Natural Hazards and Earth System Science www.nat-hazards-earth-syst-sci.net 1561-8633 1684-9981 8 4 2008 10.5194/nhess-8-657-2008 http://www.nat-hazards-earth-syst-sci.net/8/657/2008/ http://www.nat-hazards-earth-syst-sci.net/8/657/2008/nhess-8-657-2008.html http://www.nat-hazards-earth-syst-sci.net/8/657/2008/nhess-8-657-2008.pdf 657 669 2008-07-11 Evidence of fractional-Brownian-motion-type asperity model for earthquake generation in candidate pre-seismic electromagnetic emissions K. Eftaxias ceftax@phys.uoa.gr Y. Contoyiannis G. Balasis K. Karamanos J. Kopanas G. Antonopoulos G. Koulouras C. Nomicos Section of Solid State Physics, Department of Physics, University of Athens, Panepistimiopolis, Zografos, 15784, Athens, Greece Section of Nuclear and Elementary Particle Physics, Department of Physics, University of Athens, Panepistimiopolis, Zografos, 15784, Athens, Greece Institute for Space Applications and Remote Sensing, National Observatory of Athens, Metaxa and Vas. Pavlou, Palea Penteli, 15236, Athens, Greece Department of Electronics, Technological Educational Institute of Athens, Ag. Spyridonos, Egaleo, 12210, Athens, Greece Many aspects of earthquake generation still escape our full understanding. Observations of electromagnetic emissions preceding significant earthquakes provide one of the few cases of premonitory events that are possibly related to a subsequent earthquake. Understanding the factors that control electromagnetic precursors generation seems to be important for determining how significant earthquakes nucleate. Here we report the results of a comprehensive study of the appearance of individual patterns in candidate electromagnetic precursors possibly indicating the breaking of backbone of large and strong asperities that sustain the activated fault. The search of precursory patterns is mainly based on well documented scaling properties of fault surface topology. 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