Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/6174
AuthorsCianchini, G.* 
De Santis, A.* 
Balasis, G.* 
Mandea, M.* 
Qamili, E.* 
TitleSearching for possible seismogenic signatures in ionosphere by an entropy-based analysis of magnetic satellite data: A case study.
Issue Date26-Jun-2009
URIhttp://hdl.handle.net/2122/6174
KeywordsMagnetic Field
Satellite Data
Information Theory
Large Earthquake
Subject Classification04. Solid Earth::04.02. Exploration geophysics::04.02.07. Instruments and techniques 
05. General::05.01. Computational geophysics::05.01.01. Data processing 
05. General::05.05. Mathematical geophysics::05.05.99. General or miscellaneous 
AbstractThe importance of detecting possible electromagnetic signatures due to large 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’s orbiting CHAMP satellite, we apply an “ad hoc” technique based on the Information Theory, to the satellite magnetic data with the aim at extracting eventual time anomalies. This technique has small time-space resolution using a preliminary wavelet analysis in order to detect shorter-wavelength anomalies. Some examples are given for magnetic satellite data taken over periods including the times of two large earthquakes, one being the Sumatra region event on 26 December 2004 (M=9.1).
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