Yuliia Semenova

Project

In her research, Dr. Yuliia Semenova studies the nonlinear ground behavior under seismic loads. Key elements of the joint study with DGFI-TUM are (a) to develop an approach to identify, in time series of permanent GNSS observing stations, nonlinear effects that occur in ground during and after earthquakes and (b) to analyze and model the characteristics of the manifestation of these effects. DGFI-TUM is responsible for the realization of the International Terrestrial Reference System (ITRS) as one of three ITRS Combination Centers of the International Earth Rotation and Reference System Service (IERS) worldwide – along with JPL/NASA (USA) and IGN (France). The ITRS is the global coordinate system of highest accuracy and the basis for global positioning and navigation, e.g., when using GPS. Better understanding of nonlinear ground behavior under observation stations during and after earthquakes will improve the analysis, interpretation, and modeling of postseismic deformations at GNSS stations. This in turn will lead to significantly increased accuracies of station coordinates and their temporal changes and thus improve the accuracy and long-term stability of the ITRS realization.