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Natural Hazards and Earth System Sciences An interactive open-access journal of the European Geosciences Union
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Volume 11, issue 3
Nat. Hazards Earth Syst. Sci., 11, 965–970, 2011
https://doi.org/10.5194/nhess-11-965-2011
© Author(s) 2011. This work is distributed under
the Creative Commons Attribution 3.0 License.

Special issue: Progress in research on earthquake precursors

Nat. Hazards Earth Syst. Sci., 11, 965–970, 2011
https://doi.org/10.5194/nhess-11-965-2011
© Author(s) 2011. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 25 Mar 2011

Research article | 25 Mar 2011

Evaluation of ULF electromagnetic phenomena associated with the 2000 Izu Islands earthquake swarm by wavelet transform analysis

P. Han1, K. Hattori1, Q. Huang2, T. Hirano1, Y. Ishiguro1, C. Yoshino1, and F. Febriani1 P. Han et al.
  • 1Graduate School of Science, Chiba University, Chiba, Japan
  • 2School of Earth and Space Sciences, Peking University, Beijing, China

Abstract. There have been many reports on ULF electromagnetic phenomena associated with the 2000 Izu Islands earthquake swarm. In this study, seismo-magnetic anomalies are presented by examining energy variations of signatures at the periods around 100 s. Geomagnetic data observed at three stations in Izu Peninsula from 1 January 2000 to 30 April 2001 have been analyzed and wavelet transform has been performed. In order to indentify anomalous changes from ionosphere disturbances, Kakioka station has been chosen as a reference station, and the similar data analysis has been performed. The results suggest that the unusual energy enhancement of the Z component, which only appears in Izu Peninsula from late June until early November 2000, might possibly be one of electromagnetic phenomena associated with the 2000 Izu Islands earthquake swarm.

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