Earth, Planets and Space

, Volume 53, Issue 8, pp 793–803 | Cite as

Co-seismic slip, post-seismic slip, and aftershocks associated with two large earthquakes in 1996 in Hyuga-nada, Japan

Open Access


We analyzed continuous GPS data to investigate the spatial distribution of post-seismic slip associated with two large earthquakes of October 19 and December 2, 1996, in Hyuga-nada, Japan. We found that the moment release due to post-seismic events was comparable to the co-seismic moment release during the two earthquakes. The source parameters of the first post-seismic event are as follows: the moment release = 1.7 × 1019 Nm; the maximum slip = 0.06 m at about 50 km northwest from the epicenter of the first earthquake; the characteristic decay time (= final slip/initial slope) = 15 days. For the second post-seismic event, the moment release = 2.0 × 1019 Nm; the maximum slip = 0.13 m at about 15 km northwest from the epicenter of the second earthquake; the characteristic time = 100 days. In both events, the slip vectors of the downgoing Philippine Sea (PHS) Plate on the SW-striking interplate boundary are directed west, in accordance with the co-seismic slip. It is also shown that the sites for co-seismic slip, post-seismic slip, and aftershocks do not overlap but complementarily share the plate boundary. This suggests that individual sites are characterized by their own constitutive laws, which may control modes of moment release as well as the entire sequence.


Fault Plane Moment Release Slip Vector Postseismic Deformation Slow Slip 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


  1. Akaike, H., Likelihood and bayes procedure, in Bayesian Statistics, edited by J. M. Bernardo, M. H. DeGroot, D. V. Lindley, and A. F. M. Smith, pp. 143–166, University Press, Valencia, Spain, 1980.Google Scholar
  2. 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
  3. Hirose, H., K. Hirahara, F. Kimata, N. Fujii, and S. Miyazaki, A slow thrust slip event following the two 1996 Hyuganada earthquakes beneath the Bungo Channel, southwest Japan, Geophys. Res. Lett., 26, 3237–3240, 1999.CrossRefGoogle Scholar
  4. Ide, S., M. Takeo, and Y. Yoshida, Source process of the 1995 Kobe earthquake: determination of spatio-temporal slip distribution by Bayesian modeling, Bull. Seism. Soc. Am., 86, 547–566, 1996.Google Scholar
  5. Langbein, J. and H. Johnson, Correlated errors in geodetic time series: implicationsfor time-dependent deformation, J. Geophys. Res., 102, 591–603, 1997.CrossRefGoogle Scholar
  6. Maruyama, T., Static elastic dislocation in an infinite and semi-infinite medium, Bull. Earthq. Res. Inst., 42, 289–368, 1964.Google Scholar
  7. Nishimura, T., The Spatiotemporal Distribution of Coseismic and Postseismic Slip Associated with the 1994 Far Off Sanriku Earthquake, M. Sc. Thesis, University of Tohoku, 1997.Google Scholar
  8. Peacock, S. M. and K. Wang, Seismic consequences of warm versus cool subduction metamorphism: examples from southwest and northeast Japan, Science, 286, 937–939, 1999.CrossRefGoogle Scholar
  9. Scholz, C. H., The Mechanics of Earthquake and Faulting, pp. 314–317, Cambridge University Press, New York, 1990.Google Scholar
  10. Scholz, C. H., Earthquake and friction laws, Nature, 391, 37–42, 1998.CrossRefGoogle Scholar
  11. Segall, P., R. Burgmann, and M. Matthews, Time-dependent triggered afterslip following the 1989 Loma Prieta earthquake, J. Geophys. Res., 105, 5615–5634, 2000.CrossRefGoogle Scholar
  12. Seno, T., S. Stein, and A. D. Gripp, A model for motion of the Philippine Sea Plate consistent with NUVEL-1 and Geological Data, J. Geophys. Res., 98, 17941–17948, 1993.CrossRefGoogle Scholar
  13. Shen, Z., D. D. Jackson, Y. Feng, M. Cline, M. Kim, P. Fang, and Y. Bock, Postseismic deformation following the Landers Earthquake, California, 28 June 1992, Bull. Seism. Soc. Am., 84, 780–791, 1994.Google Scholar
  14. Smith, S. W. and M. Wyss, Displacement on the San Andreas fault subsequent to the 1966 Parkfield earthquake, Bull. Seis. Soc. Am., 58, 1955–1973, 1968.Google Scholar
  15. Stein, R. S. and M. Lisowski, The 1979 Homestead valley earthquake sequence, California: control of aftershocks and postseismic deformation, J. Geophys. Res., 88, 6477–6490, 1983.CrossRefGoogle Scholar
  16. Tada, T., Spreading of the Okinawa Trough and its relation to the crustal deformation in the Kyushu (2), Zishin, 38, 1–12, 1985 (in Japanese).Google Scholar
  17. Tada, T, T. Sagiya, and S. Miyazaki, Crustal deformation in the Japan Islands by using GPS network, Kagaku, 67, 917–927, 1997 (in Japanese).Google Scholar
  18. Thatcher, W. and J. B. Rundle, A viscoelastic coupling model for the cyclic deformation due to periodically repeated earthquakes at subduction zones, J. Geophys. Res., 89, 1984.Google Scholar
  19. Wyatt, F. K., Displacement of surface monuments: horizontal motion, J. Geophys. Res., 87, 979–989, 1982.CrossRefGoogle Scholar
  20. Wyatt, F. K., Displacement of surface monuments: vertical motion, J. Geophys. Res., 94, 1655–1664, 1989.CrossRefGoogle Scholar
  21. Yabuki, T. and M. Matsu’ura, Geodetic data inversion using a Bayesian information criterion for spatial distribution of fault slip, Geophys. J. Int., 109, 363–375, 1992.CrossRefGoogle Scholar
  22. Yagi, Y, M. Kikuchi, S. Yoshida, and T. Sagiya, Comparison of the coseismic rupture with the aftershock distribution in the Hyuga-nada earthquakes of 1996, Geophys. Res. Lett, 26, 3161–3164, 1999.CrossRefGoogle Scholar
  23. Yoshida, S., Waveform inversion using ABIC for the rupture process of the 1983 Hindu Kush earthquake, Phys. Earth Planet. Inter., 56, 389–405, 1989.CrossRefGoogle Scholar
  24. Yoshida, S., K. Koketsu, B. Shibazaki, T. Sagiya, T. Kato, and Y. Yoshida, Joint inversion of near- and far-field waveforms and geodetic data for rupture process of the 1995 Kobe earthquake, J. Phys. Earth, 44, 437–454, 1996.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. 2001

Authors and Affiliations

  1. 1.Earthquake Research InstituteThe University of TokyoBunkyo-ku, TokyoJapan
  2. 2.Geographical Survey InstituteTsukubaJapan

Personalised recommendations