism. Soc. Am., 92, 194–207, 2002.CrossRefGoogle Scholar
  5. Geographical Survey Institute of Japan, Vertical crustal movements in Japan estimated from the leveling observations data for the past 100 years, Report of the coordinating committee for earthquake prediction, 67, 555, 2002.Google Scholar
  6. Heki, K., Space geodetic observation of deep basal subduction erosion in northeastern Japan, Earth Sci. Planet. Lett., 219, 13–20, 2004.CrossRefGoogle Scholar
  7. Heki, K., S. Miyazaki, and H. Tsuji, Silent fault slip following an interplate thrust earthquake at the Japan Trench, Nature, 386, 595–598, 1997.CrossRefGoogle Scholar
  8. Hirakawa, K., Y. Nakamura, and T. Echigo, Large paleo-tsunamis along the Pacific coast of Tokachi region, Hokkaido, Chikyu Monthly, Special Issue, 31, 92–98, 2000 (in Japanese).Google Scholar
  9. Hugentobler, U., S. Schaer, and P. Fridez, Bernese GPS Software Version 4.2, University of Bern, 515 pp, 2001.Google Scholar
  10. Kasahara, M., A fault model of the 1952 Tokachi-oki earthquake, Program and Abstract of the Seismilogical Society of Japan, 2, 90, 1975 (in Japanese).Google Scholar
  11. Kasahara, K. and T. Kato, Aseismic faulting folloing the 1973 Nemuro-oki Earthquake, Hokkaido, Japan (a retrospective study), PAGEOPH, 119, 392–403, 1981.CrossRefGoogle Scholar
  12. Katsumata, K., M. Kasahara, S. Ozawa, and A. Ivashchenko, A five years super-slow precursor model for the 1994 M8.3 Hokkaido-Toho-Oki lithospheric earthquake based on tide gauge data, Geophys. Res. Lett., 29, 1654, doi:10.1029/2002GL014982, 2002.CrossRefGoogle Scholar
  13. Marone, C. J., C. H. Scholz, and R. Bilham, On the mechanics of earthquake afterslip, J. Geophys. Res., 96, 8441–8452, 1991.CrossRefGoogle Scholar
  14. Melbourne, T. I., F. H. Webb, J. M. Stock, and C. Reigber, Rapid postseismic transient in subduction zones from continuous GPS data, J. Geophys. Res., 107, doi:10.1029/2001JB000555, 2002.Google Scholar
  15. Miyazaki, S., T. Iwabuchi, K. Heki, and I. Naito, An impact of estimating tropospheric gradient on precise positioning in summer using the Japanese nationwide GPS array, J. Geophys. Res., 108, 2335, doi:10.1029/2000JB00113, 2003.Google Scholar
  16. Nakano, T. and K. Hirahara, GPS observation of posetseismic deformation for the 1995 Hyogo-ken Nanbu earthquake, Japan, Geophys. Res. Lett., 24, 503–506, 1997.CrossRefGoogle Scholar
  17. Nanayama, F., K. Satake, R. Furukawa, K. Shimokawa, B. F. Atwater, K. Shigeno, and S. Yamaki, Unusually large earthquakes inferred from tsunami deposits along the Kuril trench, Nature, 424, 660–663, 2003.CrossRefGoogle Scholar
  18. Okada, Y., Surface deformation due to shear and tensile faults in a half space, Bull. Seis. Soc. Am., 75, 1135–1154, 1985.Google Scholar
  19. Sawai, Y., Episodic emergence in the past 3000 years at the Akkeshi estuary, Hokkaido, northern Japan, Quaternary Reseach, 56, 231–241, 2001.CrossRefGoogle Scholar
  20. Sawai, Y., Evidence for 17th-century tsunamis generated on the Kuril-Kamchatka subduction zone, Lake Tokotan, Hokkaido, Japan, J. Asian Earth Sci., 20, 903–911, 2002.CrossRefGoogle Scholar
  21. Sawai, Y., H. Nasu, and Y. Yasuda, Fluctuations in relative sea-level during the past 3000 yr in the Onnetoh estuary, Hokkaido, northern Japan, J. Quater. Sci., 17, 607–622, 2002.CrossRefGoogle Scholar
  22. Scholz, C. H., The Mechanics of Earthquakes and Faulting, Cambridge University Press, 1990.Google Scholar
  23. Shimazaki, K., Nemuro-oki Eathquake of June 17, 1973: A lithospheric rebound at the upper half of the interface, Phys. Earth Planet. Int., 9, 314–327, 1974.CrossRefGoogle Scholar
  24. Takahashi, H., M. Okayama, M. Ichiyanagi, M. Takada, T. Yamaguchi, K. Hirata, T. Watanabe, H. Mikada, and M. Kasahara, Aftershock distribution of the 2003 Tokachi-oki earthquake (MJMA = 8.0) by land and submarine regional seismic network data, 2004 (submitted).Google Scholar
  25. Yamanaka, Y. and M. Kikuchi, Source processes of the recurrent Tokachioki earthquake on September 26, 2003, inferred from teleseismic body waves, Earth Planets Space, 55, e21–e24, 2003.CrossRefGoogle Scholar
  26. Wessel, P. and W. H. F. Smith, New Version of the Generic Mapping Tools Released, EOS Trans. AGU, 76, 329, 1995.CrossRefGoogle Scholar

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. 2004

Authors and Affiliations

  • Hiroaki Takahashi
    • 1
  • Shigeru Nakao
    • 2
  • Noritoshi Okazaki
    • 3
  • Junji Koyama
    • 4
  • Takeshi Sagiya
    • 5
  • Takeo Ito
    • 5
  • Fumio Ohya
    • 6
  • Kazutoshi Sato
    • 6
  • Yasuyoshi Fujita
    • 6
  • Manabu Hashimoto
    • 6
  • Yoshinobu Hoso
    • 6
  • Teruyuki Kato
    • 2
  • Takeshi Iinuma
    • 2
  • Jun’ichi Fukuda
    • 2
  • Takeshi Matsushima
    • 7
  • Yuhki Kohno
    • 7
  • Minoru Kasahara
    • 1
  1. 1.Institute of Seismology and VolcanologyHokkaido UniversitySapporoJapan
  2. 2.Earthquake Research InstituteUniversity of TokyoTokyoJapan
  3. 3.Geological Survey of HokkaidoSapporoJapan
  4. 4.Division of Earth and Planetary SciencesHokkaido UniversitySapporoJapan
  5. 5.Research Center for Seismology, Volcanology and Disaster MitigationNagoya UniversityNagoyaJapan
  6. 6.Disaster Prevention Research InstituteKyoto UniversityUjiJapan
  7. 7.Institute of Seismology and VolcanologyKyushu UniversityShimabaraJapan

Personalised recommendations