Block-like plate movements in eastern Anatolia observed by InSAR

Abstract

The question whether continental plates deform internally or move as rigid blocks has been debated for several decades. To further address this question, we use large-scale interferometric synthetic aperture radar (InSAR) data sets to study how eastern Anatolia and its surrounding plates deform. We find that most of the deformation is focused at the North and East Anatolian faults and little intraplate deformation takes place. Anatolia is therefore moving, at least its eastern part, as a uniform block. We estimate the slip velocity and locking depth of the North Anatolian fault at this location to be 20 mm/yr and ~14 km, respectively. High deformation gradient found near the East Anatolian fault, on the other hand, suggests that little stress is accumulating along the eastern sections of that fault. Key Points Relative plate-motions in eastern Turkey are measured by InSAR Eastern Anatolia moves like a single block with little internal deformation Limited elastic stress is accumulating on the east Anatolian fault ©2013. American Geophysical Union. All Rights Reserved.