where ˇ is a coefficient depending on the stress regime (0.75 for
tension and 3 for compression), is the density, g is the acceleration
due to the gravity (9.8 m s−2), is the pore fluid factor defined as
the ratio of pore fluid pressure to lithostatic pressure (Sibson, 1974),
and z the depth. The density of the brittle crust, adequate for rocks in
the upper crust, is taken as 2670 kg m−3 for the SCS and 2780 kg m−3
for the TB (Gómez-Ortiz et al., 2005b). In addition, a sedimentary
layer is considered in the TB (Table 1). We use the same hydrostatic
pore fluid factor ( = 0.37) for the whole lithosphere.