Restoration of the depression structure at the eastern part of central Kyushu, Japan by means of dislocation modeling

We have attempted to restore a subsurface structure in the eastern part of central Kyushu, Japan, by combining fault motions which were modeled as dis location planes embedded in an elastic isotropic half space. The simulated crustal deformation pattern was compared with the subsurface structures est imated from gravity anomalies and/or seismic prospecting. The modeling proc edure successfully restored all tectonic basins in the area without any nee d for motive forces for uplift or subsidence. The results also suggest that two major tectonic events have occurred in this region. Those are (1) the formation of half-graben caused by north-south extension, and (2) the forma tion of the pull-apart basin caused by east-west compression. (C) 1999 Else vier Science B.V. All rights reserved.