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| Titel |
Stress distribution and seismicity patterns of the 2011 seismic swarm in the Messinia basin, (South-Western Peloponnesus), Greece |
| VerfasserIn |
G. Chouliaras, G. Drakatos, K. Pavlou, K. Makropoulos |
| 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 ; 13, no. 1 ; Nr. 13, no. 1 (2013-01-10), S.45-51 |
| Datensatznummer |
250017529
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| Publikation (Nr.) |
 copernicus.org/nhess-13-45-2013.pdf |
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| Zusammenfassung |
In this investigation we examine the local stress field and the seismicity
patterns associated with the 2011–2012 seismicity swarm in the Messinia
basin, south-western Peloponnesus, Greece, using the seismological data of
the National Observatory of Athens (NOA). During this swarm more than 2000
events were recorded in a 12 month period by the Hellenic Unified
Seismological Network (HUSN) and also by the additional local installation
of four portable broadband seismographic stations by NOA.
The results indicate a Gaussian distribution of swarm activity and the
development of a seismicity cluster in a pre-existing seismic gap within the
Messinia basin. Centroid Moment Tensor solutions demonstrate a normal fault
trending northwest–southeast and dipping to the southwest primarily due to
an extensional stress field. During this seismicity swarm an epicentre
migration of the three largest shocks is observed, from one end of the
rupture zone in the north-western part of the cluster, towards the other
edge of the rupture in the south-eastern part of the cluster. This migration
is found to follow the Coulomb failure criterion that predicts the
advancement and retardation of the stress field and the patterns of
increases and decreases of the seismicity rate (b-value) of the
frequency–magnitude relation. |
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