Monika Margarete Sobiesiak, Institute of Geophysics Polish Academy of Sciences, Warsaw, Poland, Natalia Poiata, Institut de Physique du Globe, Paris, France, Pascal Bernard, Institut de Physique du Globe de Paris, Paris, France, Lukasz Rudzinski, Institute of Geophysics, Polish Academy of Sciences, Department of Seismology, Warsaw, Poland, Stanislaw Lasocki, Institute of Geophysics PAS, Warsaw, Poland and Pascal Bernard, Lukas Rudzinski, Stanislaw Lasocki