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- W2005129096 abstract "Migrated single‐channel seismic lines and Sea‐MARC II side scan and bathymetry data document an active accretionary prism along the obliquely convergent margin of south Panama, a region previously believed to be a transform margin. The eastern flank of the Coiba Ridge is being subducted in this region, creating the requisite geometry for along‐strike variation in trench sediment thickness and type. The regional east dip of the downgoing plate causes the depth of the oceanic crust along the trench to drop approximately 1800 m from west to east. In the western region of the study area the incoming sedimentary section consists of approximately 600 m of pelagic and hemipelagic sediments. A wedge of trench turbidites that overlies the incoming hemipelagic sediments thickens from less than 100 m in the western region to more than 900 m in the eastern region of the study area. The eastward increase in sediment thickness correlates with the following changes in the accretionary prism: (1) decrease in initial surface slope; (2) broadening of the inner trench slope; (3) increase in thrust spacing; (4) steepening of frontal thrusts; and (5) fold development. Each of the responses reflects, in varying degrees, the increase in volume and changing physical properties of the accreted material, as well as the changing shear strength of the décollement. The increase in overburden pressure and compaction in the deeper sediments, together with the change in lithology from oceanic to trenchfill sediments, should produce an eastward increase in sediment shear strength both within the wedge and along its base. Because the décollement will tend to form where the pore fluid pressure‐overburden ratio is at a maximum, the shear strength within the wedge should increase relative to basal shear strength. Decreased surface slopes will result from the increasing contrast in shear strength between the wedge and its base." @default.
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- W2005129096 date "1990-08-01" @default.
- W2005129096 modified "2023-10-14" @default.
- W2005129096 title "Variation in deformation of the South Panama Accretionary Prism: Response to oblique subduction and trench sediment variation" @default.
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- W2005129096 doi "https://doi.org/10.1029/tc009i004p00683" @default.
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