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Short-term spatiotemporal variations in the aftershock sequence of the 2004 mid-Niigata prefecture earthquake
Earth, Planets and Space volume 57, pages551–556(2005)
We deployed 56 temporary seismic stations within approximately a month after the occurrence of the 2004 mid-Niigata prefecture earthquake. Using manually-picked arrival data obtained from the temporary and surrounding permanent seismic stations, 1056 aftershocks have been relocated. Based on the spatiotemporal variations in the relocated aftershocks, the cluster activities associated with the mainshock and some large aftershock events are identified. The aftershocks associated with the mainshock, the largest occurred on the two steep west-dipping planes at an angle of 60° and approximately 5 km away. In contrast, the aftershocks following the event on Oct. 27 are aligned on east-dipping plane at a low angle of 25°. It is further observed that the aftershock area extended in both northeastward and southwestward directions at a later stage. The triggered seismicity around the northeast edge was more significant than that around the southwest edge. This difference could be understood by the discrepancy in the shear stress level accumulated at the dynamic shear rupture due to the mainshock.
Fukuyama, E., W. L. Ellsworth, F. Waldhaused, and A. Kubo, Detailed fault structure of the 2000 Western Tottori, Japan, Earthquake sequence, Bull. Seism. Soc. Am., 93, 1468–1478, 2003.
Hirata, N. and M. Matsu’ura, Maximum-likelihood estimation of hypocenter with origin time eliminated using nonlinear inversion technique, Phys. Earth Planet. Inter., 47, 50–61, 1987.
Hirata, N., H. Sato, S. Sakai, A. Kato, and E. Kurashimo, Fault system of the 2004 Mid Niigata Prefecture Earthquake and its aftershocks, Landslides, 2(2), 2005.
Honda, R., S. Aoi, N. Morikawa, H. Sekiguchi, T. Kunugi, and H. Fujiwara, Ground motion and rupture process of the 2004 Mid Niigata Prefecture earthquake obtained from strong motion data of K-NET and KiK-net, Earth Planets Space, 57, this issue, 527–532, 2005.
Kato, A., E. Kurashimo, N. Hirata, T. Iwasaki, and T. Kanazawa, 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:10.1029/2005GL022366, 2005.
Kato, N., T. Echigo, H. Sato, M. Tateishi, S. Ogino, S. Sakai, S. Toda, S. Koshiya, T. Ito, T. Toyoshima, T. Imaizumi, H. Kato, and S. Abe, High resolution seismic reflection profiling across the surface rupture associated with the 2004 Mid-Niigata Prefecture earthquake (M6.8), central Japan, Earth Planets Space, 57, 447–452, 2005.
Okada, T., N. Umino, and A. Hasegawa, Rupture process of the July 2003 northern Miyagi earthquake sequence, NE Japan, estimated from double-difference hypocenter locations, Earth Planets Space, 55, 741–750, 2003.
Okada, T., N. Umino, T. Matsuzawa, J. Nakajima, N. Uchida, T. Nakayama, S. Hirahara, T. Sato, S. Hori, T. Kono, Y. Yabe, K. Ariyoshi, S. Gamage, J. Shimizu, J. Suganomata, S. Kita, S. Yui, M. Arao, S. Hondo, T. Mizukami, H. Tsushima, T. Yaginuma, A. Hasegawa, Y. Asano, H. Zhang, and C. Thurber, Aftershock distribution and 3D seismic velocity structure in and around the focal area of the 2004 mid Niigata prefecture earthquake obtained by applying double-difference tomography to dense temporary seismic network data, Earth Planets Space, 57, 435–440, 2005.
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.
Sato, H., The relationship between late Cenozoic tectonic events and stress field and basin development in northeast Japan, J. Geophys. Res., 99, 22261–22274, 1994.
Sato, H. and N. Kato, Relationship between geologic structure and the source fault of the 2004 Mid Niigata Prefecture Earthquake, central Japan, Earth Planets Space, 57, 453–457, 2005.
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, 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, this issue, 545–549, 2005.
Stein, R. S., The role of stress transfer in earthquake occurrence, Nature, 402, 605–609, 1999.
Takahashi, H., T. Matsushima, T. Kato, A. Takeuchi, T. Yamaguchi, Y. Kohno, T. Katagi, J. Fukuda, K. Hatamoto, R. Doke, Y. Matsu’ura, and M. Kasahara, A fault model of an aftershock (M5.9) on November 8 and postseismic deformation of the 2004 Niigata Chuetsu earthquake (M6.8) by a dense GPS observation, Earth Planets Space, 2005 (submitted).
Takeda, T., H. Sato, T. Iwasaki, N. Matsuta, S. Sakai, T. Iidaka, and A. Kato, Crustal structure in the northern Fossa Magna region, central Japan, from refraction/wide-angle reflection data, Earth Planets Space, 56, 1293–1299, 2004.
Toda, S. and R. Stein, Toggling of seismicity by the 1997 Kagoshima earthquake couplet: A demonstration of timedependent stress transfer, J. Geophys. Res., 108(B12), 2567, doi:10.1029/2003JB002527, 2003.
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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Kato, A., Sakai, S., Hirata, N. et al. Short-term spatiotemporal variations in the aftershock sequence of the 2004 mid-Niigata prefecture earthquake. Earth Planet Sp 57, 551–556 (2005) doi:10.1186/BF03352591
- Mid-Niigata prefecture earthquake