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Initiation of décollement zone in incoming sediments is crucial important to understand the mechanism of plate boundary faulting in subduction zones and consequently it may help to clarify the nature of seismogenic zone. However, the basic mechanism and dynamics during the initiation and the evolution of the plate boundary décollement zone remain poorly understood. It is therefore assumed that cyclic loading both in isotropic and deviatory stress due to stress wave propagation, especially P-wave during an earthquake, might cause a dramatic change in fabric and physical properties of sediments. In this paper, semi-lithified trench-slope siltstone from the Boso Peninsula and Fujinomori clay are tested with static and dynamic load under high confining pressure. Meanwhile, anisotropy of magnetic susceptibility (AMS) is also measured to check the changes in the internal textures of the specimen after these tests. As the results, no major fabric variation was confirmed based on AMS, in spite of substantial residual deformation occurred due to cyclic loading. These results are exactly the same as the mechanical properties of décollement zone in which the internal texture remained unchanged but the density increased significantly.

jiban kougaku janaru

Research on formation mechanism of plate boundary fault by investigating the macro-micro characteristics of semi-lithified trench-slope siltstone from the Boso Peninsula and Fujinomori clay subjected to dynamic load under high confining pressure