Special Issue: Special section for IUGG workshop: Lithospheric Structure of a Supercontinent:Gondwana
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Source processes of the foreshock, mainshock and largest aftershock in the 2003 Miyagi-ken Hokubu, Japan, earthquake sequence
Earth, Planets and Space volume 56, pages 87–93 (2004)
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.
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.
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).
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.
Ide, S., Source process of the 1997 Yamaguchi, Japan, earthquake analyzed in different frequency bands, Geophys. Res. Lett., 26, 1973–1976, 1999.
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.
JMA, On seismic intensity, 238 pp, Gyosei, Tokyo, 1996 (in Japanese).
JMA, Some reports for the 2003 Miyagi-ken Hokubu earthquake sequence, http://www.seisvol.kishou.go.jp/eq/2003 07 26 miyagi/index.html, 2003 (in Japanese).
Kinoshita, S., Kyoshin Net (K-NET), Seismol. Res. Lett., 69, 309–332, 1998.
Kohketsu, K., The extended reflectivity method for synthetic near-field seis-mograms, J. Phys. Earth, 33, 121–131, 1985.
Koketsu, K., Hypocenter determination with non-negative depth, Zisin, 42, 325–331, 1989 (in Japanese with English abstract).
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.
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.
NIED, Earthquake mechanism information, http://www.hinet.bosai.go.jp/topics/miyagi030726/, 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.
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.
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.
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).
The headquarters for Earthquake Research Promotion, About the strong-motion evaluation for supposing the Miyagi-oki earthquake, http://www.jishin.go.jp/main/kyoshindo/03jun 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.
Yamanaka, Y. and M. Kikuchi, EIC seismological notes, No. 137, http://wwweic.eri.u-tokyo.ac.jp/EIC/EIC 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.
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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). https://doi.org/10.1186/BF03353392
- Source process
- waveform inversion
- strong motion
- earthquake sequence