Fig. 7
From: Weakening behavior of the shallow megasplay fault in the Nankai subduction zone
Friction along the megasplay fault. Seismic cross section of Site C0004 showing how friction slip and velocity dependence is expected to evolve with depth along the megasplay fault. At deeper depths, slip dependence is the mechanism facilitating instability at short displacements, but at larger shear displacement the friction velocity dependence becomes dominant. At shallow depths, the friction velocity dependence is dominant for both short and large shear displacement. Line thicknesses illustrate the relative magnitude of the velocity and slip dependence. Depth is extrapolated from effective normal stress calculations from shipboard bulk density measurements on the cored interval. The overview map is shown in Fig. 1. Inset indicates natural hazards associated with megasplay slip deforming the seafloor