Extent and distribution of aseismic slip on the Ismetpaşa segment of the North Anatolian Fault (Turkey) from Persistent Scatterer InSAR

Handle URI:
http://hdl.handle.net/10754/346985
Title:
Extent and distribution of aseismic slip on the Ismetpaşa segment of the North Anatolian Fault (Turkey) from Persistent Scatterer InSAR
Authors:
Cetin, Esra; Cakir, Ziyadin; Meghraoui, Mustapha; Ergintav, Semih; Akoglu, Ahmet M.
Abstract:
We use the Persistent Scatterer InSAR (PSI) technique with elastic dislocation models and geology along the creeping section of the North Anatolian Fault (NAF) at Ismetpaşa, to map and deduce the velocity field and the aseismic slip distribution. Revealing the spatiotemporal nature of the creep helped us associate the creep with potential lithological controls, hence providing a new perspective to better understand the underlying causes and mechanisms. The PSI analysis of Envisat ASAR images between 2003 and 2010 reveals a clear picture of surface creep along the fault and a new interseismic velocity field transitioning gradually between the creeping and the locked fault sections. The creep rate is found to fluctuate along a 100 km long section of the fault in a manner similar to that along the Hayward fault, reaching a maximum of ∼20±2 mm/yr, close to the far field plate velocity (∼25±1.5 mm/yr). At Ismetpaşa, it is in the range of 8±2 mm/yr, consistent with the previous geodetic observations. The creeping section appears to extend 30 km further east than those previously reported. Modeling of the PSI data reveals a heterogeneous creep distribution at depth with two main patches confined mostly to the uppermost 5 km portion of the seismogenic crust, releasing annually 6.2 × 1016 Nm (Mw=5.1) geodetic moment. Our analysis combined with previous studies suggests that creep might have commenced as postseismic deformation following the 1944 earthquake and has evolved to stable fault creep with time. There is a correlation between aseismic surface creep and the geology along the fault as it is in major part associated to rocks with low frictional strength such as the andesitic-basaltic, limestone, and serpentine bodies within the fault zone. © 2014. American Geophysical Union. All Rights Reserved.
KAUST Department:
Physical Sciences and Engineering (PSE) Division
Citation:
Extent and distribution of aseismic slip on the Ismetpaşa segment of the North Anatolian Fault (Turkey) from Persistent Scatterer InSAR 2014, 15 (7):2883 Geochemistry, Geophysics, Geosystems
Publisher:
American Geophysical Union
Journal:
Geochemistry, Geophysics, Geosystems
Issue Date:
Jul-2014
DOI:
10.1002/2014GC005307
Type:
Article
ISSN:
15252027
Additional Links:
http://doi.wiley.com/10.1002/2014GC005307
Appears in Collections:
Articles; Physical Sciences and Engineering (PSE) Division

Full metadata record

DC FieldValue Language
dc.contributor.authorCetin, Esraen
dc.contributor.authorCakir, Ziyadinen
dc.contributor.authorMeghraoui, Mustaphaen
dc.contributor.authorErgintav, Semihen
dc.contributor.authorAkoglu, Ahmet M.en
dc.date.accessioned2015-03-23T11:15:52Zen
dc.date.available2015-03-23T11:15:52Zen
dc.date.issued2014-07en
dc.identifier.citationExtent and distribution of aseismic slip on the Ismetpaşa segment of the North Anatolian Fault (Turkey) from Persistent Scatterer InSAR 2014, 15 (7):2883 Geochemistry, Geophysics, Geosystemsen
dc.identifier.issn15252027en
dc.identifier.doi10.1002/2014GC005307en
dc.identifier.urihttp://hdl.handle.net/10754/346985en
dc.description.abstractWe use the Persistent Scatterer InSAR (PSI) technique with elastic dislocation models and geology along the creeping section of the North Anatolian Fault (NAF) at Ismetpaşa, to map and deduce the velocity field and the aseismic slip distribution. Revealing the spatiotemporal nature of the creep helped us associate the creep with potential lithological controls, hence providing a new perspective to better understand the underlying causes and mechanisms. The PSI analysis of Envisat ASAR images between 2003 and 2010 reveals a clear picture of surface creep along the fault and a new interseismic velocity field transitioning gradually between the creeping and the locked fault sections. The creep rate is found to fluctuate along a 100 km long section of the fault in a manner similar to that along the Hayward fault, reaching a maximum of ∼20±2 mm/yr, close to the far field plate velocity (∼25±1.5 mm/yr). At Ismetpaşa, it is in the range of 8±2 mm/yr, consistent with the previous geodetic observations. The creeping section appears to extend 30 km further east than those previously reported. Modeling of the PSI data reveals a heterogeneous creep distribution at depth with two main patches confined mostly to the uppermost 5 km portion of the seismogenic crust, releasing annually 6.2 × 1016 Nm (Mw=5.1) geodetic moment. Our analysis combined with previous studies suggests that creep might have commenced as postseismic deformation following the 1944 earthquake and has evolved to stable fault creep with time. There is a correlation between aseismic surface creep and the geology along the fault as it is in major part associated to rocks with low frictional strength such as the andesitic-basaltic, limestone, and serpentine bodies within the fault zone. © 2014. American Geophysical Union. All Rights Reserved.en
dc.publisherAmerican Geophysical Unionen
dc.relation.urlhttp://doi.wiley.com/10.1002/2014GC005307en
dc.rightsArchived with thanks to Geochemistry, Geophysics, Geosystems. © 2014. American Geophysical Union. All Rights Reserved.en
dc.titleExtent and distribution of aseismic slip on the Ismetpaşa segment of the North Anatolian Fault (Turkey) from Persistent Scatterer InSARen
dc.typeArticleen
dc.contributor.departmentPhysical Sciences and Engineering (PSE) Divisionen
dc.identifier.journalGeochemistry, Geophysics, Geosystemsen
dc.eprint.versionPublisher's Version/PDFen
dc.contributor.institutionDepartment of Geology; Istanbul Technical University; Istanbul Turkeyen
dc.contributor.institutionDepartment of Geology; Istanbul Technical University; Istanbul Turkeyen
dc.contributor.institutionEOST-UMR 7516, Institut de Physique du Globe de Strasbourg; Strasbourg Franceen
dc.contributor.institutionDepartment of Geodesy; Kandilli Observatory and Earthquake Research Institute, Bogaziçi University; Istanbul Turkeyen
dc.contributor.affiliationKing Abdullah University of Science and Technology (KAUST)en
kaust.authorAkoglu, Ahmeten
All Items in KAUST are protected by copyright, with all rights reserved, unless otherwise indicated.