a Site 1174 b Site 1174 C Site 808 d ite 808
 600 600 700 700 I
 + ++ +

 700- 700 800- + 800-
 4 0
 800- E 8-E E
 a 09900

 100 900 1000 o1000


 91100 *1200 + 1200

 2 0.3 0.4 0.5 0 0.2 0.4 0.6 0.2 0.3 0.4 0.5 0 0.2 0.4 0.6
 Porosity ,* Porosity
 + Observed Porosities -- log(ko)=-20.82
 -- Base Run (log(ko) =-19.82) x--log (ko) =-20.15
 -- Turbidite log(ko) =-16.82 X* based on Saffer (2003)
 -- k-n relationship from
 Saffer and Bekins (1998)

Figure 3-6. Simulated porosity and k* profiles with varying bulk permeability at Sites
 1174 and 808. A & C) Comparison of observed porosity to simulated porosity
 at Sites 1174 and 808. B & D) Simulated '* profiles at Sites 1174 and 808.
 Shading represents the decollement zone. The. values estimated by Saffer
 (2003) were based on LWD (Site 1174) and Shipboard data (Site 808).
 Vertical lines represents estimate by Screaton et al. (2002).

 When the bulk permeability of both turbidites and hemipelagics was lowered by an

order of magnitude (from log (ko) =-19.82 to -20.82) the pore pressures below the

decollement significantly increased compared to the base run (Table 3-4, Figure 3-6).

The simulated k* values reached above 0.45 at both Sites 808 and 1174 and the simulated

porosities above and below the decollement were overestimated compared to the

observed porosity values (Figures 3-6). As bulk permeability was lowered, the steepness

of the slope of the profile gradually increased (Figure 3-6).

 The profile for log (ko) = -20.15 represents the relationship shown in Figure 3-4

for the lower range of permeability values. The profile of this simulation shows higher

values for k* compared to the results obtained for the base run. The estimated porosities