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Interpretation of data from a 1989 multichannel seismic (MCS) survey of the central Oregon Margin indicates that pore fluids escaping from the accretionary prism follow paths that are largely fracture controlled and fault guided. MCS evidence of this control includes reversed-polarity, fault-plane reflections, P-wave-velocity reversals, and upward deflection of gas hydrate reflections where they cross fault traces on some seismic sections. Site 891 was located on the frontal thrust of the accretionary prism. At this site the thrust dips 8° landward and produces a high-amplitude, reversed-polarity reflection that suggests the thrust may be a conduit for fluids from the decollement. Site 892 is situated on an out-of-sequence thrust within the prism that is known to be hydrogeologically active. The thrust dips 14° landward. Upward deflection of the gas hydrate reflection is present where it crosses the fault trace. In Cascadia Basin, west of the Leg 146 Oregon drill sites, velocity measurements increase within all strata in a landward direction, suggesting that diffusive flow is the dominant dewatering process. In the area of the basin nearest the prism, where incipient deformation was observed, proto-thrusts may augment diffusive flow in the section above a proto-decollement. A velocity inversion in the sedimentary section occurs below the proto-decollement. The depth of the proto-decollement may be at the top of an overpressured sedimentary section below a layer with low permeability.

Consolidation and Deformation of Sediments at the Toe of the Central Oregon Accretionary Prism from Multichannel Seismic Data