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Authors: Cianchini, G.*
De Santis, A.*
Balasis, G.*
Mandea, M.*
Qamili, E.*
Title: Entropy based analysis of satellite magnetic data for searching possible electromagnetic signatures due to big earthquakes
Editors: Trilling, L.; Massachussets Institute of Technology (MIT), USA
Perkins, D.; Harvard University, USA
Dionysiou, D. D.; University of Cincinnati, USA
Perlovsky, L.; Harvard University, USA
Davey, K.; IEEE Fellow, Editor IEEE Trans. on Magnetics, Austin, TX, USA
Landgrebe, D.; Purdue University, USA
Marino, M. A.; Civil & Environmental Eng., and Biological & Agricultural Engineering, University of California, CA, USA
Russell, D. L.; Virginia Tech., USA
Collicott, S. H.; School of Aeronautics and Astronautics, Univ. West Lafayette, USA
Ceccarelli, M.; University of Cassino, IT
Lund, J. W.; Oregon Institute of Technology, USA
Issue Date: 24-Feb-2009
Keywords: Earthquake precursors
Magnetic field
Satellite data
Wavelet Analysis
Shannon Entropy
Abstract: The importance of detecting possible electromagnetic signatures due to big earthquakes is self-evident, signatures which can be either anticipating, simultaneous or subsequent with respect to the main shock. Taking advantage of the present low Earth orbiting CHAMP satellite, we apply two “ad hoc” techniques both based on the Information Theory (after the seminal monograph by Shannon [1]) to the satellite magnetic data with the aim at extracting eventual time anomalies. These techniques have different time-space resolutions: the first technique requires a preliminary spherical harmonic analysis of daily magnetic data and, potentially, detects long-wavelength variations, while the second uses a preliminary wavelet analysis and can detect shorter-wavelength anomalies. Some examples are given for magnetic satellite data taken in correspondence with the two big earthquakes occurred in the Sumatra region on 26 December 2004 (M = 9.1) and 28 March 2005 (M = 8.6).
Appears in Collections:Conference materials
05.05.99. General or miscellaneous
04.02.07. Instruments and techniques

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