Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/3911
AuthorsConsolini, G.* 
De Michelis, P.* 
Meloni, A.* 
TitleMultifractality and Punctuated Equilibrium in the Earth's Magnetic Field Polarity Reversals
Issue Date15-Jan-2000
Series/Report no.2 / 27 (2000)
URIhttp://hdl.handle.net/2122/3911
KeywordsMagnetic field polarity reversals
Multifractal approach
Punctuated equilibrium
Subject Classification04. Solid Earth::04.05. Geomagnetism::04.05.02. Geomagnetic field variations and reversals 
AbstractThe Earth's magnetic field has reversed its polarity hundreds of times in the Earth's history. This phenomenon is generally viewed as due to a Poisson nonstationary process. Here, the geomagnetic chron time length sequence for the past 166 Ma, is analyzed using a multifractal approach, based on "singularity analysis". The existence of a multifractal structure is the signature of the occurrence of "punctuated equilibrium", which can be read as an indication of a critical configuration of the geodynamo. The results obtained are compared with those from a prototypical model of a dynamical system, introduced by Seki & Ito [1993], and are discussed in the context of fluid motions within the Earth's outer liquid core.
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