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Volume 56 Supplement 8

Special Issue: IUGG Hagiwara Symposium

Origin of the concentrated deformation zone in the Japanese Islands and stress accumulation process of intraplate earthquakes

Earth, Planets and Space volume 56, pages 831–842 (2004)Cite this article

Abstract

The nature and origin of the concentrated deformation zone along the Japan Sea coast (NKTZ: Niigata-Kobe Tectonic Zone) were clarified by analyzing various observations. We made a qualitative modeling for the stress state and deformation style in and around the NKTZ. In this model a weak zone with low viscosity exists in the lower crust beneath the NKTZ. In the surrounding region, however, the viscosity in the lower crust is very high and can be regarded as elastic for the periods of a recurrence interval of intraplate earthquakes. The concentrated deformation is basically attributed to the low viscosity in the weak zone. In more details, the concentrated deformation is thought to be generated by a postseismic deformation of the weak zone to the previous large intraplate earthquake in the interseismic period (the brittle-ductile interaction model) and/or anelastic deformation in both the upper and lower crusts in the NKTZ, under a finite constant force (the anelastic deformation model).

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Authors and Affiliations

  1. Research Center for Earthquake Prediction, Disaster Prevention Research Institute, Kyoto University, Gokasho Uji, Kyoto, 611-0011, Japan

    Yoshihisa Iio

  2. Research Center for Seismology, Volcanology and Disaster Mitigation, Nagoya University, Chikusa-ku, Nagoya, 464-8602, Japan

    Takeshi Sagiya

  3. Institute for Geoscience, University of Tsukuba, Tsukuba, Ibaragi, 305-0006, Japan

    Yoji Kobayashi

Authors
  1. Yoshihisa Iio
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  2. Takeshi Sagiya
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  3. Yoji Kobayashi
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Correspondence to Yoshihisa Iio.

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Iio, Y., Sagiya, T. & Kobayashi, Y. Origin of the concentrated deformation zone in the Japanese Islands and stress accumulation process of intraplate earthquakes. Earth Planet Sp 56, 831–842 (2004). https://doi.org/10.1186/BF03353090

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  • DOI: https://doi.org/10.1186/BF03353090

Key words

  • Intraplate earthquake
  • lower crust
  • anelastic deformation
  • weak zone
  • concentrated deformation
  • NKTZ