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| | Abstract | | The deep subterranean development is planned in the city part, and the shield construction such as roads and common ducts is done in recent years. A geological survey by the drilling etc. is done to construct the structure beforehand, and the attempt to evaluate the two dimensional physical properties value of the underground by the geophysical exploration has been done since before too. The geophysical explorations using a refraction wave, a reflection wave, a surface wave and resistivity survey are applied generally, but there are the buildings and the roads on the ground, and the lifelines and the subways underground in the city area, it is very difficult to establish the survey line on the ground. Then, we developed the S wave generating system and the receiving system in the borehole to obtain S wave velocity tomography section using two boreholes. |
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