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Slip distribution of the 1973 Nemuro-oki earthquake estimated from the re-examined geodetic data


Geodetic data, including leveling, tide-gauge, triangulation/trilateration, and repeated EDM data, from eastern Hokkaido, Japan, were re-examined to clarify the crustal deformation associated with the 1973 Nemuro-oki earthquake. We inverted the geodetic data to estimate the slip distribution on the interface of the subducting Pacific plate. The estimated coseismic slip, potentially including afterslip, showed a patch of large slip (i.e., an asperity) near the epicenter of the mainshock. The moment magnitude of the Nemuro-oki earthquake was estimated to be 8.0 from the geodetic data, which is comparable to the 2003 Mw = 8.0 Tokachi-oki earthquake. The estimated slip distribution suggests a 50 km-long gap in the coseismic slip between the 1973 Nemuro-oki and the 2003 Tokachi-oki earthquakes. The slip area of the 2004 Mw = 7.0 Kushiro-oki earthquake, estimated from GPS data, was located at the northwestern edge of the Nemuro-oki earthquake, which implies that the area may have acted as a barrier during the Nemuro-oki earthquake. The postseismic deformation observed by leveling and tide-gauge measurements suggests that the afterslip of the Nemuro-oki earthquake occurred at least in a western and northern (i.e., deeper) extension of the asperity on the plate interface.


  1. Akaike, H., Likelihood and the Bayes procedure, in Bayesian Statistics, edited by J. M. Bernardo, M. H. DeGroot, D. V. Lindley, and A. F. M. Smith, 143–166, University Press, Valencia, 1980.

  2. Baba, T., K. Hirata, T. Hori, and H. Sakaguchi, Offshore geodetic data conducive to the estimation of the afterslip distribution following the 2003 Tokachi-oki earthquake, Earth Planet. Sci. Lett., 241, 281–292, 2006.

  3. DeMets, C., R. G. Gordon, D. 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.

  4. Fukao, Y. and M. Furumoto, Foreshocks and multiple shocks of large earthquakes, Phys. Earth Planet. Inter., 10, 355–368, 1975.

  5. Geographical Survey Institute, Crustal deformations of Entire Japan, Rep. Coord. Comm. Earthq. Predict., 80, 5–27, 2008 (in Japanese).

  6. Hashimoto, M. and T. Tada, Horizontal crustal movements in Hokkaido and its tectonic implications, J. Seismol. Soc. Jpn. (Zisin), 41, 29–38, 1988 (in Japanese with English abstract).

  7. Headquarters for Earthquake Research Promotion, Long-term evaluation for seismic activities along the Chishima (Kuril) Trench (2nd Ed.),, 2004.

  8. Heki, K., S. Miyazaki, and H. Tsuji, Silent fault slip following an interplate thrust earthquake at the Japan Trench, Nature, 386, 595–598, 1997.

  9. Hirata, K., E. Geist, K. Satake, Y. Tanioka, and S. Yamaki, Slip distribution of the 1952 Tokachi-oki earthquake (M8.1) along the Kuril trench deduced from tsunami waveform inversion, J. Geophys. Res., 108(B4), 2196, doi:10.1029/2002JB001976, 2003.

  10. Kasahara, K. and T. Kato, Aseismic faulting following the 1973 Nemuro-oki earthquake, Hokkaido, Japan (a Retrospective Study), Pure Appl. Geophys., 157, 392–403, 1980.

  11. Kato, T. and K. Tsumura, Vertical land movement in Japan as deduced from tidal record, Bull Earthq. Res. Inst., Univ. Tokyo, 54, 559–628, 1979 (in Japanese with English abstract).

  12. Katsumata, K. and Y. Yamanaka, The 29 November 2004 M7.1 Kushiro-oki earthquake: An event between the on-going seismic quiescence area and the asperity ruptured by the 1973 Nemuro-oki earthquake, Geophys. Bull. Hokkaido Univ., 69, 23–39, 2006.

  13. Katsumata, K., N. Wada, and M. Kasahara, Newly imaged shape of the deep seismic zone within the subducting Pacific plate beneath the Hokkaido corner, Japan-Kurile arc-arc junction, J. Geophys. Res., 108(B12), 2565, doi:10.1029/2002JB002175, 2003.

  14. Kikuchi, M. and Y. Fukao, Inversion of long-period P-waves from great earthquakes along subduction zones, Tectonophysics, 144, 231–247, 1987.

  15. Komaki, K., Horizontal crustal movements revealed by geodetic measurements—Applications of a new method for estimating displacement vectors—, J. Geod. Soc. Jpn., 39, 387–410, 1993.

  16. Miura, S., Y. Suwa, A. Hasegawa, and T. Nishimura, The 2003 M8.0 Tokachi-oki earthquake? How much has the great event paid back slip debts?, Geophys. Res. Lett., 31, L05613, doi:10.1029/2003GL019021, 2004.

  17. Miyazaki, S. and K. M. Larson, Coseismic and early postseismic slip for the 2003 Tokachi-oki earthquake sequence inferred from GPS data, Geophys. Res. Lett., 35, L04302, doi:10.1029/2007GL032309, 2008.

  18. Nagai, R., M. Kikuchi, and Y. Yamanaka, Comparative study on the source process of recurrent large earthquakes in Sanriku-Oki region: The 1968 Tokachi-Oki earthquake and the 1994 Sanriku-oki earthquake, J. Seis-mol. Soc. Jpn. (Zisin), 52, 267–289, 2001 (in Japanese with English abstract).

  19. Nakanishi, A., A. J. Smith, S. Miura, T. Tsuru, S. Kodaira, K. Obana, N. Takahashi, P. R. Cummins, and Y. Kaneda, Structural factors controlling the coseismic rupture zone of the 1973 Nemuro-Oki earthquake, the southern Kuril Trench seismogenic zone, J. Geophys. Res., 109, B05305, doi:10.1029/2003JB002574, 2004.

  20. Namegaya, Y. and Y. Tsuji, Delayed peaks of tsunami waveforms at Miyako from earthquakes east off Hokkaido, in Tsunamis: Case Studies and Recent Developments, edited by K. Satake, 115–134, Springer, Netherlands, 2005.

  21. 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.

  22. Nishimura, T., Fault model of the 1952 Tokachi-oki earthquake induced from geodetic data, Earth Monthly, 28, 441–447, 2006 (in Japanese).

  23. Nishimura, T., T. Hirasawa, S. Miyazaki, T. Sagiya, T. Tada, S. Miura, and K. Tanaka, Temporal change of interplate coupling in northeastern Japan during 1995–2002 estimated from continuous GPS observations, Geophys. J. Int., 157, 901–916, 2004.

  24. Nyst, M., T. Nishimura, F. F. Pollitz, and W. Thatcher, Inference of post-seismic deformation mechanisms of the 1923 Kanto earthquake, J. Geophys. Res., 111, B05408, doi:10.1029/2005JB003901, 2006.

  25. Okada, T., Surface deformation due to shear and tensile faults in a half-space, Bull. Seismol. Soc. Am., 75, 1135–1154, 1985.

  26. Oleskevich, D. A., R. D. Hyndman, and K. Wang, The updip and downdip limits to great subduction earthquakes: Thermal and structural models of Cascadia, south Alaska, SW Japan, and Chile, J. Geophys. Res., 104(B7), 14965–14991, 1999.

  27. Ozawa, S., Geodetic inversion for the fault model of the 1994 Shikotan earthquake, Geophys. Res. Lett., 23, 2009–2012, 1996.

  28. Ozawa, S., M. Kaidzu, M. Murakami, T. Imakiire, and Y. Hatanaka, Coseismic crustal deformation after the Mw8 Tokachi-oki earthquake in Japan, Earth Planets Space, 56, 675–680, 2004.

  29. Sagiya, T. and W. Thatcher, Coseismic slip resolution along a plate boundary megathrust: The Nankai trough, southwest Japan, J. Geophys. Res., 104, 1111–1129, 1999.

  30. Sagiya, T., S. Miyazaki, and T. Tada, Continuous GPS array and present-day crustal deformation of Japan, Pure Appl. Geophys., 157, 2303–2322, 2000.

  31. Satake, K., K. Hirata, S. Yamaki, and Y. Tanioka, Re-estimation of tsunami source of the 1952 Tokachi-oki earthquake, Earth Planets Space, 58, 535–542, 2006.

  32. Satake, K., F. Nanayama, and S. Yamaki, Fault models of unusual tsunami in the 17th century along the Kuril trench, Earth Planets Space, 60, 925–935, 2008.

  33. Sella, G. F., T. Dixon, and A. Mao, REVEL: A model for recent plate velocities from space geodesy, J. Geophys. Res., 107(B4), doi10.1092/ 2000JB000033, 2002.

  34. Seno, T., Variation of downdip limit of the seismogenic zone near the Japanese islands: Implications for the serpentinization mechanism of the forearc mantle wedge, Earth Planet. Sci. Lett., 231, 249–262, 2005.

  35. Shen, Z., D. D. Jackson, and B. X. Ge, Crustal deformation across and beyond the Los Angeles Basin from geodetic measurements, J. Geophys. Res., 101, 27957–27980, 1996.

  36. Shimazaki, K., Nemuro-oki earthquake of June 17, 1973: A lithospheric rebound at the upper half of the interface, Phys. Earth Planet. Inter., 9, 314–327, 1974.

  37. Suwa, Y., S. Miura, A. Hasegawa, T. Sato, and K. Tachibana, Interplate coupling beneath NE Japan inferred from three-dimensional displacement field, J. Geophys. Res., 111, B04402, doi:10.1029/2004JB003203, 2006.

  38. Tada, T., Fault model and crustal movement of the 1973 Nemuro-oki Earthquake, J. Seismol. Soc. Jpn. (Zisin), 27, 120–128, 1974 (in Japanese with English abstract).

  39. Tanioka, Y., K. Hirata, R. Hino, and T. Kanazawa, Slip distribution of the 2003 Tokachi-oki earthquake estimated from tsunami waveform inversion, Earth Planets Space, 56, 373–376, 2004.

  40. Tanioka, Y., K. Satake, and K. Hirata, Recurrence of recent large earthquakes along the southernmost Kurile-Kamchatka Subduction zone, in Geophysical Monograph, 172, 145–152, AGU, Washington D.C., 2007.

  41. Utsu, T., Large earthquakes near Hokkaido and the expectancy of the occurrence of a large earthquake off Nemuro, Rep. Coord. Comm. Earthq. Predict., 7, 7–13, 1972 (in Japanese).

  42. Yamanaka, Y., Asperity map in Hokkaido and southern Kurile arc, Earth Monthly, 28, 427–431, 2006 (in Japanese).

  43. Yamanaka, Y. and M. Kikuchi, Source process of the recurrent Tokachi-oki earthquake on September 26, 2003, inferred from teleseismic body waves, Earth Planets Space, 55, e21–e24, 2003.

  44. Yamanaka, Y. and M. Kikuchi, Asperity map along the subduction zone in northeastern Japan inferred from regional seismic data, J. Geophys. Res., 109, B07307, doi10.1092/2003JB002683, 2004.

  45. Yoshida, S., A. Kato, N. Kato, and M. Nakatani, Interpretation of various slip modes on a plate boundary based on laboratory and numerical experiments, Earth Planets Space, 56, 795–801, 2004.

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Correspondence to Takuya Nishimura.

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Nishimura, T. Slip distribution of the 1973 Nemuro-oki earthquake estimated from the re-examined geodetic data. Earth Planet Sp 61, 1203–1214 (2009).

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Key words

  • Kuril Trench
  • Nemuro-oki earthquake
  • slip distribution
  • geodetic data