Institution: | Department of Theoretical Physics (Geophysics), University of Zaragoza, Plaza de San Francisco, 50009 Zaragoza, Spain;Central Geophysical Observatory, National Geographical Institute, 45071 Toledo, Spain;Higher Politechnic Centre, University of Zaragoza, María de Luna, 3, 50015 Zaragoza, Spain;Civil Engineering School, Politechnic University of Catalunya, 08034 Barcelona, Spain |