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| Titel |
Correlation between seismicity and barometric tidal exalting |
| VerfasserIn |
D. N. Arabelos, G. Asteriadis, A. Bloutsos, M. E. Contadakis, S. D. Spatalas |
| 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 ; 8, no. 5 ; Nr. 8, no. 5 (2008-10-21), S.1129-1137 |
| Datensatznummer |
250005775
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| Publikation (Nr.) |
 copernicus.org/nhess-8-1129-2008.pdf |
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| Zusammenfassung |
| Changes of barometric pressure in the area of Thessaloniki in Northern Greece
were studied by analyzing a sample of 31 years of hourly measurements. The
results of this analysis on the periodicities of tidal components are
expressed in terms of amplitude and phases variability. An earlier
investigation revealed a detectable correlation between the exalting of the
amplitude parameters of the tidal waves with strong seismic events. A problem
of this work was that we had compared the tidal parameters resulting from the
analysis of data covering the period of one year with instantaneous seismic
events, although the earthquake is the final result of a tectonic process of
the upper lithosphere. Consequently, in order to increase the resolution of
our method we had analyzed our data in groups of 3-months extent and the
resulted amplitudes were compared with seismicity index for corresponding
time periods. A stronger correlation was found in the last case. However, the
estimation of tidal parameters in this case was restricted to short period
(from one day down to eight hours) constituents. Therefore, a new analysis
was performed, retaining the one-year length of each data block but shifting
the one year window by steps of three months from the beginning to the end of
the 31 years period. This way, we are able to estimate again tidal parameters
ranging from periods of one year (Sa) down to eight hours (M3). The resulting
correlation between these tidal parameters with a cumulative seismicity index
for corresponding time intervals was remarkably increased. |
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