Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/5025
AuthorsCianchini, G.* 
De Santis, A.* 
Balasis, G.* 
Mandea, M.* 
Qamili, E.* 
TitleEntropy based analysis of satellite magnetic data for searching possible electromagnetic signatures due to big earthquakes
Issue Date24-Feb-2009
URIhttp://hdl.handle.net/2122/5025
KeywordsEarthquake precursors
Magnetic field
Satellite data
Wavelet Analysis
Shannon Entropy
Subject Classification04. Solid Earth::04.02. Exploration geophysics::04.02.07. Instruments and techniques 
05. General::05.05. Mathematical geophysics::05.05.99. General or miscellaneous 
AbstractThe 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

Files in This Item:
File Description SizeFormat 
ID609_081_cianchini_et_al_cambridge_wseas09_v11.pdfmain article269.99 kBAdobe PDFView/Open
Show full item record

Page view(s)

316
Last Week
0
Last month
3
checked on Aug 21, 2017

Download(s)

220
checked on Aug 21, 2017

Google ScholarTM

Check