Shallow Creep Along the 1999 Izmit Earthquake Rupture (Turkey) From GPS and High Temporal Resolution Interferometric Synthetic Aperture Radar Data (2011–2017)

Gokhan Aslan*, Cécile Lasserre, Ziyadin Cakir, Semih Ergintav, Seda Özarpaci, Ugur Dogan, Roger Bilham, François Renard

*Bu çalışma için yazışmadan sorumlu yazar

Araştırma sonucu: ???type-name???Makalebilirkişi

44 Atıf (Scopus)

Özet

Characterizing the spatiotemporal evolution of creep is essential to constrain fault slip budget and understand creep mechanism. Studies based on interferometric synthetic aperture radar and Global Positioning System (GPS) satellite observations until 2012 have shown that the central segment of the 17 August 1999 Mw 7.4 Izmit earthquake on the North Anatolian Fault began slipping aseismically following the event. In the present study, we combine new interferometric synthetic aperture radar time series, based on TerraSAR-X and Sentinel 1A/B radar images acquired over the period 2011–2017, with near-field GPS measurement campaigns performed every 6 months from 2014 to 2016. The mean velocity fields reveal that creep on the central segment of the 1999 Izmit fault rupture continues to decay, more than 19 years after the earthquake, in overall agreement with models of postseismic afterslip decaying logarithmically with time for a long period of time. Along the fault section that experienced supershear velocity rupture during the Izmit earthquake creep continues with a rate up to ~ 8 mm/year. A significant transient accelerating creep is detected in December 2016 on the Sentinel-1 time series, near the maximum creep rate location, associated with a total surface slip of 10 mm released in 1 month only. Additional analyses of the vertical velocity fields show a persistent subsidence on the hanging wall block of the Golcuk normal fault that also ruptured during the Izmit earthquake. Our results demonstrate that afterslip processes along the North Anatolian Fault east-southeast of Istanbul are more complex than previously proposed as they vary spatiotemporally along the fault.

Orijinal dilİngilizce
Sayfa (başlangıç-bitiş)2218-2236
Sayfa sayısı19
DergiJournal of Geophysical Research: Solid Earth
Hacim124
Basın numarası2
DOI'lar
Yayın durumuYayınlandı - Şub 2019

Bibliyografik not

Publisher Copyright:
©2019. American Geophysical Union. All Rights Reserved.

Finansman

SAR (TerraSAR-X) data sets were obtained through the GSNL Marmara Region Permanent Supersite (available at http://geo-gsnl.org/supersites/permanent-supersites/marmara-region-supersite/). Processing of Sentinel 1A/B images is performed at TUBITAK ULAKBIM, High Performance and Grid Computing Center (TRUBA resources). This study received funding from the Norwegian Research Council, project HADES, grant 250661 to F. R., TUBITAK project 113Y102 to Z. C., and Bogaziçi University Research Fund Grant 12200 to S. E. This is part of the PhD dissertation of Gokhan Aslan who is supported by the French Embassy in Turkey (Bourse Etudes scholarship program 889075G), University Grenoble Alpes IDEX project scholarship, Université Grenoble Alpes LabeX OSUG@2020 project to C. L., and CMIRA scholarship program provided by the Rhone-Alpes Region. The creepmeters were supported by NSF EAR 1622720. We thank B. Rousset for discussions and help in the conception of Figure. We also thank the editor P. Tregoning and two anonymous reviewers for the constructive comments. SAR (TerraSAR‐X) data sets were obtained through the GSNL Marmara Region Permanent Supersite (available at http://geo‐gsnl.org/supersites/ permanent‐supersites/marmara‐ region‐supersite/). Processing of Sentinel 1A/B images is performed at TUBITAK ULAKBIM, High Performance and Grid Computing Center (TRUBA resources). This study received funding from the Norwegian Research Council, project HADES, grant 250661 to F. R., TUBITAK project 113Y102 to Z. C., and Bogaziçi University Research Fund Grant 12200 to S. E. This is part of the PhD dissertation of Gokhan Aslan who is supported by the French Embassy in Turkey (Bourse Etudes scholarship program 889075G), University Grenoble Alpes IDEX project scholar ship, Université Grenoble Alpes LabeX OSUG@2020 project to C. L., and CMIRA scholarship program provided by the Rhone‐Alpes Region. The creep- meters were supported by NSF EAR 1622720. We thank B. Rousset for dis cussions and help in the conception of Figure . We also thank the editor P. Tregoning and two anonymous reviewers for the constructive comments.

FinansörlerFinansör numarası
CMIRA
French Embassy in Turkey889075G
Rhone-Alpes Region
Rhone‐Alpes Region
Université Grenoble Alpes LabeX OSUG@2020
National Science FoundationEAR 1622720
Université Grenoble Alpes
Türkiye Bilimsel ve Teknolojik Araştırma Kurumu
Boğaziçi Üniversitesi12200
Norges Forskningsråd250661, 113Y102

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