Based on the behavior of the asthenosphere, the rifting is driven by passive and active rifting components (Sengör and Burke, 1978; Figure 1.2), which are understood as rather end-members of the natural rift types driven by the mixture of these components (see, e.g., Huismans, 1999; Davis and Kusznir, 2002; Manatschal, 2004; Huismans and Beaumont, 2005; Simon and Podladchikov, 2006).