A unified approach of catastrophic events

Nikolopoulos, S; Kapiris, P; Karamanos, K; Eftaxias, K

dc.contributor.author	Nikolopoulos, S	en
dc.contributor.author	Kapiris, P	en
dc.contributor.author	Karamanos, K	en
dc.contributor.author	Eftaxias, K	en
dc.date.accessioned	2014-03-01T01:19:51Z
dc.date.available	2014-03-01T01:19:51Z
dc.date.issued	2004	en
dc.identifier.issn	1561-8633	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/15727
dc.relation.uri	http://www.scopus.com/inward/record.url?eid=2-s2.0-11244341069&partnerID=40&md5=a4a4ce1441203b584ba3642ec41513b1	en
dc.subject.classification	Geosciences, Multidisciplinary	en
dc.subject.classification	Meteorology & Atmospheric Sciences	en
dc.subject.classification	Water Resources	en
dc.subject.other	catastrophic event	en
dc.subject.other	natural hazard	en
dc.subject.other	statistical analysis	en
dc.title	A unified approach of catastrophic events	en
heal.type	journalArticle	en
heal.language	English	en
heal.publicationDate	2004	en
heal.abstract	Although there is an accumulated charge of theoretical, computational, and numerical work, like catastrophe theory, bifurcation theory, stochastic and deterministic chaos theory, there is an important feeling that these matters do not completely cover the physics of real catastrophic events. Recent studies have suggested that a large variety of complex processes, including earthquakes, heartbeats, and neuronal dynamics, exhibits statistical similarities. Here we are studying in terms of complexity and non linear techniques whether isomorphic signatures emerged indicating the transition from the normal state to the both geological and biological shocks. In the last 15 years, the study of Complex Systems has emerged as a recognized field in its own right, although a good definition of what a complex system is, actually is eluded. A basic reason for our interest in complexity is the striking similarity in behaviour close to irreversible phase transitions among systems that are otherwise quite different in nature. It is by now recognized that the pre-seismic electromagnetic time-series contain valuable information about the earthquake preparation process, which cannot be extracted without the use of important computational power, probably in connection with computer Algebra techniques. This paper presents an analysis, the aim of which is to indicate the approach of the global instability in the prefocal area. Non-linear characteristics are studied by applying two techniques, namely the Correlation Dimension Estimation and the Approximate Entropy. These two non-linear techniques present coherent conclusions, and could cooperate with an independent fractal spectral analysis to provide a detection concerning the emergence of the nucleation phase of the impending catastrophic event. In the context of similar mathematical background, it would be interesting to augment this description of pre-seismic electromagnetic anomalies in order to cover biological crises, namely, epileptic seizure and heart failure. © European Geosciences Union 2004.	en
heal.publisher	EUROPEAN GEOSCIENCES UNION	en
heal.journalName	Natural Hazards and Earth System Science	en
dc.identifier.isi	ISI:000225976300001	en
dc.identifier.volume	4	en
dc.identifier.issue	5-6	en
dc.identifier.spage	615	en
dc.identifier.epage	631	en