Skip to main content

A geomagnetic total intensity anomaly originated from lightning-induced isothermal remanent magnetization: case of the Yatsugatake Magnetic Observatory, central Japan

Abstract

Magnetic total intensity anomaly maps of the Yatsugatake Magnetic Observatory, central Japan, in 1975, 1982 and 2005 are examined. The magnetic environment seems to be stable during this period except for the appearance of an anomalous thin patch-pair in the middle part of the observatory sometime between 1975 and 1982. The peak-to-peak amplitude of the patch-pair is about 80 nT at 2 m above ground level. The magnetization induced by the horizontal electric current in the ground due to the lightning which hit the observatory area in July 1981 is a probable cause for the patch-pair. Modeling confirmed that the characteristics of the patch-pair are well reproduced by model magnetizations that represent lightning-induced isothermal remanent magnetization acquired from horizontal lightning electric current in the ground. The required maximum magnetization to explain the peak-to-peak amplitude of the patch-pair is estimated to be in the range of 10 to 40 A/m.

References

  • Aida, N., Natural remanent magnetizations and ferromagnetic minerals of the late pleistocene volcanic ash (“younger loam”) of the Yatsugatake volcanoes, central Japan, Quat. Res., 17, 86–94, 1978 (in Japanese with English abstract).

    Article  Google Scholar 

  • Cox, A., Anomalous remanent magnetization of basalt, U.S. Geol. Surv. Bull., 1083-E, 131–160, 1961.

    Google Scholar 

  • Graham, K. W. T., The re-magnetization of a surface outcrop by lightning currents, Geophys. J. Roy. Astron. Soc., 6, 85–102, 1961.

    Article  Google Scholar 

  • Jones, G. and D. L. Maki, Lightning induced magnetic anomalies on archaeological sites, Archaeol. Prospect., 12, 191–197, 2005.

    Article  Google Scholar 

  • Maki, D., Lightning strikes and prehistoric ovens: Determining the source of magnetic anomalies using techniques of environmental magnetism, Geoarcheology, 20, 449–459, 2005.

    Article  Google Scholar 

  • Sakai, H., S. Sunada, and H. Sakurano, Study of lightning current by remanent magnetization, Elec. Eng. in Japan, 123, 1050–1055, 1997.

    Google Scholar 

  • Utada, H. and S. Koyama, Variation of magnetic intensity at Yatsugatake geomagnetic observatory due to lightning strike (July, 1981), Proceedings of Conductivity Anomaly Research, 181–186, 1982. (in Japanese)

    Google Scholar 

  • Verrier, V. and P. Rochette, Estimating peak currents at ground lightning impacts using remanent magnetzation, Geophys. Res. Lett., 29(18), 1867, doi:10.1029/2002GL015207, 2002.

    Article  Google Scholar 

  • Wasilewski, P. and G. Kletetschka, Lodestone: Natures only permanent magnet-What it is and how it gets charged, Geophys. Res. Lett., 26(15), 2275–2278, 1999.

    Article  Google Scholar 

  • Yukutake, T., S. Koyama, and T. Yoshino, Geomagnetic environment of Yatsugatake geomagnetic observatory, Bull. Earthq. Res. Inst., 50, 73–81, 1975 (in Japanese with English abstract).

    Google Scholar 

Download references

Author information

Authors and Affiliations

Authors

Corresponding author

Correspondence to Hisayoshi Shimizu.

Rights and permissions

Open Access  This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made.

The images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder.

To view a copy of this licence, visit https://creativecommons.org/licenses/by/4.0/.

Reprints and Permissions

About this article

Cite this article

Shimizu, H., Koyama, T., Koyama, S. et al. A geomagnetic total intensity anomaly originated from lightning-induced isothermal remanent magnetization: case of the Yatsugatake Magnetic Observatory, central Japan. Earth Planet Sp 59, 141–149 (2007). https://doi.org/10.1186/BF03352687

Download citation

  • Received:

  • Revised:

  • Accepted:

  • Published:

  • Issue Date:

  • DOI: https://doi.org/10.1186/BF03352687

Key words

  • Magnetic anomaly map
  • lightning-induced isothermal remanent magnetization
  • magnetic environment
  • total intensity