1. Institute of Physics, Centre for Science and Education , Silesian University of Technology , Gliwice , Poland
2. Department of Geophysics, Faculty of Oceanography and Geography , University of Gdansk , Gdańska , Poland
3. Institute of Earth and Environmental Sciences , Maria Curie-Skłodowska University , Lublin , Poland
4. Institute of Geography and Regional Development , University of Wrocław , Wrocław , Poland
5. Polish Geological Institute–National Research Institute, Marine Geology Branch , Gdańsk , Poland