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Volume 56 Supplement 3

Special Issue: Special section for the 2003 Tokachi-oki earthquake

Changes in groundwater level associated with the 2003 Tokachi-oki earthquake

Earth, Planets and Space volume 56, pages 395–400 (2004)Cite this article

Abstract

Groundwater level and flow rate at 44 wells are continuously observed by the Geological Survey of Japan and the Shizuoka and Gifu Prefectural Governments for monitoring seismic and volcanic activities. The 2003 Tokachi-oki earthquake (M8.0) occurred off the south coast of Hokkaido Island, Japan on September 26, 2003. The epicentral distance to the nearest observation well is about 250 km and that to the farthest is about 1200 km. At the 22 wells, we detected changes in groundwater level or flow rate in relation to the earthquake. Most of the changes are coseismic step-like changes and/or short-period oscillations. In the nearest two observation wells, long-period oscillations with the periods of 39 and 53 minutes were also observed for several days after the earthquake, which is likely due to tsunami. In comparison between distributions of changes in groundwater level and theoretical coseismic strain by the fault model, it is clear that step-like increases were found in the contraction area of the coseismic strain. The relationship between amounts of the observed step-like groundwater-level changes and theoretical ones, calculated by the fault model using strain sensitivities of groundwater level indicates that the groundwater levels in the several wells responded to the coseismic strain.

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Authors and Affiliations

  1. Geological Survey of Japan, AIST, 1-1-1 Higashi, Tsukuba, Ibaraki, 305-8567, Japan

    Tsutomu Sato, Norio Matsumoto, Yuichi Kitagawa, Naoji Koizumi, Makoto Takahashi, Yasuto Kuwahara, Hisao Ito, Akio Cho & Takashi Satoh

  2. Shizuoka Prefectural Government, 9-6 Ote-machi, Shizuoka, Shizuoka, 420-8601, Japan

    Kunio Ozawa

  3. Gifu University, 1-1 Yanagido, Gifu, Gifu, 501-1193, Japan

    Shigeki Tasaka

Authors
  1. Tsutomu Sato
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  2. Norio Matsumoto
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  3. Yuichi Kitagawa
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  4. Naoji Koizumi
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  5. Makoto Takahashi
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  6. Yasuto Kuwahara
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  7. Hisao Ito
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  8. Akio Cho
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  9. Takashi Satoh
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  10. Kunio Ozawa
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  11. Shigeki Tasaka
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Corresponding author

Correspondence to Tsutomu Sato.

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Sato, T., Matsumoto, N., Kitagawa, Y. et al. Changes in groundwater level associated with the 2003 Tokachi-oki earthquake. Earth Planet Sp 56, 395–400 (2004). https://doi.org/10.1186/BF03353071

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  • DOI: https://doi.org/10.1186/BF03353071

Key words

  • Groundwater level
  • flow rate
  • 2003 Tokachi-oki earthquake
  • coseismic strain
  • oscillation
  • tsunami