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Tectonomagnetic study in the eastern part of Hokkaido, NE Japan: Discrepancy between observed and calculated results

Earth, Planets and Space volume 56, pages 1049–1058 (2004)Cite this article

Abstract

Continuous and repeated geomagnetic observations have been performed at 8 stations in the eastern part of Hokkaido, NE Japan, to confirm a detailed picture of geomagnetic secular changes. The observation delineated anomalously large secular changes of about 1 nT/year that have lasted at least for about 3 to 30 years (depending on the period of observations) at 3 stations situated in the remarkable geomagnetic anomaly region. Contributions from the earth’s core or ionospheric origin are ruled out as source mechanisms because of the local distribution of the anomalous stations. Heat-triggered volcanomagnetic effect cannot be the origin of such secular changes because the stations are quite far from the volcanoes. Instead, we propose the changes originate from stress-induced tectonomagnetic effect (piezomagnetism). We performed piezomagnetic modeling under the condition that observed regional tectonic stress has been applied to the highly magnetized rock bodies inferred from the analysis of the observed geomagnetic anomalies. The modeling explained well the secular changes by assuming the stress sensitivity of the order of 10−2 MPa−1, which is one order larger than the ordinarily used value.

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Author notes

  1. Yasuhiro Sugisaki

    Present address: NEC Software Co. Ltd., China

  2. Kosuke Takahashi

    Present address: Research Center for Prediction of Earthquakes and Volcanic Eruptions, Graduate School of Science, Tohoku University, Japan

  3. Mitsuru Utsugi

    Present address: Institute for Geothermal Sciences, Graduate School of Science, Kyoto University, Japan

  4. Hiromitsu Oshima

    Present address: Institute of Seismology and Volcanology, Graduate School of Science, Hokkaido University, Japan

Affiliations

  1. Division of Earth and Planetary Sciences, Graduate School of Science, Hokkaido University, Sapporo, 060-0810, Japan

    Yasunori Nishida, Yasuhiro Sugisaki, Kosuke Takahashi, Mitsuru Utsugi & Hiromitsu Oshima

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  1. Yasunori Nishida
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Correspondence to Yasunori Nishida.

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Nishida, Y., Sugisaki, Y., Takahashi, K. et al. Tectonomagnetic study in the eastern part of Hokkaido, NE Japan: Discrepancy between observed and calculated results. Earth Planet Sp 56, 1049–1058 (2004). https://doi.org/10.1186/BF03352547

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  • DOI: https://doi.org/10.1186/BF03352547

Key words

  • Geomagnetic secular change
  • tectonomagnetism
  • stress sensitivity