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| Titel |
A unified approach of catastrophic events |
| VerfasserIn |
S. Nikolopoulos, P. Kapiris, K. Karamanos, K. Eftaxias |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1561-8633
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| Digitales Dokument |
URL |
| Erschienen |
In: Natural Hazards and Earth System Science ; 4, no. 5/6 ; Nr. 4, no. 5/6 (2004-10-14), S.615-631 |
| Datensatznummer |
250001377
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| Publikation (Nr.) |
 copernicus.org/nhess-4-615-2004.pdf |
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| Zusammenfassung |
| 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
pre-focal 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. |
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