We have developed the systems of reconstructing the 3D computational models of tectonic structure called CHIKAKU DB/CAD as a part of projects for developing simulation software, for the purpose of the clarification of the mechanism of earthquakes, and the prediction of the earthquake wave propagation. The main purpose of the development of CHIKAKU DB/CAD is to manage measured data such as earthquake center points, to edit the upper plate surface from such data, and to offer the data for the numerical simulations of tectonic activity. Today, it is quite difficult to measure the tectonic structure directly. Here we also discuss the method for creating 3D tectonic models of in and around Japanese Islands from given measurement data.

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