Mostafa Farrag, GFZ German Research Centre for Geosciences, Potsdam, brandenburg, Germany, Nguyen Dung, GFZ Potsdam, Potsdam, Germany, Bruno Merz, GFZ German Research Centre for Geosciences, Potsdam, Germany and Sergiy Vorogushyn, Helmholtz Centre Potsdam GFZ German Research Centre for Geosciences, Potsdam, Germany