“…The response spectrum method was introduced by Biot in 1932 (see of instance the article by Trifunac, 2006) in the context of earthquake engineering and has intensively been studied to extend its domain of applicability to many different situations and applications in the domain of structural engineering, mechanical engineering, earthquake engineering, civil engineering, nuclear engineering, and offshore engineering, as it can be shown in the articles by Levy and Wilkinson (1976), Gupta and Chu (1977), Peters et al (1977), Kost et al (1978), Sato et al (1978), Anderson and Trifunac (1979), Hadjian (1981), Unruh and Kana (1981), Scherer et al (1982), Nouromid et al (1983), Preumont (1984), Gupta and Jaw (1986a,b,c), Sharma and Singh (1986), Chan (1987), Khan (1987), Yang et al (1990), Beck and Papadimitriou (1993), Chen (1993), Der Kiureghian and Nakaruma (1993), Smith and Hollowell (1996), Gupta and Joshi (1998), Allam and Datta (2000), Lam et al (2001), Li and Li (2005), Su et al (2006), and Jankowski (2006).…”