- Open Access
Source process for complex fault system of the 2007 Chuetsu-oki, Niigata, Japan, earthquake
Earth, Planets and Space volume 61, pages273–278(2009)
The 2007 Chuetsu-oki earthquake occurred in the offshore area of Niigata Prefecture, central Japan, on 16 July 2007. The aftershock distribution shows two fault planes, dipping to the northwest and southeast, respectively, which form a cross-sectional “V” pattern. We analyze the kinematic source process for the two fault planes consistent with the aftershock distribution using teleseismic body waveform data. Our results indicate that the mainshock initiated rupture on both faults northeast of their intersection and that the rupture propagated unilaterally southwestward along the southeast-dipping fault. The maximum slip is 1.6 m on the southeastdipping fault, and the seismic moments of northwest- and southeast-dipping faults are 8.0 × 1017 N m (Mw 5.9) and 7.5 × 1018 N m (Mw 6.5), respectively. The forward modeling of geodetic displacement from the obtained fault model is consistent with the GPS and InSAR measurements. Successive conjugate reverse faults around the source region are identified from the reflection seismic sections. We presume that stress changes and complicated structures in property and geometry around the source region are the dominant causal factors for generating the complexity of coseismic fault system.
Bernard, P. and A. Zollo, The Irpinia (Italy) 1980 earthquake: Detailed analysis of a complex normal faulting, J. Geophys. Res, 94, 1631–1647, 1989.
Bowman, J. R., Geodetic evidence for conjugate faulting during the 1988 Tennant Creek, Australia earthquake sequence, Geophys. J. Int., 107, 47–56, 1991.
Bowman, J. R., G. Gibson, and T. Jones, Aftershocks of the 1988 January 22 Tennant Creek, Australia intraplate earthquakes: Evidence for a complex thrust fault geometry, Geophys. J. Int., 100, 87–97, 1990.
Choy, G. L. and J. R. Bowman, Rupture process of a multiple main shock sequence: Analysis of teleseismic, local, and field observations of the Tennant Creek, Australia, earthquakes of January 22, 1998, J. Geophys. Res., 95, 6867–6882, 1990.
Choy, G. L., J. Boatwright, J. W. Dewey, and S. A. Sipkin, A teleseismic analysis of the New Brunswick earthquake of January 9, 1982, J. Geophys. Res., 88, 2199–2212, 1983.
Hickman, S., R. Sibson, and R. Bruhn, Introduction to special section: Mechanical involvement of fluids in faulting, J. Geophys. Res., 100, 12831–12840, 1995.
Kikuchi, M. and H. Kanamori, Inversion of complex body waves-III, Bull. Seismol. Soc. Am., 81, 2335–2350, 1991.
Kikuchi, M. and H. Kanamori, Note on Teleseismic Body-Wave Inversion Program, http://www.eri.u-tokyo.ac.jp/ETAL/KIKUCHI/, 2003.
Langer, C. J., G. A. Bollinger, and H. M. Merghelani, Aftershocks of the 13 December 1982 North Yemen earthquake: Conjugate normal faulting in an extensional setting, Bull. Seismol. Soc. Am., 77, 2038–2055, 1987.
Lawson, C. L. and R. J. Hanson, Solving Least Squares Problems, 340 pp., Prentice-Hall, New Jersey, 1974.
Miyamachi, H., K. Iwakiri, H. Yakiwara, K. Goto, and T. Kakuta, Fine structure of aftershock distribution of the 1997 Northwestern Kagoshima Earthquakes with a three-dimensional velocity model, Earth Planets Space, 51, 233–246, 1999.
Nakajima, J. and A. Hasegawa, Deep crustal structure along the Niigata- Kobe Tectonic Zone, Japan: Its origin and segmentation, Earth Planets Space, 59, e5–e8, 2007.
No, T., N. Takahashi, S. Kodaira, K. Takizawa, and Y. Kaneda, Deformation structure off Niigata observed by seismic reflection data, 2008 Jpn. Geosci. Union Meet., T229–P002, 2008.
Okada, Y., Surface deformation due to shear and tensile faults in a halfspace, Bull. Seismol. Soc. Am., 75, 1135–1154, 1985.
Payne, S. J., J. E. Zollweg, and D. W. Rodgers, Stress triggering of conjugate normal faulting: Late aftershocks of the 1983 Ms 7.3 Borah Peak, Idaho, earthquake, Bull. Seismol. Soc. Am., 94, 828–844, 2004.
Qamar, A. and J. Zollweg, The 1990 Deming, Washington earthquakes: A sequence of shallow thrust earthquakes in the Pacific Northwest, EOS Trans. AGU, 71, 1145, 1990.
Reasenberg, P. A. and R. W. Simpson, Response of regional seismicity to the static stress change produced by the Loma Prieta earthquake, Science, 255, 1687–1690, 1992.
Sagiya, T., S. Miyazaki, and T. Tada, Continuous GPS array and presentday crustal deformation of Japan, Pure Appl. Geophys., 157, 2303–2322, 2000.
Sakai, S., N. Hirata, A. Kato, E. Kurashimo, T. Iwasaki, and T. Kanazawa, Multi-fault system of the 2004 Mid-Niigata Prefecture Earthquake and its aftershocks, Earth Planets Space, 57, 417–422, 2005.
Shibutani, T., Y. Iio, S. Matsumoto, H. Katao, T. Matsushima, S. Ohmi, F. Takeuchi, K. Uehira, K. Nishigami, B. Enescu, I. Hirose, Y. Kano, Y. Kohno, M. Korenaga, Y. Mamada, M. Miyazawa, K. Tatsumi, T. Ueno, H. Wada, and Y. Yukutake, Aftershock distribution of the 2004 Mid Niigata Prefecture Earthquake derived from a combined analysis of temporary online observations and permanent observations, Earth Planets Space, 57, 545–549, 2005.
Wetmiller, R. J., J. Adams, F. M. Anglin, H. S. Hasegawa, and A. E. Stevens, Aftershock sequences of the 1982 Miramichi, New Brunswick, earthquakes, Bull. Seismol. Soc. Am., 74, 621–653, 1984.
Yukutake, Y., T. Takeda, and K. Obara, Well-resolved hypocenter distribution using the double-difference relocation method in the region of the 2007 Chuetsu-oki Earthquake, Earth Planets Space, 60, 1105–1109, 2008.
About this article
Cite this article
Nakamura, T., Ishihara, Y., Yamanaka, Y. et al. Source process for complex fault system of the 2007 Chuetsu-oki, Niigata, Japan, earthquake. Earth Planet Sp 61, 273–278 (2009). https://doi.org/10.1186/BF03352907
- Chuetsu-oki earthquake
- source process
- conjugate fault
- teleseismic wave
- stress change