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Research Article

Electric and magnetic phenomena observed before the volcano-seismic activity in 2000 in the Izu Island Region, Japan

S. Uyeda, M. Hayakawa, T. Nagao, O. Molchanov, K. Hattori, Y. Orihara, K. Gotoh, Y. Akinaga, and H. Tanaka
PNAS May 28, 2002 99 (11) 7352-7355; https://doi.org/10.1073/pnas.072208499
S. Uyeda
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M. Hayakawa
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T. Nagao
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O. Molchanov
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K. Hattori
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Y. Orihara
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K. Gotoh
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Y. Akinaga
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H. Tanaka
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  1. Contributed by S. Uyeda

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Abstract

Significant anomalous changes in the ultra low frequency range (≈0.01 Hz) were observed in both geoelectric and geomagnetic fields before the major volcano-seismic activity in the Izu Island region, Japan. The spectral intensity of the geoelectric potential difference between some electrodes on Niijima Island and the third principal component of geomagnetic field variations at an array network in Izu Peninsula started to increase from a few months before the onset of the volcano-seismic activity, culminating immediately before nearby magnitude 6 class earthquakes. Appearance of similar changes in two different measurements conducted at two far apart sites seems to provide information supporting the reality of preseismic electromagnetic signals.

Footnotes

    • ↵† To whom reprint requests should be addressed. E-mail: suyeda{at}st.rim.or.jp.

  • Abbreviations

    M,
    magnitude;
    ULF,
    Ultra Low Frequency (0–100 Hz)
    • Accepted April 6, 2002.
    • Copyright © 2002, The National Academy of Sciences
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    Electric and magnetic phenomena observed before the volcano-seismic activity in 2000 in the Izu Island Region, Japan
    S. Uyeda, M. Hayakawa, T. Nagao, O. Molchanov, K. Hattori, Y. Orihara, K. Gotoh, Y. Akinaga, H. Tanaka
    Proceedings of the National Academy of Sciences May 2002, 99 (11) 7352-7355; DOI: 10.1073/pnas.072208499

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    Electric and magnetic phenomena observed before the volcano-seismic activity in 2000 in the Izu Island Region, Japan
    S. Uyeda, M. Hayakawa, T. Nagao, O. Molchanov, K. Hattori, Y. Orihara, K. Gotoh, Y. Akinaga, H. Tanaka
    Proceedings of the National Academy of Sciences May 2002, 99 (11) 7352-7355; DOI: 10.1073/pnas.072208499
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    Proceedings of the National Academy of Sciences: 116 (49)
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      • Abstract
      • Geoelectric Potential Changes.
      • Magnetic Field Changes.
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