Surface Creep Along the 1999 Izmit Earthquake’s Rupture (Turkey) from InSAR, GPS and Terrestrial LIDAR

Tuesday, 15 December 2015
Poster Hall (Moscone South)
Ziyadin Cakir1, Gokhan Aslan2, Ugur Dogan3, Sinasi Kaya4, Semih Ergintav5, Deniz Oz3 and Mehmet F Celik4, (1)Istanbul Technical Univ, Geology, Istanbul, Turkey, (2)Istanbul Technical Univ, Eurasia Earth. Sci. Ins., Istanbul, Turkey, (3)Yildiz Technical University, Geodesy, Istanbul, Turkey, (4)Istanbul Technical Univ, Geomatics, Istanbul, Turkey, (5)Bogazici University, Kandilli Observatory and ERI.- Geodesy, Istanbul, Turkey
Previous studies based on InSAR and GPS observations have shown that the Izmit-Akyazı segment of the North Anatolian Fault (NAF) began slipping aseismically following the August 17, 1999 Izmit earthquake and continue for more than 13 years. To monitor this long-lasting afterslip, we use new SAR data, GPS and terrestrial LIDAR measurements along the fault. InSAR time series are calculated using 32 TerraSAR-X radar images acquired between 2011 and 2015 with the small baseline InSAR (SBAS) approach using the Supersites Istanbul archive provided by the German Aerospace Center, DLR (project HAZ2584_Marmara) (Hooper, 2008). The results show that the Izmit fault still creeps, but in an episodic manner. Two creep events are detected in the beginning and at end of 2013, each with an offset of ~20 mm between Izmit and Lake Sapanca. Campaign GPS measurements on a recently established network with 35 benchmarks and LIDAR measurements on three sites confirm the ongoing aseismic activity along the fault (TÜBİTAK project no: 113Y102).