CHARACTERISTICS OF SEISMIC EXCITATIONS IN CORINTH GULF (GREECE)
Abstract
Seismic excitations occur as mainshock-aftershock sequences (MS-AS) encompassing a strong event called mainshock with the largest magnitude in the set, or as earthquake swarms (ES) when a distinctive main event is absent. In regions as the gulf of Corinth, where active deformation is manifested with frequent seismicity bursts, it is important to distinguish MS-AS from ES for providing information on the physical process of earthquake generation and contribute to the seismic hazard assessment. For this purpose, a highly accurate local earthquake catalogue was compiled and an effort was made for clusters identification after establishing certain criteria based on spatio-temporal seismicity properties. The skewness and kurtosis of moment release history were calculated considering the normalized time of every event in a cluster since the starting time of the cluster and its seismic moment. For MS-AS we found large positive values for skewness and kurtosis contrary to ES that exhibit negative to low positive values for skewness and even lower values for kurtosis.
In order to verify the classification of clusters, the b-value, the spatial size and the number of events of each cluster were examined. Finally, a scaling relation between the length of the rupture zone and magnitude derived for the MS-AS sequences.
Article Details
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Mesimeri, M., Karakostas, V., Papadimitriou, E., & Tsaklidis, G. (2016). CHARACTERISTICS OF SEISMIC EXCITATIONS IN CORINTH GULF (GREECE). Bulletin of the Geological Society of Greece, 50(3), 1379–1388. https://doi.org/10.12681/bgsg.11851
- Section
- Seismology
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