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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 1, issue 1/2
Nat. Hazards Earth Syst. Sci., 1, 75–81, 2001
https://doi.org/10.5194/nhess-1-75-2001
© Author(s) 2001. This work is licensed under
the Creative Commons Attribution-NonCommercial-ShareAlike 2.5 License.

Special issue: Double Issue: Seismic hazard evaluation - Part I

Nat. Hazards Earth Syst. Sci., 1, 75–81, 2001
https://doi.org/10.5194/nhess-1-75-2001
© Author(s) 2001. This work is licensed under
the Creative Commons Attribution-NonCommercial-ShareAlike 2.5 License.

  30 Jun 2001

30 Jun 2001

Application of a wavelet technique for the detection of earthquake signatures in the geomagnetic field

L. Alperovich1, V. Zheludev2, and M. Hayakawa3 L. Alperovich et al.
  • 1Dept. of Geophysics and Planetary Sciences, Ramat-Aviv, 69978 Tel-Aviv University, Israel
  • 2School of Computer Science, Tel-Aviv University, 69978 Tel Aviv, Israel
  • 3Dept. of Electronic Engineering, The University of Electro-Communications, Chofu, Tokyo, Japan

Abstract. We developed an algorithm especially adapted to single-station wavelet detection of geomagnetic events, which precede or accompany the earthquakes. The detection problem in this situation is complicated by a great variability of earthquakes and accompanied phenomena, which aggravates finding characteristic features of the events. Therefore we chose to search for the characteristic features of both "disturbed" intervals (containing earthquakes) and "quiet" recordings. In this paper we propose an algorithm for solving the problem of detecting the presence of signals produced by an earthquake via analysis of its signature against the existing database of magnetic signals. To achieve this purpose, we construct the magnetic signature of certain earthquakes using the distribution of the energies among blocks, which consist of wavelet packet coefficients.

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