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Crustal deformation around the northern and central Itoigawa-Shizuoka Tectonic Line


We established a dense permanent GPS array around the northern and central Itoigawa-Shizuoka Tectonic Line (ISTL) in order to study loading processes of inland active faults. 1–4 years observation has revealed concentrated deformation (about 0.3 ppm/yr) around the East Matsumoto-Basin Fault, an active fault along the ISTL, consistent with historic triangulation data. The deformation pattern is explained by dislocation models incorporating horizontal detachment fault with steady slip in the upper crust. However, deformation data alone cannot determine the model and there exist different possibilities. The vicinity of the Gofukuji fault is being deformed less in spite of the large long-term slip rate. These observations indicate that the deformation pattern is laterally heterogeneous along the ISTL. The two faults are considered to be loaded by different mechanisms.


  1. Hirahra, K., M. Ando, Y. Hoso, Y. Wada, and T. Nakano, Following fault motions by GPS observation, Earth Monthly, 20, 149–153, 1998 (in Japanese).

  2. Hugentobler, U., S. Schaer, and P. Fridez (ed.), Documentation of the Bernese GPS software version 4.2, 515 pp., 2001.

  3. Ikami, A., T. Yoshii, S. Kubota, Y. Sasaki, A. Hasemi, T. Moriya, H. Miyamachi, R. S. Matsu’ura, and K. Wada, A seismic-refraction profile in and around Nagano prefecture, central Japan, J. Phys. Earth, 34, 457–474, 1986.

  4. Ikeda, Y. and N. Yonekura, Determination of late Quaternary rates of net slip on two major fault zones in central Japan, Bull. Dept. Geogr. Univ. Tokyo, 18, 49–63, 1986.

  5. Kato, K. and T. Sato, Geology of the Shinano-Ikeda region, Report of regional geological studies (with 1:50000 map), Geological Survey of Japan, 93 pp., 1983.

  6. Mao, A., C. G. A. Harrison, and T. Dixon, Noise in GPS coordinate time series, J. Geophys. Res., 104, 2797–2816, 1999.

  7. Okubo, S., Y. Ikeda, T. Kumamoto, G. Seta, N. Matsuta, H. Chiba, and Y. Arai, 2-D and 3-D subsurface density structure in the northern part of the Itoigawa-Shizuoka Tectonoic Line derived by gravity surveying, J. Geod. Soc. Japan, 46, 177–186, 2000.

  8. Okumura, K., K. Shimokawa, H. Yamazaki, and E. Tsukuda, Recent surface faulting events along the middle section of the Itoigawa-Shizuoka Tectonic Line—trenching survey of the Gofukuji Fault near Matsumoto, central Japan—, Zisin, 46, 425–438, 1994 (in Japanese with English abstract).

  9. Okumura, K., R. Imura, T. Imaizumi, M. Togo, H. Sawa, K. Mizuno, and Y. Kariya, Recent surface faulting events along the northern part of the Itoigawa-Shizuoka Tectonic Line—1ral Japan—, Zisin, 50 suppl., 35–51, 1998 (in Japanese with English abstract).

  10. Sagiya, T., Yet another fault model for the 1918 Omachi earthquake— implications for Itoigawa-Shizuoka Tectonic Line Fault Zone—, Zisin, 2002 (submitted).

  11. Sagiya, T. and T. Tada, Crustal deformation and tectonics of the eastern margin of Japan Sea, Earth Monthly, 20, 515–521, 1998 (in Japanese).

  12. Sagiya, T., S. Miyazaki, and T. Tada, Continuous GPS array and present-day crustal deformation of Japan, PAGEOPH, 157, 2303–2322, 2000.

  13. Shimazaki, K. and Y. Zhao, Dislocation model for strain accumulation in a plate collision zone, Earth Planets Space, 52, 1091–1094, 2000.

  14. Tada, T. and M. Hashimoto, Horizontal crustal deformation in the northern and central Fossa Magna regions and its tectonic significance, Chigaku Zasshi, 99, 92–97, 1990 (in Japanese with English abstract).

  15. Tsukuhara, H. and Y. Kobayashi, Crustal stress in the central and western parts of Honshu, Japan, Zisin, 44, 221–231, 1991 (in Japanese with English abstract).

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Correspondence to Takeshi Sagiya.

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Sagiya, T., Nishimura, T., Iio, Y. et al. Crustal deformation around the northern and central Itoigawa-Shizuoka Tectonic Line. Earth Planet Sp 54, 1059–1063 (2002).

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  • Active Fault
  • Lower Crust
  • Slip Rate
  • Crustal Deformation
  • Deformation Pattern