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Volume 60 Supplement 10

Special Issue: Special Section for the 2007 Noto Hanto Earthquake (2)

Aftershock observation of the Noto Hanto earthquake in 2007 using ocean bottom seismometers

Abstract

The Noto Hanto earthquake in 2007 (Mj 6.9) occurred on March 25, 2007 near the west coast of the Noto peninsula, Honshu, Japan. To study the aftershock activity under the sea, we deployed pop-up type ocean bottom seismometers (OBSs) from April 5 to May 8, 2007. We combined data from ten ocean bottom and four onshore seismic stations located around the rupture area of the earthquake and determined the preliminary distribution of the aftershocks. Most of the offshore aftershocks are located in a depth range between 2 and 10 km, and no earthquakes are observed in the lower crust. Hypocenters of deep events occurring at depths greater than 5 km are confined to an area northeastward from the largest aftershock in offshore region. Most of the aftershocks aligned along a high angle and southeast dipping plane, which is consistent with the geometry of the active faults revealed by previous seismic reflection surveys.

References

  • Hirata, N. and M. Matsu’ura, Maximum-likelihood estimation of hypocenter with origin time eliminated using nolinear inversion technique, Phys. Earth Planet. Inter., 47, 50–61, 1987.

    Article  Google Scholar 

  • Horikawa, H., Source process of the 2007 Noto-Hanto earthquake (M6.9), Abstr. Japan Geoscience Union Meet., Z255–P008, 2007.

    Google Scholar 

  • Kanazawa, T. and H. Shiobara, Newly developed ocean-bottom seismometer, Abstr. Japan Earth Planet. Sci. Joint Meet., I11–P82, 1994 (in Japanese).

    Google Scholar 

  • Katagawa, H., M. Hamada, S. Yoshida, H. Kadosawa, A. Mitsuhashi, Y. Kono, and Y. Kinugasa, Geological development of the west sea area of the Noto Peninsula district in the Neogene Tertiary to Quaternary, central Japan, J. Geogr., 114, 791–810, 2005 (in Japanese with English abstract).

    Article  Google Scholar 

  • Kato, A., S. Sakai, T. Iidaka, T. Iwasaki, E. Kurashimo, T. Igarashi, N. Hirata, T. Kanazawa, and Group for the aftershock observations of the 2007 Noto Hanto Earthquake, Three-dimensional velocity structure in the source region of the Noto Hanto Earthquake in 2007 imaged by a dense seismic observation, Earth Planets Space, 60, 105–110, 2008.

    Article  Google Scholar 

  • 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.

    Article  Google Scholar 

  • Mikumo, T., H. Wada, and M. koizumi, Seismotectonics of the Hida region, central Honshu, Japan, Tectonophysics, 147, 95–119, 1998.

    Article  Google Scholar 

  • Okamura, Y., Geological Map West of Noto Peninsula, Geological Survey of Japan, Tsukuba, 2008 (in press).

    Google Scholar 

  • Sakai, S., A. Kato, T. Iidaka, T. Iwasaki, E. Kurashimo, T. Igarashi, N. Hirata, T. Kanazawa, and the group for the joint aftershock observation of the 2007 Noto Hanto Earthquake, Highly resolved distribution of aftershocks of the 2007 Noto Hanto Earthquake by a dense seismic observation, Earth Planets Space, 60, 83–88, 2008.

    Article  Google Scholar 

  • Tobita, M., S. Ozawa, T. Nishimura, H. Yarai, H. Suito, M. Murakami, H. Une, A. Yamada, K. Takano, T. Yutsudo, M. Ishimoto, N. Ishikura, S. Kawamoto, and T. Amagai, Crustal Deformation and Fault Model of The Noto Hanto Earthquake in 2007, Abstr. Japan Geoscience Union Meet., Z255–P018, 2007.

    Google Scholar 

  • Urabe, T. and S. Tsukada, A workstation-assisted processing system for waveforme data from microearthquake network, Abstracts of Spring Meeting of Seismological Society of Japan, p. 70, 1991 (in Japanese).

    Google Scholar 

  • Wessel, P. and W. H. F. Smith, New version of generic mapping tools released, EOS Trans. AGU, 76, 329–336, 1995.

    Article  Google Scholar 

  • Yamada, T., T. Kanazawa, and S. Tsukada, Hypocenter determination by routine network using results of high-density temporal observation, Ab-str. Japan Earth and Planetary Science Joint Meet., B22–P20, 1997 (in Japanese).

    Google Scholar 

Download references

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Correspondence to Tomoaki Yamada.

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Yamada, T., Mochizuki, K., Shinohara, M. et al. Aftershock observation of the Noto Hanto earthquake in 2007 using ocean bottom seismometers. Earth Planet Sp 60, 1005–1010 (2008). https://doi.org/10.1186/BF03352860

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  • DOI: https://doi.org/10.1186/BF03352860

Key words

  • The 2007 Noto Hanto earthquake
  • OBS
  • aftershock distribution