Abstract
Highly deformed unconsolidated hemipelagic sediments were found below the sea bed surface at anomalously shallow depths near the junction between the Mariana and Yap arc-trench systems. The order of deformation is (1) sigmoidal veins and spaced foliations, (2) layer-parallel shear planes, (3) reverse faults and kink bands and (4) more veins. All the deformation structures are considered to have been developed progressively during shear parallel to bedding, accompanied by volume decrease due to pore reduction and fluid expulsion during consolidation, while the sediments are not yet lithified.
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