| Abstract: | This paper discusses the fault parameters of the Mikawa earthquake of January 12, 1945 on the basis of a simple dislocation model. Basically, the model assumes a rectangular shape of the fault plane striking N-S, so that it may fit the observed surface fault trace. Several sets of the fault parameters are tested to interpret the vertical and horizontal ground movements as observed geodetically. The fault model which is finally accepted is as follows: total length: 12 km; width: 11 km; dip angle: 30°; reverse dip-slip: 2 m; right-lateral strike-slip: 1 m. Geometry and slip in the present model seem to harmonize with the other sorts of evidence such as the seismological, tsunami genetic and reconnaissance data. From the tectonic point of view, this earthquake may be attributed to the secondary fault activity associated with the right lateral movement of the Median Tectonic Line. |
