2019 Volume 19 Issue 6 Pages 6_76-6_90
The surface faults appeared and the permanent displacements were observed during the mainshock of the 2016 Kumamoto earthquake. In order to reproduce or predict the permanent displacements very close to the fault trace, it is necessary to consider the shallower rupture area than the seismogenic layer which is not taken into account in the strong motion prediction procedure, called Recipe, by the Headquarters for Earthquake Research Promotion, Japan. In this paper, we aimed to construct the fault rupture models for the 2016 Kumamoto earthquake to reproduce the observed strong motions and the permanent displacements in the region very close to the fault trace while taking advantage of the Recipe. As a result, it was shown that the strong-motion pulses and the permanent displacements of the observation records at Nishihara station, 700 m from the fault trace, and Mashiki station (KMMH16 by KiK-net), 2 km from the fault trace, can be reproduced well by adding a shallow fault model having a large slip region to the deep fault model made by the existing procedure of evaluating the parameters for predicting strong motions.
