InSAR velocity field across the North Anatolian Fault (eastern Turkey): Implications for the loading and release of interseismic strain accumulation

Handle URI:
http://hdl.handle.net/10754/556397
Title:
InSAR velocity field across the North Anatolian Fault (eastern Turkey): Implications for the loading and release of interseismic strain accumulation
Authors:
Cakir, Ziyadin; Ergintav, Semih; Akoğlu, Ahmet M.; Çakmak, Rahşan; Tatar, Orhan; Meghraoui, Mustapha
Abstract:
We use the Persistent Scatterer Interferometric Synthetic Aperture Radar (PS-InSAR) technique with the European Space Agency's Envisat and ERS SAR data acquired on three neighboring descending tracks (T350, T078, and T307) to map the interseismic strain accumulation along a ~225 km long, NW-SE trending section of the North Anatolian Fault that ruptured during the 1939, 1942, and 1943 earthquakes in eastern Turkey. We derive a line-of-sight velocity map of the region with a high spatial resolution and accuracy which, together with the maps of earthquake surface ruptures, shed light on the style of continental deformation and the relationships between the loading and release of interseismic strain along segmented continental strike-slip faults. In contrast with the geometric complexities at the ground surface that appear to control rupture propagation of the 1939 event, modeling of the high-resolution PS-InSAR velocity field reveals a fairly linear and narrow throughgoing shear zone with an overall 20 ± 3 mm/yr slip rate above an unexpectedly shallow 7 ± 2 km locking depth. Such a shallow locking depth may result from the postseismic effects following recent earthquakes or from a simplified model that assumes a uniform degree of locking with depth on the fault. A narrow throughgoing shear zone supports the thick lithosphere model in which continental strike-slip faults are thought to extend as discrete shear zones through the entire crust. Fault segmentation previously reported from coseismic surface ruptures is thus likely inherited from heterogeneities in the upper crust that either preexist and/or develop during coseismic rupture propagation. The geometrical complexities that apparently persist for long periods may guide the dynamic rupture propagation surviving thousands of earthquake cycles.
KAUST Department:
Physical Sciences and Engineering (PSE) Division
Citation:
InSAR velocity field across the North Anatolian Fault (eastern Turkey): Implications for the loading and release of interseismic strain accumulation 2014, 119 (10):7934 Journal of Geophysical Research: Solid Earth
Publisher:
Wiley-Blackwell
Journal:
Journal of Geophysical Research: Solid Earth
Issue Date:
Oct-2014
DOI:
10.1002/2014JB011360
Type:
Article
ISSN:
21699313
Additional Links:
http://doi.wiley.com/10.1002/2014JB011360
Appears in Collections:
Articles; Physical Sciences and Engineering (PSE) Division

Full metadata record

DC FieldValue Language
dc.contributor.authorCakir, Ziyadinen
dc.contributor.authorErgintav, Semihen
dc.contributor.authorAkoğlu, Ahmet M.en
dc.contributor.authorÇakmak, Rahşanen
dc.contributor.authorTatar, Orhanen
dc.contributor.authorMeghraoui, Mustaphaen
dc.date.accessioned2015-06-04T12:23:11Zen
dc.date.available2015-06-04T12:23:11Zen
dc.date.issued2014-10en
dc.identifier.citationInSAR velocity field across the North Anatolian Fault (eastern Turkey): Implications for the loading and release of interseismic strain accumulation 2014, 119 (10):7934 Journal of Geophysical Research: Solid Earthen
dc.identifier.issn21699313en
dc.identifier.doi10.1002/2014JB011360en
dc.identifier.urihttp://hdl.handle.net/10754/556397en
dc.description.abstractWe use the Persistent Scatterer Interferometric Synthetic Aperture Radar (PS-InSAR) technique with the European Space Agency's Envisat and ERS SAR data acquired on three neighboring descending tracks (T350, T078, and T307) to map the interseismic strain accumulation along a ~225 km long, NW-SE trending section of the North Anatolian Fault that ruptured during the 1939, 1942, and 1943 earthquakes in eastern Turkey. We derive a line-of-sight velocity map of the region with a high spatial resolution and accuracy which, together with the maps of earthquake surface ruptures, shed light on the style of continental deformation and the relationships between the loading and release of interseismic strain along segmented continental strike-slip faults. In contrast with the geometric complexities at the ground surface that appear to control rupture propagation of the 1939 event, modeling of the high-resolution PS-InSAR velocity field reveals a fairly linear and narrow throughgoing shear zone with an overall 20 ± 3 mm/yr slip rate above an unexpectedly shallow 7 ± 2 km locking depth. Such a shallow locking depth may result from the postseismic effects following recent earthquakes or from a simplified model that assumes a uniform degree of locking with depth on the fault. A narrow throughgoing shear zone supports the thick lithosphere model in which continental strike-slip faults are thought to extend as discrete shear zones through the entire crust. Fault segmentation previously reported from coseismic surface ruptures is thus likely inherited from heterogeneities in the upper crust that either preexist and/or develop during coseismic rupture propagation. The geometrical complexities that apparently persist for long periods may guide the dynamic rupture propagation surviving thousands of earthquake cycles.en
dc.publisherWiley-Blackwellen
dc.relation.urlhttp://doi.wiley.com/10.1002/2014JB011360en
dc.rightsArchived with thanks to Journal of Geophysical Research: Solid Earthen
dc.titleInSAR velocity field across the North Anatolian Fault (eastern Turkey): Implications for the loading and release of interseismic strain accumulationen
dc.typeArticleen
dc.contributor.departmentPhysical Sciences and Engineering (PSE) Divisionen
dc.identifier.journalJournal of Geophysical Research: Solid Earthen
dc.eprint.versionPublisher's Version/PDFen
dc.contributor.institutionFaculty of Mines; Istanbul Technical University; Istanbul Turkeyen
dc.contributor.institutionKandilli Observatory and Earthquake Research Institute, Department of Geodesy; Boğaziçi University; Istanbul Turkeyen
dc.contributor.institutionTÜBİTAK MRC; Institute of Marine and Earth Sciences; Izmit Turkeyen
dc.contributor.institutionDepartment of Geology; Cumhuriyet University; Sivas Turkeyen
dc.contributor.institutionInstitut de Physique du Globe de Strasbourg; CNRS/University of Strasbourg; Strasbourg Franceen
kaust.authorAkoglu, Ahmeten
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