An active extensional deformation example: 19 May 2011 Simav earthquake (Mw=5.8), Western Anatolia, Turkey

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dc.authoridDemirci, Alper/0000-0002-8710-6232
dc.authoridBEKLER, TOLGA/0000-0002-9475-8626
dc.authoridPINAR, Ali/0000-0002-2641-7344
dc.contributor.authorDemirci, Alper
dc.contributor.authorÖzden, Süha
dc.contributor.authorBekler, Tolga
dc.contributor.authorKalafat, Dogan
dc.contributor.authorPinar, Ali
dc.date.accessioned2025-01-27T21:00:14Z
dc.date.available2025-01-27T21:00:14Z
dc.date.issued2015
dc.departmentÇanakkale Onsekiz Mart Üniversitesi
dc.description.abstractThe Simav Earthquake that occurred on 19 May 2011 in western Turkey was investigated on the basis of seismological data and geological observations. Approximately WNW-ESE trending surface ruptures were observed on the Simav Fault. The focal mechanism parameters of the earthquake (Mw = 5.8) and its aftershocks (Mw > 3.5) were estimated using time-domain moment tensor inversion. A total of 2245 events were located with Geiger's conventional absolute location method then relocated using the double difference (DD) algorithm. The calculated locations at a depths between 2 and 16 km were found to be consistent with Coulomb stress variation in the area. Average variance reduction (VR) of the solutions was calculated as similar to 70%. The focal parameters of strike dip and slip of the main shock, occurring at a depth of 11 km dipping towards the NNE, were estimated at 277, 62 and -92, respectively. The most striking indication of the study is that the area is dominated by normal faults with mainly WNW-ESE trends. It is also concluded that earthquakes in the region are caused by an active and regional NNE-SSW (N 12 degrees E) trending (sigma(3) axis) extension regime. The mean stress ratio is 0.80, indicating a triaxial stress state. This extension is probably associated with a slab-pull force and /or roll-back due to the complex subduction process of the African Plate beneath Anatolian block along both the Hellenic and Cyprus arcs in the eastern Mediterranean region.
dc.description.sponsorshipScientific and Technological Research Council of Turkey (TUBITAK) [109Y103]
dc.description.sponsorshipThis study was supported by the Scientific and Technological Research Council of Turkey (TUBITAK), project no. 109Y103. The authors would like to thank TUBITAK and KOERI Earthquake Monitoring Centre for providing seismological data. Some figures were plotted using GMT (Generic Mapping Tools) code (Wessel and Smith 1995). The modelling for this study was carried out at the Earthquake Monitoring and Data Processing Laboratory (DEIVIL) in the Department of Geophysical Engineering at Canakkale Onsekiz Mart University. Dr Y L Ekinci, C Yigit and G Lee are thanked for editing and proofreading the paper. Dr T Komut, the editorial team of the jornal and two anonymous reviewers are thanked for their valuable suggestions.
dc.identifier.doi10.1088/1742-2132/12/4/552
dc.identifier.endpage565
dc.identifier.issn1742-2132
dc.identifier.issn1742-2140
dc.identifier.issue4
dc.identifier.scopus2-s2.0-84936936102
dc.identifier.scopusqualityQ2
dc.identifier.startpage552
dc.identifier.urihttps://doi.org/10.1088/1742-2132/12/4/552
dc.identifier.urihttps://hdl.handle.net/20.500.12428/26971
dc.identifier.volume12
dc.identifier.wosWOS:000357716700002
dc.identifier.wosqualityQ4
dc.indekslendigikaynakWeb of Science
dc.indekslendigikaynakScopus
dc.language.isoen
dc.publisherOxford Univ Press
dc.relation.ispartofJournal of Geophysics and Engineering
dc.relation.publicationcategoryinfo:eu-repo/semantics/openAccess
dc.rightsinfo:eu-repo/semantics/closedAccess
dc.snmzKA_WoS_20250125
dc.subjectSimav
dc.subjectdouble-difference
dc.subjectfocal mechanism
dc.subjectsurface rupture
dc.subjecttime-domain moment tensor inversion
dc.subjectWestern Turkey
dc.titleAn active extensional deformation example: 19 May 2011 Simav earthquake (Mw=5.8), Western Anatolia, Turkey
dc.typeArticle

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