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Volume 56 Supplement 2

Special Issue: Special section for IUGG workshop: Lithospheric Structure of a Supercontinent:Gondwana

Source processes of the foreshock, mainshock and largest aftershock in the 2003 Miyagi-ken Hokubu, Japan, earthquake sequence


The waveform inversions for the 2003 Miyagi-ken Hokubu earthquake sequence were performed using strong-motion records to determine the source processes. We carried out the inversions for the foreshock (M5.6), the mainshock (M6.4) and the largest aftershock (M5.5), respectively. The strong-motion waveforms observed at 10 stations from KiK-net and K-NET within about 70 km epicentral distance were used. The mainshock is composed of two subplanes dipping toward west. The strike direction of the south subplane is NE-SW and that of the north subplane is almost N-S. The fault plane of the foreshock is almost the same as that of the south subplane of the mainshock, but the strike direction of the largest aftershock is NW-SE. The asperities of the three earthquakes are not overlapped strongly each other and it is considered that this earthquake sequence is a result of seismic activity on a reverse fault, which is curved along strike, with time lags. The shallow asperity of the mainshock may result in specific distributions of damage and high accelerations.


  • 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 

  • Fukuyama, E., M. Ishida, D. S. Dreger, and H. Kawai, Automated seismic moment tensor determination by using on-line broadband seismic wave-forms, Zisin, 51, 149–156, 1998 (in Japanese with English abstract).

    Google Scholar 

  • Hasegawa, A., N. Umino, and A. Takagi, Double-planed structure of the deep seismic zone in the northeastern Japan arc, Tectonophys, 47, 43–58, 1978.

    Article  Google Scholar 

  • Ide, S., Source process of the 1997 Yamaguchi, Japan, earthquake analyzed in different frequency bands, Geophys. Res. Lett., 26, 1973–1976, 1999.

    Article  Google Scholar 

  • Iwasaki, T., T. Yoshii, T. Moriya, A. Kobayashi, M. Nishiwaki, T. Tsutsui, T. Iidaka, A. Ikami, and T. Masuda, Precise P and S wave velocity structures in the Kitakami massif, Northern Honshu, Japan, from a seismic refraction experiment, J. Geophys. Res., 99, 22187–22204, 1994.

    Article  Google Scholar 

  • JMA, On seismic intensity, 238 pp, Gyosei, Tokyo, 1996 (in Japanese).

  • JMA, Some reports for the 2003 Miyagi-ken Hokubu earthquake sequence, 07 26 miyagi/index.html, 2003 (in Japanese).

  • 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 seis-mograms, J. Phys. Earth, 33, 121–131, 1985.

    Article  Google Scholar 

  • Koketsu, K., Hypocenter determination with non-negative depth, Zisin, 42, 325–331, 1989 (in Japanese with English abstract).

    Google Scholar 

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

  • Mendoza, C. and S. H. Hartzell, Aftershock patterns and main shock faulting, Bull. Seismol. Soc. Am., 78, 1438–1449, 1988.

    Google Scholar 

  • Mori, J., Rupture directivity and slip distribution of the M 4.3 foreshock to the 1992 Joshua Tree earthquake, southern California, J. Geophys. Res., 86, 805–810, 1996.

    Google Scholar 

  • NIED, Earthquake mechanism information,, 2003.

  • Okada, T., N. Umino, Y. Ito, T. Matsuzawa, A. Hasegawa, and M. Kamiyama, Source processes of 15 September 1998 M 5.0 Sendai, Northern Japan, earthquake and its M 3.8 foreshock by waveform inversion, Bull. Seismol. Soc. Am., 91, 1607–1618, 2001.

    Article  Google Scholar 

  • Okada, T., N. Umino, and A. Hasegawa, Rupture process of July 2003 northern Miyagi earthquake sequence, NE Japan, estimated from double-difference hypocenter locations, Earth Planets Space, 55, 741–750, 2003.

    Article  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 

  • Sakai, Y., K. Koketsu, T. Kanno, and Y. Nakamura, Building damage by the 2003 Miyagi-oki and Miyagi-ken Hokubu earthquake, and character of strong-motion, Abstract for the annual meeting of Japan association for earthquake engineering, 2003 (in Japanese).

    Google Scholar 

  • The headquarters for Earthquake Research Promotion, About the strong-motion evaluation for supposing the Miyagi-oki earthquake, miyagi/index.htm, 2003 (in Japanese).

  • Tohoku University, Report papers for the 153rd meeting of the Coordinating Committee for Earthquake Prediction, 2003 (in press).

  • Waldhauser, F. and W. L. Ellsworth, A double-difference earthquake location algorithm: method and application to the Northern Hayward fault, California, Bull. Seismol. Soc. Am., 90, 1353–1368, 2000.

    Article  Google Scholar 

  • Yamanaka, Y. and M. Kikuchi, EIC seismological notes, No. 137, News/030725.gif, 030725M2.gif and 030726.gif, 2003.

  • 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 

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Correspondence to Kazuhito Hikima.

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Hikima, K., Koketsu, K. Source processes of the foreshock, mainshock and largest aftershock in the 2003 Miyagi-ken Hokubu, Japan, earthquake sequence. Earth Planet Sp 56, 87–93 (2004).

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