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Aftershock distribution of the 2004 Mid Niigata Prefecture Earthquake derived from a combined analysis of temporary online observations and permanent observations
Earth, Planets and Space volume 57, pages545–549(2005)
The 2004 Mid Niigata Prefecture Earthquake (Mj = 6.8) occurred on 23 October 2004 in the northeastern part of the Niigata-Kobe Tectonic Zone where large contraction rates were observed. The mainshock was followed by an anomalously intense aftershock activity that included nine Mj ≥5.5 aftershocks. We deployed three temporary online seismic stations in the aftershock area from 27 October, combined data from the temporary stations with those from permanent stations located around the aftershock area, and determined the hypocenters of the mainshock and aftershocks with a joint hypocenter determination (JHD) technique. The resulting aftershock distribution showed that major events such as the mainshock, the largest aftershock (Mj = 6.5), the aftershock on 27 October (Mj = 6.1), etc. occurred on different fault planes that were located nearly parallel or perpendicular to each other. This might be due to heterogeneous structure in the source region. The strain energy was considered to have been enough accumulated on the individual fault planes. These features are probably a cause of the anomalous intensity of the aftershock activity.
Geographical Survey Institute, The Mid Niigata prefecture Earthquakes in 2004, http://cais.gsi.go.jp/Research/topics/topic041023/topic041023.html, 2004.
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), doi:10.1007/s10346-005-0050-8, 2005.
Japan Meteorological Agency, http://www.seisvol.kishou.go.jp/eq/kyoshin/jishin/041023 niigata/1756/nigata main.htm, 2004.
Kato, A., E. Kurashimo, N. Hirata, S. Sakai, 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.
Kim, H. Y., Relationship between the upheaval process of the Uonuma Hills and the cumulative nature of the Muikamachi fault, central Japan, Active Fault Res., 24, 63–75, 2004.
Kim, H. Y. and A. Okada, Surface deformations associated with the October 2004 Mid-Niigata earthquakes: Description and Discussion, Earth Planets Space, 2005 (submitted).
Kissling, E., W. L. Ellsworth, D. Eberhart-Phillips, and U. Kradolfer, Initial reference models in local earthquake tomography, J. Geophys. Res., 99, 19635–19646, 1994.
National Research Institute for Earth Science and Disaster Prevention (NIED), Earthquake mechanism information, http://www.fnet.bosai.go.jp/freesia/event/hypo/200410.html and 200411.html, 2004.
Ozawa, T., S. Nishimura, Y. Wada, and H. Ohkura, Coseismic deformation of the Mid Niigata prefecture Earthquake in 2004 detected by RADARSAT/InSAR, Earth Planets Space, 57, 423–428, 2005.
Sagiya, T., S. Miyazaki, and T. Tada, Continuous GPS array and present-day crustal deformation of Japan, Pure Appl. Geophys., 157, 2303–2322, 2000.
Takano, O., Changes in depositional systems and sequences in response to basin evolution in a rift and inverted basin: an example from the Neogene Niigata-Shin’etsu basin, North Fossa Magna, central Japan, Sedimentary Geology, 152, 79–97, 2002.
Takeuchi, A., Stress field and tectonic process during the Neogene and later period in the northern part of Nagano Prefecture, central Japan, J. Geol. Soc. Jpn., 83, 679–691, 1977 (in Japanese with English abstract).
Ueno, H., S. Hatakeyama, T. Aketagawa, J. Funasaki, and N. Hamada, Improvement of hypocenter determination procedures in the Japan Meteorological Agency, Quater. J. Seismol., 65, 123–134, 2002 (in Japanese with English abstract).
Urabe, T., N. Hirata, and K. Takano, A nation-wide seismic telemetry network in Japan using satellite communication, EOS, 79(45), F569, 1998.
Wessel, P. and W. H. F. Smith, Free software helps map and display data, EOS, Trans., Am. Geophys. Union, 72, 441, 1991.
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Shibutani, T., Iio, Y., Matsumoto, S. et al. Aftershock distribution of the 2004 Mid Niigata Prefecture Earthquake derived from a combined analysis of temporary online observations and permanent observations. Earth Planet Sp 57, 545–549 (2005) doi:10.1186/BF03352590
- The 2004 Mid Niigata Prefecture Earthquake
- aftershock distribution
- complexity of earthquake faults
- temporary online aftershock observations