Alexandru Tiganescu
a) National Institute for Earth Physics, P.O. Box MG-2,Magurele 077125, Romania. b) Technical University of Civil Engineering, Lacul Tei Avenue 122–124, Bucharest 020396,
Romania

Bogdan Grecu
National Institute for Earth Physics, P.O. Box MG-2,Magurele 077125,
Romania

Iolanda Gabriela Craifaleanu
b) Technical University of Civil Engineering, Lacul Tei Avenue 122–124, Bucharest 020396, Romania. c) National Institute for Research and Development in Construction, Urban Planning and Sustainable Spatial Development “URBAN INCERC”, Pantelimon Str. 266, Bucharest 021652,
Romania