Inversion of Nankai Trough High Resolution Two-Ship Profile

逆冲板块边缘构造在很大程度上取决于控制变形力学状态和变形方式的物理性质。孔隙度、渗透率、孔压和沉积物强度是影响变形响应的重要岩石性质。1987年，PI在日本附近的南卡日海槽收集了7个扩展展布剖面(ESP)和5个分裂展布剖面(SSP)。利用走时信息反演了ESP和SSP的纵波速度。PI现在建议实施两种全波形反演技术，并将这些技术应用于南开海槽的ESP和SSP数据。他们将同时应用剥层反演方法和迭代正演模拟方案来评估其性能。这些反演将导致对纵波速度、密度以及可能的横波速度的更详细的估计。然后，这些量将被用来在海沟底部附近的最大应变区建造两个沉积物物理性质的横断面。

Covergent plate margin tectonice depends critically on the physical properties which control the mechanical state and style of deformation. Porosity, permeability, pore pressure and sediment strength are important rock properties which influence the deformation response. In 1987 the PI's collected 7 expanding spread profiles (ESP's) and 5 split spread profiles (SSp's) across the Nankaj Trough off Japan. The ESP's and SSP'shave been inverted for compressional wave velocity using travel-time information. The PI's now propose to implement two full waveform inversion techniques and apply these to ESP and SSP data from the Nankai Trough. They will apply both a layer-stripping inversion method and an iterative forward modeling cheme to evaluate their performane. These inversions will result in a more detailed estimate of compressional wave velocity, density, and possibly shear wavy velocity. These quantities will then be used to construct two transects of sediment physical properties in the zone of maximum strain near the base of the trench.