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| Titel |
Unified approach to catastrophic events: from the normal state to geological or biological shock in terms of spectral fractal and nonlinear analysis |
| VerfasserIn |
K. A. Eftaxias, P. G. Kapiris, G. T. Balasis, A. Peratzakis, K. Karamanos, J. Kopanas, G. Antonopoulos, K. D. Nomicos |
| 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 ; 6, no. 2 ; Nr. 6, no. 2 (2006-04-03), S.205-228 |
| Datensatznummer |
250003399
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| Publikation (Nr.) |
 copernicus.org/nhess-6-205-2006.pdf |
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| Zusammenfassung |
| An important question in geophysics is whether earthquakes (EQs) can be
anticipated prior to their occurrence. Pre-seismic electromagnetic (EM)
emissions provide a promising window through which the dynamics of EQ
preparation can be investigated. However, the existence of precursory
features in pre-seismic EM emissions is still debatable: in principle, it is
difficult to prove associations between events separated in time, such as EQs
and their EM precursors. The scope of this paper is the investigation of the
pre-seismic EM activity in terms of complexity. A basic reason for our
interest in complexity is the striking similarity in behavior close to
irreversible phase transitions among systems that are otherwise quite
different in nature. Interestingly, theoretical studies (Hopfield, 1994; Herz
and Hopfield 1995; Rundle et al., 1995; Corral et al., 1997) suggest that the
EQ dynamics at the final stage and neural seizure dynamics should have many
similar features and can be analyzed within similar mathematical frameworks.
Motivated by this hypothesis, we evaluate the capability of linear and
non-linear techniques to extract common features from brain electrical
activities and pre-seismic EM emissions predictive of epileptic seizures and
EQs respectively. The results suggest that a unified theory may exist for the
ways in which firing neurons and opening cracks organize themselves to
produce a large crisis, while the preparation of an epileptic shock or a
large EQ can be studied in terms of ''Intermittent Criticality''. |
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