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| Titel |
Entropy of geoelectrical time series in the natural time domain |
| VerfasserIn |
A. Ramírez-Rojas, L. Telesca, F. Angulo-Brown |
| 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 ; 11, no. 1 ; Nr. 11, no. 1 (2011-01-28), S.219-225 |
| Datensatznummer |
250009049
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| Publikation (Nr.) |
 copernicus.org/nhess-11-219-2011.pdf |
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| Zusammenfassung |
| Seismic electric signals (SES) have been considered precursors of strong
earthquakes, and, recently, their dynamics have been investigated within the
Natural Time Domain (NTD) (Varotsos et al., 2004). In this paper we apply
the NTD approach and the chaotic map signal analysis to two geoelectric time
series recorded in a seismically very active area of Mexico, where two
strong earthquakes, M=6.6 and M=7.4, occurred on 24 October 1993 and
14 September 1995, respectively. The low frequency geoelectric
signals measured display periods with dichotomic behavior. Our findings point out to
an increase of the correlation degree of the geoelectric signals before the
occurrence of strong earthquakes; furthermore, the power spectrum and
entropy in NTD are in good agreement with the results published in
literature. Our results were validated by the analysis of a chaotic map
simulated time series, which revealed the typical characteristics of
artificial noise. |
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