Nature research paper: Weak upper-mantle base revealed by postseismic deformation of a deep earthquake
, but with a weak asthenosphere of 2.5-year Maxwell time. In each case, the displacements are close to the linear summation of the displacements resulting from modeling the weak asthenosphere and the weak base of MTZ separately. Horizontal displacements are in similar directions, and add constructively, resulting in 10 to 20 % larger displacements at the sites close to the earthquake.
On the other hand, due to the uplift in the west of the epicentre and west of the trench produced by the weak asthenosphere, opposite from those produced by weak base of MTZ , the vertical displacements tend to add destructively in stations in Fiji and Tonga islands . This decreases the overall fit to the observation by about 14 and 6 %.
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