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Secondary Fault Activity of the North Anatolian Fault near Avcilar, Southwest of Istanbul: Evidence from SAR Interferometry Observations

Diao, Faqi and Walter, Thomas R. and Minati, Federico and Wang, Rongjiang and Costantini, Mario and Ergintav, Semih and Xiong, Xiong and Prats-Iraola, Pau (2016) Secondary Fault Activity of the North Anatolian Fault near Avcilar, Southwest of Istanbul: Evidence from SAR Interferometry Observations. Remote Sensing, 8 (10), pp. 1-17. Multidisciplinary Digital Publishing Institute (MDPI). DOI: 10.3390/rs8100846 ISSN 2072-4292

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Official URL: http://www.mdpi.com/2072-4292/8/10/846

Abstract

Strike-slip faults may be traced along thousands of kilometers, e.g., the San Andreas Fault (USA) or the North Anatolian Fault (Turkey). A closer look at such continental-scale strike faults reveals localized complexities in fault geometry, associated with fault segmentation, secondary faults and a change of related hazards. The North Anatolian Fault displays such complexities nearby the mega city Istanbul, which is a place where earthquake risks are high, but secondary processes are not well understood. In this paper, long-term persistent scatterer interferometry (PSI) analysis of synthetic aperture radar (SAR) data time series was used to precisely identify the surface deformation pattern associated with the faulting complexity at the prominent bend of the North Anatolian Fault near Istanbul city. We elaborate the relevance of local faulting activity and estimate the fault status (slip rate and locking depth) for the first time using satellite SAR interferometry (InSAR) technology. The studied NW-SE-oriented fault on land is subject to strike-slip movement at a mean slip rate of ~5.0 mm/year and a shallow locking depth of <1.0 km and thought to be directly interacting with the main fault branch, with important implications for tectonic coupling. Our results provide the first geodetic evidence on the segmentation of a major crustal fault with a structural complexity and associated multi-hazards near the inhabited regions of Istanbul, with similarities also to other major strike-slip faults that display changes in fault traces and mechanisms.

Item URL in elib:https://elib.dlr.de/107527/
Document Type:Article
Title:Secondary Fault Activity of the North Anatolian Fault near Avcilar, Southwest of Istanbul: Evidence from SAR Interferometry Observations
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Diao, FaqiChinese Academy of SciencesUNSPECIFIED
Walter, Thomas R.GFZUNSPECIFIED
Minati, Federicoe-GEOSUNSPECIFIED
Wang, RongjiangGFZUNSPECIFIED
Costantini, Marioe-GEOSUNSPECIFIED
Ergintav, SemihBoğazici UniversityUNSPECIFIED
Xiong, XiongChinese Academy of SciencesUNSPECIFIED
Prats-Iraola, PauUNSPECIFIEDUNSPECIFIED
Date:October 2016
Journal or Publication Title:Remote Sensing
Refereed publication:Yes
Open Access:Yes
Gold Open Access:Yes
In SCOPUS:Yes
In ISI Web of Science:No
Volume:8
DOI :10.3390/rs8100846
Page Range:pp. 1-17
Publisher:Multidisciplinary Digital Publishing Institute (MDPI)
Series Name:Remote Sensing
ISSN:2072-4292
Status:Published
Keywords:fault activity; interferometric synthetic aperture radar (InSAR); persistent scatterer interferometry (PSI); Istanbul; seismic hazard assessment; North Anatolian fault
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Erdbeobachtung
DLR - Research theme (Project):R - Vorhaben Flugzeug-SAR
Location: Oberpfaffenhofen
Institutes and Institutions:Microwaves and Radar Institute
Microwaves and Radar Institute > SAR Technology
Deposited By: Prats, Dr. Pau
Deposited On:14 Nov 2016 07:11
Last Modified:21 Sep 2019 05:06

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