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Determination of dip direction for the 2007 Chuetsu-oki earthquake from relocation of aftershocks using arrival times determined by cross-correlation


Waveform correlations were used to redetermine P arrival times at 31 stations for a selected set of 321 aftershocks of the 2007 Chuetsu-oki earthquake. These data were used with several different relocation techniques, 1-D velocity structure, 3-D velocity structure using SIMULPS12, 1-D velocity structure using hypoDD, and 3-D velocity structure using tomoDD. The results from all of these methods show a consistent southeast dipping trend for the entire aftershock sequence. The same pattern is also seen for the time period before the largest aftershock. These results indicate that the mainshock fault dips to the southeast.


  1. Eberthart-Phillips, D., Local earthquake tomography: Earthquake source regions, in Seismic Tomography; Theory and Practice, edited by H. M. Iyer and K. Hirahara, 842 pp, Chapman and Hall, London, 1993.

  2. Evans, J., D. Eberhart-Phillips, and C. H. Thurber, User’s manual for SIMULPS12 for imaging vp and vp/vs: A derivative of the ‘Thurber’ tomographic inversion SIMUL3 for local earthquakes, USGS Open-File Report, 94–431, 1994.

  3. Got, J.-L., J. Frechet, and F. W. Klein, Deep fault plane geometry inferred from multiplet relative relocation beneath the south flank of Kilauea, J. Geophys. Res., 99, 15,375–15,386, 1994.

  4. Hirata, N., H. Sato, S. Sakai, and A. Kato, The earthquake source fault of the 2007 Niigata-ken Chuetsu-Oki earthquake: The relationship with the seismogenic Nagaoka Plain Seien Fault Zone, Kagaku, 77, 930–934, 2007 (in Japanese).

  5. Kato, A., S. Sakai, E. Kurashimo, T. Igarashi, T. Iidaka, N. Hirata, T. Iwasaki, T. Kanazawa, and Group for the aftershock observations of the 2007 Niigataken Chuetsu-oki Earthquake, Imaging heterogeneous velocity structures and complex aftershock distributions in the source region of the 2007 Niigataken Chuetsu-oki Earthquake by a dense seismic observation, Earth Planets Space, 60, this issue, 1111–1116, 2008.

  6. Liu, J., K. Sieh, and E. Hauksson, A structural interpretation of the aftershock ‘Cloud’ of the 1992 Mw 7.3 Landers earthquake, Bull. Seismol. Soc. Am., 93, 1333–1344, 2003.

  7. Shearer, P., E. Hauksson, and G. Lin, Southern California hypocenter relocation with waveform cross-correlation, part 2: Results using sourcespecific station terms and cluster analysis, Bull. Seismol. Soc. Am., 95, 904–915, 2005.

  8. Shibutani, T., H. Katao, and Group for the dense aftershock observations of the 2000 Western Tottori Earthquake, High resolution 3-D velocity structure in the source region of the 2000 Western Tottori Earthquake in southwestern Honshu, Japan using very dense aftershock observations, Earth Planets Space, 57, 825–838, 2005

  9. Shinohara, M., T. Kanazawa, T. Yamada, K. Nakahigashi, S. Sakai, R. Hino, Y. Murai, A. Yamazaki, K. Obana, Y. Ito, K. Iwakiri, R. Miura, Y. Machida, K. Mochizuki, K. Uehira, M. Tahara, A. Kuwano, S. Amamiya, S. Kodaira, T. Takanami, Y. Kaneda, and T. Iwasaki, Precise aftershock distribution of the 2007 Chuetsu-oki Earthquake obtained by using an ocean bottom seismometer network, Earth Planets Space, 60, this issue, 1121–1126, 2008.

  10. Waldhauser, F., hypoDD: A program to compute double-difference hypocenter locations, USGS Open-File Report, 01–113, 2001.

  11. 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, 1353–1368, 2000.

  12. 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, this issue, 1105–1109, 2008.

  13. Zhang, H. and C. H. Thurber, Double-difference tomography: The method and its application to the Hayward fault, California, Bull Seismol. Soc. Am., 93, 1875–1889, 2003.

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Correspondence to Jim Mori.

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Mori, J. Determination of dip direction for the 2007 Chuetsu-oki earthquake from relocation of aftershocks using arrival times determined by cross-correlation. Earth Planet Sp 60, 1117–1120 (2008).

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Key words

  • Aftershocks
  • Chuetsu-oki earthquake
  • fault plane