Late Cenozoic stress states around the Bolu Basin along the North Anatolian Fault, NW Turkey

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dc.authoridKavak, Kaan/0000-0002-8216-5890
dc.contributor.authorÖzden, Süha
dc.contributor.authorOver, Semir
dc.contributor.authorKavak, Kaan Sevki
dc.contributor.authorInal, Serife Sevinc
dc.date.accessioned2025-01-27T21:01:45Z
dc.date.available2025-01-27T21:01:45Z
dc.date.issued2008
dc.departmentÇanakkale Onsekiz Mart Üniversitesi
dc.description.abstractThis study defines the Late Cenozoic stress regimes acting around the Bolu Basin along the North Anatolian Fault in northwestern Turkey. The inferred regional stress regime, obtained from the inversion of measured fault-slip vectors as well as focal mechanism solutions, is significant and induces the right-lateral displacement of the North Anatolian Fault. The field observations have also revealed extensional structures in and around the Bolu Basin. These extensional structures can be interpreted as either a local effect of the regional trainstensional stress regime or as the result of the interaction of the fault geometries of the dextral Duzce Fault and the southern escarpment of the North Anatolian Fault, bordering the Bolu Basin in the north and in the south, respectively. The inversion of slip vectors measured on fault planes indicates that a strike-slip stress regime with consistent NW- and NE-trencling sigma(Hmax) (sigma(1)) and sigma(Hmin) (sigma(3)) axes is dominant. Stress ratio (R) values provided by inversion of slip vectors measured on both major and minor faults and field observations show significant variations of principal stress magnitudes within the strike-slip stress regime resulting in older transpression to younger transtension. These two stress states, producing dextral displacement along NAF, are coaxial with a consistent NE-trending sigma(3) axis. The earthquake focal mechanism inversions confirm that the transtensional stress regime has continued into recent times, having identical horizontal stress axis directions, characterized by NW and NE-trencling sigma(1) and sigma(3) axes, respectively. A locally consistent NE-trending extensional, normal faulting regime is also seen in the Bolu Basin. The stress-tensor change within the strike-slip stress regime can be explained by variations in horizontal stress magnitudes that probably occurred in Quaternary times as a result of the westward extrusion of the Anatolian block. (C) 2008 Elsevier Ltd. All rights reserved.
dc.identifier.doi10.1016/j.jog.2008.04.004
dc.identifier.endpage62
dc.identifier.issn0264-3707
dc.identifier.issue1-2
dc.identifier.scopus2-s2.0-46249124280
dc.identifier.scopusqualityQ2
dc.identifier.startpage48
dc.identifier.urihttps://doi.org/10.1016/j.jog.2008.04.004
dc.identifier.urihttps://hdl.handle.net/20.500.12428/27176
dc.identifier.volume46
dc.identifier.wosWOS:000258051900005
dc.identifier.wosqualityQ2
dc.indekslendigikaynakWeb of Science
dc.indekslendigikaynakScopus
dc.language.isoen
dc.publisherPergamon-Elsevier Science Ltd
dc.relation.ispartofJournal of Geodynamics
dc.relation.publicationcategoryinfo:eu-repo/semantics/openAccess
dc.rightsinfo:eu-repo/semantics/closedAccess
dc.snmzKA_WoS_20250125
dc.subjectfault-slip vector
dc.subjectinversion
dc.subjectLate Cenozoic
dc.subjectstress states
dc.subjecttranstensional
dc.subjectBolu Basin
dc.subjectNorth Anatolian Fault
dc.titleLate Cenozoic stress states around the Bolu Basin along the North Anatolian Fault, NW Turkey
dc.typeArticle

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