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Publication . Article . Other literature type . 2018

Stress distribution and seismicity patterns of the 2011 seismic swarm in the Messinia basin, (South-Western Peloponnesus), Greece

G. Chouliaras; G. Drakatos; Kyriaki Pavlou; Konstantinos Makropoulos;
Open Access   English  
Published: 27 Sep 2018
Abstract
Abstract. 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.
Subjects by Vocabulary

Microsoft Academic Graph classification: Swarm behaviour Induced seismicity Normal fault Stress distribution Structural basin Stress field Seismic gap Seismology Epicenter Geology

Library of Congress Subject Headings: lcsh:Environmental technology. Sanitary engineering lcsh:TD1-1066 lcsh:Geography. Anthropology. Recreation lcsh:G lcsh:Environmental sciences lcsh:GE1-350 lcsh:Geology lcsh:QE1-996.5

Subjects

General Earth and Planetary Sciences

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Funded by
EC| EPOS
Project
EPOS
European Plate Observing System
  • Funder: European Commission (EC)
  • Project Code: 262229
  • Funding stream: FP7 | SP4 | INFRA
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