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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 13, issue 3
Nat. Hazards Earth Syst. Sci., 13, 597–604, 2013
https://doi.org/10.5194/nhess-13-597-2013
© Author(s) 2013. This work is distributed under
the Creative Commons Attribution 3.0 License.
Nat. Hazards Earth Syst. Sci., 13, 597–604, 2013
https://doi.org/10.5194/nhess-13-597-2013
© Author(s) 2013. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 07 Mar 2013

Research article | 07 Mar 2013

Evaluation of seismo-electric anomalies using magnetic data in Taiwan

C. H. Chen1, H. L. Hsu2, S. Wen3, T. K. Yeh4, F. Y. Chang5, C. H. Wang1, J. Y. Liu5,6, Y. Y. Sun5, K. Hattori7, H. Y. Yen2, and P. Han7 C. H. Chen et al.
  • 1Institute of Earth Sciences, Academia Sinica, Taipei 115, Taiwan
  • 2Institute of Geophysics, National Central University, Jhongli 320, Taiwan
  • 3National Center for Research on Earthquake Engineering, Taipei 106, Taiwan
  • 4Department of Real Estate and Built Environment, National Taipei University, New Taipei City 237, Taiwan
  • 5Institute of Space Science, National Central University, Jhongli 320, Taiwan
  • 6Center for Space and Remote Sensing Research, National Central University, Jhongli 320, Taiwan
  • 7Graduate School of Science, Chiba University, Inage, Chiba 263-8522, Japan

Abstract. The Parkinson vectors derived from 3-component geomagnetic data via the magnetic transfer function are discussed with respect to epicentre locations and hypocentre depths of 16 earthquakes (M ≥ 5.5) in Taiwan during a period of 2002–2005. To find out whether electric conductivity changes would happen particularly in the seismoactive depth ranges, i.e. in the vicinity of the earthquake foci, the frequency dependent penetration depth of the electromagnetic waves (skin effect) is taken into account. The background distributions involving the general conductivity structure and the coast effect at 20 particular depths are constructed using the Parkinson vectors during the entire study period. The background distributions are subtracted from the time-varying monitor distributions, which are computed using the Parkinson vectors within the 15-day moving window, to remove responses of the coast effect and underlying conductivity structure. Anomalous depth sections are identified by deviating distributions and agree with the hypocentre depths of 15 thrust and/or strike-slip earthquakes with only one exception of a normal fault event.

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