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Recent seismicity detection increase in the Santorini volcanic island complex
Copyright policy )Recent seismicity detection increase in the Santorini volcanic island complex
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. <br><br> 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. <br><br> 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. <br><br> 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.
Microsoft Academic Graph classification: Volcanic hazards Induced seismicity Spatial distribution Caldera geography geography.geographical_feature_category Volcanic arc Geodynamics Stress field Volcano Geology Seismology
Library of Congress Subject Headings: lcsh:TD1-1066 lcsh:Environmental technology. Sanitary engineering lcsh:Environmental sciences lcsh:GE1-350 lcsh:QE1-996.5 lcsh:Geography. Anthropology. Recreation lcsh:Geology lcsh:G
General Earth and Planetary Sciences
General Earth and Planetary Sciences
Microsoft Academic Graph classification: Volcanic hazards Induced seismicity Spatial distribution Caldera geography geography.geographical_feature_category Volcanic arc Geodynamics Stress field Volcano Geology Seismology
Library of Congress Subject Headings: lcsh:TD1-1066 lcsh:Environmental technology. Sanitary engineering lcsh:Environmental sciences lcsh:GE1-350 lcsh:QE1-996.5 lcsh:Geography. Anthropology. Recreation lcsh:Geology lcsh:G
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Citations provided by BIP!Popularity provided by BIP!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. <br><br> 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. <br><br> 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. <br><br> 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.