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Fine fault structure of a moderate earthquake in the 2007 earthquake sequence of Northern Mie, Japan
Earth, Planets and Space volume 60, pages981–985(2008)
A moderate crustal earthquake (Mj = 5.4) occurred in the northern part of Mie Prefecture, Central Japan, 2007. In order to clarify the fault structure of the main shock and its relation to the active faults, we estimated the precise hypocenter locations and focal mechanisms. For the relocation of the hypocenters, we used the differential time obtained by both manual picking and waveform cross-correlation analysis. The estimated detailed fault structure suggests that the main shock ruptured the southwestward dipping fault plane. We found that the faults of the moderate earthquake possessed complex fault segments. Around the largest aftershock hypocenter, a subsidiary fault plane parallel to the main shock fault was identified. This result suggests that the fault structure around the deep part of the active fault is complicated. The hypocenters of the foreshock and main shock were located in the offset part of the aftershock alignment, implying that they did not occur on the same fault plane. The Chisato Fault and Yokkaichi Fault were located around the upward extension of the aftershock alignment. The main shock probably occurred in the deep parts of these faults.
Boatwright, J., Detailed spectral analysis of two small New York State earthquakes, Bull. Seismol. Soc. Am., 68, 1131–1177, 1978.
Douglas, A. D., G. C. Beroza, and W. L. Ellsworth, Foreshock sequence of the 1992 Landers, California, earthquake and its implications for earthquake nucleation, J. Geophys. Res., 100, 9865–9880, 1995.
Fukuyama, E., W. L. Ellsworth, F. Waldhause, and A. Kubo, Detailed fault structure of the 2000Western Tottori, Japan, Earthquake Sequence, Bull. Seismol. Soc. Am., 93, 1468–1478, 2003.
Hanmer, S., Great Slave Lake shear zone, Canadian Shield: Reconstructed vertical profile of a crustal-scale fault zone, Tectonophysics, 149, 245–264, 1988.
Ide, S., G. C. Beroza, S. G. Prejean, and W. L. Ellsworth, Apparent break in earthquake scaling due to path and site effects on deep borehole recordings, J. Geophys. Res., 108(B5), doi:10.1029/2001JB001617, 2003.
Ikeda, Y., T. Imaizumi, H. Sato, M. Togo, K. Hirakawa, and T. Miyamachi, in Atlas of Quaternary Thrust Fault in Japan, p. 254, University of Tokyo Press, Tokyo, 2002 (in Japanese).
Imanishi, K., Y. Kuwahara, T. Takeda, and Y. Haryu, The seismicity, fault structures, and stress field in the seismic gap adjacent to the 2004 Mid- Niigata earthquake inferred from seismological observations, Earth Planets Space, 58, 831–841, 2006.
Ishiyama, T., K. Mueller, H. Sato, and M. Togo, Coseismic fault-related fold model, growth structure, and the historic multisegment blind thrust earthquake on the basement-involved Yoro thrust, Central Japan, J. Geophys. Res., 112, B03S07, doi:10.1029/2006JB004377, 2007.
Jones, L. M., B. Wang, S. Xu, and T. J. Fitch, The foreshock sequence of the February 4, 1975, Haicheng Earthquake (M= 7.3), J. Geophys. Res., 87, 4575–4584, 1982.
Kagan, Y. Y., 3-D rotation of double-couple earthquake sources, Geophys. J. Int., 106, 708–716, 1991.
Kato, A., E. Kurashimo, N. Hirata, S. Sakai, and T. Iwasaki, Imaging the source region of the 2004 Mid-Niigata Prefecture earthquake and the evolution of a seismogenic thrust-related fold, Geophys. Res. Lett., 32, L07307, doi:10.1029/2005GL022355, 2005.
Norris, R. J., Strain localization within ductile shear zone beneath active faults: The Alpine Fault contrasted with the adjacent Otago Fault system, New Zealand, Earth Planets Space, 56, 1095–1101, 2004.
Obara, K., K. Kasahara, S. Hori, and Y. Okada, A densely distributed highsensitivity seismograph network in Japan: Hi-net by National Research Institute for Earth Science and Disaster Prevention, Rev. Sci. Instrum., 76, 021301-doi:10.1063/1.1854197, 2005.
Organization of the Headquarters for Earthquake Research Promotion, Long term Evaluations of Eastern Nunobiki Mountains active fault system, http://www.jishin.go.jp/main/chousa/04aprnunobiki/index.htm, 2005.
Research Group for Active Faults of Japan, Active Faults in Japan, revised edition, 437 pp., University of Tokyo Press, Tokyo, 1991 (in Japanese).
Sato, H., N. Hirata, K. Koketsu, K. Ito, D. Okaya, T. Iwasaki, T. Ito, K. Kasahara, S. Abe, T. Kawanaka, M. Matsubara, R. Kobayashi, and T. Ikawa, Seismic reflection profiling in the Kanto and Kinki Metropolitan Areas, Japan, Bull. Earthq. Res. Inst. Univ. Tokyo, 81, 233–238, 2006.
Shearer, P., Improving local earthquake locations using the L1 norm and waveform cross correlation: Application to the Whittier Narrows, California, aftershock sequence, J. Geophys. Res., 102, 8269–8283, 1997.
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, 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.
Ukawa, M., M. Ishida, S. Matsumura, and K. Kasahara, Hypocenter determination of the Kanto-Tokai Observation Network for microearthquakes, Rep. Nat’l. Res. Inst. Earth Sci. Disas. Prev., 53, 1–88, 1984.
Waldhauser, F. and W. L. Ellsworth, A double-difference earthquake location algorithm: Method and application to the Northern Hayward fault, Bull. Seismol. Soc. Am., 90, 1352–1368, 2000.
Wessel, P. and W. H. F. Smith, New version of the generic mapping tools released, Eos Trans. AGU, 76, 329, 1995.
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Yukutake, Y., Takeda, T. & Obara, K. Fine fault structure of a moderate earthquake in the 2007 earthquake sequence of Northern Mie, Japan. Earth Planet Sp 60, 981–985 (2008). https://doi.org/10.1186/BF03352854
- Earthquake sequence
- Northern Mie
- fault structure