Fig. 4
From: Estimate of the contraction rate of central Japan through the deformation of the Philippine Sea slab
Schematic illustration of the measurement of the slab contraction amount. a Configuration of the slab prior to subduction, which should be flat. b Configuration of the slab after subduction. Slab deformation proceeds during subduction. The contraction amount of the slab is calculated by L(x) − x, where x is the horizontal distance measured from the origin and L(x) is the length of the thick solid curve, which represents the slab configuration