Construction of 250m square mesh shallow subsurface model in Osaka and Kobe areas

In urban areas, excessive groundwater pumping has caused severe ground settlement in the past. As a result, the pumping of groundwater is now regulated, raising the level of groundwater and causing various problems such as the risk of liquefaction. Shallow subsurface model has been well utilized for the evaluation of geo-disasters such as earthquake motion and liquefaction potential. To date, it has been constructed nationwide by various methods. In this study, we constructed shallow subsurface model using Kansai Geo-informatics Database from the surface layer to the engineering basement for every 250m mesh in the Osaka and Kobe areas. We also modeled the grain size characteristics of the sand layer and the geotechnical properties of the clay layer. These results provide basic data for solving geotechnical problems.