NHESS Natural Hazards and Earth System Sciences NHESS Nat. Hazards Earth Syst. Sci. 1684-9981 Copernicus Publications Göttingen, Germany 10.5194/nhess-1-75-2001 Application of a wavelet technique for the detection of earthquake signatures in the geomagnetic field Alperovich L. 1 Zheludev V. 2 Hayakawa M. 3 Dept. of Geophysics and Planetary Sciences, Ramat-Aviv, 69978 Tel-Aviv University, Israel School of Computer Science, Tel-Aviv University, 69978 Tel Aviv, Israel Dept. of Electronic Engineering, The University of Electro-Communications, Chofu, Tokyo, Japan 30 06 2001 1 1/2 75 81 Copyright: © 2001 L. Alperovich et al. 2001 This work is licensed under the Creative Commons Attribution-NonCommercial-ShareAlike 2.5 Generic License. To view a copy of this licence, visit https://creativecommons.org/licenses/by-nc-sa/2.5/ This article is available from https://nhess.copernicus.org/articles/1/75/2001/nhess-1-75-2001.html The full text article is available as a PDF file from https://nhess.copernicus.org/articles/1/75/2001/nhess-1-75-2001.pdf

We developed an algorithm especially adapted to <i>single-station </i>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 &quot;disturbed&quot; intervals (containing earthquakes) and &quot;quiet&quot; 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.