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NUMERICAL DEFORMATION MODELLING USING GNSS DATA ON EXTENSIONAL ZONE
Abstract
Numerical models which are used for determining deformation are created as a simplified form of physical reality and they are usually defined as force or timedependent. The deformation is investigated by static, kinematic and dynamic models. From these models, dynamic deformation model describes the relationship between the forces and the changes of forces depending on time and the external factors which cause deformation. The deformation in an area is determined by evaluating together the theoretical dynamic model and GNSS observations of the area. Displacements are defined from the first measurement time to the last one in the same area by repeated GNSS observations at regular intervals. Therefore, the deformation of an area can be described using these displacements. Describing deformation is very important for understanding the behaviors of time-dependent tectonic movements and estimating risks of earthquake. In this study, in order to investigate the deformation caused by the influence of force depending on time, an extension zone is given as an example. A half-graben model is represented for showing deformation changes depending on time, rheology of an area, force size and direction. Based on the half-graben model example, a graben from Western Anatolia which is the most important extensional zone of the world is studied and the coherence between the displacement obtained from GNSS data and theoretical deformation model is mentioned.
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References10
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