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| Titel |
Evidence for Tidal triggering on the earthquakes of the Hellenic Arc, Greece. |
| VerfasserIn |
G. Vergos, D. N. Arabelos, M. E. Contadakis |
| Konferenz |
EGU General Assembly 2012
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 14 (2012) |
| Datensatznummer |
250060329
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| Zusammenfassung |
| In this paper, continuing our program on investigating the potential tidal triggering
mechanism on different areas of Greece, we investigate the tidal triggering evidence on the
earthquakes of the seismic area of the Hellenic Arc using the Hi(stogram)Cum(ulation)
method, which was introduced recently by Cadicheanu, van Ruymbecke and Zhu (2007). We
analyze the series of the earthquakes occurred in the area which is confined by the longitudes
22o and 28o E and latitudes 34o and 36o N in the time period from 1964 up to 2010. In this
time period 15,959 shallow and of intermediate depth earthquakes with ML up to 6.0 and
1,471 deep earthquakes with ML up to 6.2 occurred. In accordance with our previous studies,
the result of the present analysis indicate that the monthly variation of the frequencies of
earthquake occurrence is in accordance with the period of the tidal lunar monthly and
semi-monthly (Mm and Mf) variations and the same happens with the corresponding daily
variations of the frequencies of earthquake occurrence with the diurnal luni-solar
(K1) and semidiurnal lunar (M2) tidal variations. In addition the confidence level
for the identification of such period accordance between earthquakes occurrence
frequency and tidal periods varies with seismic activity, i.e. the higher confidence level
corresponds to periods with stronger seismic activity. These results are in favor of a tidal
triggering process on earthquakes when the stress in the focal area is near the critical
level.
References
Cadicheanu, N., van Ruymbeke, M and Zhu P.,2007:Tidal triggering evidence of intermediate
depth earthquakes in Vrancea zone(Romania), NHESS 7,733-740. |
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