The compressive state of stress in the accretionary prism requires correction of effective stress values inferred directly from consolidation tests. Good correlation between LWD and core sample physical properties indicates the latter are reliable and argues for minimal rebound from in situ conditions. Estimated fluid pressures are near lithostatic in the d collement zone and proto-d collement zone. Thrust faults tend to occur in intervals of high fluid pressure.
Fluid pressures tend to be highest in clay-rich zones.
This last correlation could be a result of misrecognition of bound water as porosity, but use of the same techniques to calibrate the consolidation tests as well as to determine the porosity of the samples accounts for this ambiguity. Concentration of deformation in the clay-rich zones may be because of their low coefficient of friction in addition to their high fluid pressure.