Skip to main content
Earth, Planets and Space
Download PDF

Volume 56 Supplement 3

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

  • Letter
  • Published:

Joint inversion of strong motion and geodetic data for the source process of the 2003 Tokachi-oki, Hokkaido, earthquake

Earth, Planets and Space volume 56, pages 329–334 (2004)Cite this article

An Erratum to this article was published on 24 June 2014

Abstract

The strong motion and geodetic data were individually inverted for the source process of the 2003 Tokachi-oki, Hokkaido, earthquake with a hypocenter 25 km deep and a fault plane above the subducting Pacific slab. Both the results show a simple slip distribution with a single major asperity, but the strong motion inversion may include a trade-off between slip location and rupture time and the geodetic inversion does not have sufficient resolution for far slips. We then carred out a joint inversion of the two datasets in order to overcome these weaknesses of the single dataset inversions. The resultant slip distribution still retains the simple pattern and has a seismic moment of 2.2 × 1021 N·m (Mw 8.2). The asperity, with a peak slip of 7.1 m, is located in the center of the fault plane 50 km away from the hypocenter in the down-dip direction. The slip rate functions on subfaults around the hypocenter and asperity indicate that the rupture propagated with a supershear speed on the upper part of the fault plane and slowed down to 100–90% of the S-wave velocity on the middle and lower parts. These simple slip patterns and near-supershear rupture may imply the maturity of the Hokkaido subduction zone around the source region.

References

  • Akaike, H., Likelihood and Bayes procedure, in Bayesian Statistics, edited by J. M. Bernardo et al., pp. 143–166, Univ. Press, Valencia, Spain, 1980.

    Google Scholar 

  • Aoi, S., K. Obara, S. Hori, K. Kasahara and Y. Okada, New strong-motion observation network: KiK-net, Eos Trans. AGU, 81 (48), Fall Meet. Suppl., Abstract S71A-05, 2000.

    Google Scholar 

  • Archuleta, R. J., A faulting model for the 1979 Imperial Valley earthquake, J. Geophys. Res., 89, 4559–4585, 1984.

    Article  Google Scholar 

  • Bouchon, M., N. Toksöz, H. Karabulut, M.-P. Bouin, M. Dietrich, M. Aktar and M. Edie, Seismic imaging of the 1999 Izmit (Turkey) rupture inferred from the near-fault recordings, Geophys. Res. Lett., 27, 3013–3016, 2000.

    Article  Google Scholar 

  • Earthquake Research Committee, Long-term evaluation of earthquakes along the Kuril trench, http://www.jishin.go.jp/main/chousa/03_mar_chishima/index.htm, Headquarters for Earthquake Research Promotion, Tokyo, 2003.

    Google Scholar 

  • Geographical Survey Institute, Crustal deformation of Japan detected GEONET, http://mekira.gsi.go.jp/ENGLISH/index.html, 1998.

    Google Scholar 

  • Ide, S., Source process of the 2003 Tokachi-oki earthquake using strong motion and ocean bottom waveforms—Fast rupture exceeds the S-wave velocity?, Prog. Abst. Seismol. Soc. Jpn., TP24, 2003.

    Google Scholar 

  • Iwasaki, T, H. Shiobara, A. Nishizawa, T. Kanazawa, K. Suyehiro, N. Hirata, T. Urabe and H. Shimamura, A detailed subduction structure in the Kuril trench deduced from ocean bottom seismographic refraction studies, Tectonophys., 165, 315–336, 1

    Article  Google Scholar 

  • JMA, Some reports for the 2003 Tokachi-oki earthquake, http://www.seisvol.kishou.go.jp/eq/2003_09_26_tokachi/index.html, 2003.

    Google Scholar 

  • Jonsson, S., H. Zebker, P. Segall and F. Amelung, Fault slip distribution of the 1999 Mw7.1 Hector Mine, California, earthquake, estimated from satellite radar and GPS measurements, Bull. Seismol. Soc. Am., 92, 1377–1389, 2002.

    Article  Google Scholar 

  • 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, 2565, doi:10.1029/2002JB002175, 2003.

    Article  Google Scholar 

  • Kinoshita, S., Kyoshin Net (K-NET), Seismol. Res. Lett., 69, 309–332, 1998.

    Article  Google Scholar 

  • Kohketsu, K., The extended reflectivity method for synthetic near-field seismograms, J. Phys. Earth, 33, 121–131, 1985.

    Article  Google Scholar 

  • Koketsu, K., T. Ohno, Y. Ikegami, Rupture process inversion using 3-D Green’s functions: the 1995 Kobe earthquake revisited, Eos Trans. AGU, 84(46), Fall Meet. Suppl., Abstract S42H-07, 2003.

    Google Scholar 

  • Miyazaki, S. and T. Kato, Coseismic slip and afterslip distributions of the 2003 Tokachi-oki earthquake derived from the GEONET data, http://wwweprc.eri.u-tokyo.ac.jp/teru/Tokachi-oki/kato.html, 2003.

    Google Scholar 

  • Murai, Y, S. Akiyama, K. Katsumata, T. Takanami, T. Yamashina, T. Watanabe, I. Cho, M. Tanaka, A. Kuwano, N. Wada, H. Shimamura, I. Furuya, D. Zhao and R. Sanda, Delamination structure imaged in the source area of the 1982 Urakawa-oki earthquake, Geophys. Res. Lett., 30, 1490, doi:10.1029/2002GL016459, 2003.

    Article  Google Scholar 

  • NIED, Earthquake mechanism information, http://www.hinet.bosai.go.jp/topics/miyagi030726/, 2003.

    Google Scholar 

  • Olson, A. H. and R. J. Apsel, Finite faults and inverse theory with application to the 1979 Imperial Valley earthquake, Bull. Seismol. Soc. Am., 72, 1969–2001, 1982.

    Google Scholar 

  • Rosakis, A. J., O. Samudrala and D. Coker, Cracks faster than the shear wave speed, Science, 284, 1337–1340, 1999.

    Article  Google Scholar 

  • Wald, D. J. and R. W. Graves, 2001, Resolution analysis of finite fault source inversion using one- and three-dimensional Green’s functions 2. Combining seismic and geodetic data, J. Geophys. Res., 106, 8767–8788, 2001.

    Article  Google Scholar 

  • Wald, D. J. and T. H. Heaton, Spatial and temporal distribution of slip for the 1992 Landers, California, earthquake, Bull. Seismol. Soc. Am., 82, 668–691, 1994.

    Google Scholar 

  • 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, e21-e24, 2003.

    Google Scholar 

  • 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 the rupture process of the 1995 Kobe earthquake, J. Phys. Earth, 44, 437–454, 1996.

    Article  Google Scholar 

Download references

Author information

Authors and Affiliations

  1. Earthquake Research Institute, University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo, 113-0032, Japan

    Kazuki Koketsu, Kazuhito Hikima & Shin’ichi Miyazaki

  2. Department of Geophysics, Stanford University, 397 Panama Mall, Standford, CA, 94305, USA

    Shin’ichi Miyazaki

  3. Department of Earth and Planetary Sciences, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-0033, Japan

    Satoshi Ide

Authors
  1. Kazuki Koketsu
    View author publications

    You can also search for this author in PubMed Google Scholar

  2. Kazuhito Hikima
    View author publications

    You can also search for this author in PubMed Google Scholar

  3. Shin’ichi Miyazaki
    View author publications

    You can also search for this author in PubMed Google Scholar

  4. Satoshi Ide
    View author publications

    You can also search for this author in PubMed Google Scholar

Corresponding author

Correspondence to Kazuki Koketsu.

Additional information

An erratum to this article is available at http://dx.doi.org/10.1186/BF03352504.

Rights and permissions

Reprints and permissions

About this article

Check for updates. Verify currency and authenticity via CrossMark

Cite this article

Koketsu, K., Hikima, K., Miyazaki, S. et al. Joint inversion of strong motion and geodetic data for the source process of the 2003 Tokachi-oki, Hokkaido, earthquake. Earth Planet Sp 56, 329–334 (2004). https://doi.org/10.1186/BF03353060

Download citation

  • Received:

  • Revised:

  • Accepted:

  • Published:

  • Issue Date:

  • DOI: https://doi.org/10.1186/BF03353060

Key words