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| Titel |
Recent seismicity detection increase in the Santorini volcanic island complex |
| VerfasserIn |
G. Chouliaras, G. Drakatos, K. Makropoulos, N. S. Melis |
| 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 ; 12, no. 4 ; Nr. 12, no. 4 (2012-04-02), S.859-866 |
| Datensatznummer |
250010687
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| Publikation (Nr.) |
 copernicus.org/nhess-12-859-2012.pdf |
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| Zusammenfassung |
Santorini is the most active volcanic complex in the South Aegean
Volcanic Arc. To improve the seismological network detectability of the
seismicity in this region, the Institute of Geodynamics of the National
Observatory of Athens (NOA) recently installed 4 portable seismological
stations supplementary to the 3 permanent stations operating in the region.
The addition of these stations has significantly improved the detectability
and reporting of the local seismic activity in the NOA instrumental
seismicity catalogue.
In this study we analyze quantitatively the seismicity of the Santorini
volcanic complex. The results indicate a recent significant reporting
increase mainly for events of small magnitude and an increase in the
seismicity rate by more than 100%. The mapping of the statistical
significance of the rate change with the z-value method reveals that the
rate increase exists primarily in the active fault zone perpendicular to the
extensional tectonic stress regime that characterizes this region.
The spatial distribution of the b-value around the volcanic complex
indicates a low b-value distribution parallel to the extensional stress
field, while the b-value cross section of the volcanic complex indicates
relatively high b-values under the caldera and a significant b-value
decrease with depth.
These results are found to be in general agreement with the results from
other volcanic regions and they encourage further investigations concerning
the seismic and volcanic hazard and risk estimates for the Santorini
volcanic complex using the NOA earthquake catalogue. |
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