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| | Abstract | | The authors conducted GPR survey to reveal the structure of an artificial hill in Kumamoto Suizenji Garden. The garden is a national historical site, and is one of the most famous tourist attractions in Kumamoto prefecture. There is a very beautiful hill like Mt. Fuji miniature model in the garden. When the 2016 Kumamoto earthquake with Mw7.0 occurred, the top of the hill subsided and some cracks appeared. Non-destructive investigation was required for making a plan to repair the hill. For this reason, we performed highly dense GPR survey using HS350(GSSI) antenna synchronized with RTK-GNSS to visualize internal structure of the hill. We calculated the emitted direction of radio waves when the surface of the hill changes, and applied the diffraction stacking method in a three-dimensional Cartesian grid using the data of survey lines arranged radially. As the results of the GPR imaging, some remarkable reflections appeared and it was considered to be the traces constructed in the past. We are going to reconstruct the three-dimensional surface model of the previous hill. Then we are going to interpret the construction history of the hill. |
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