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| | Abstract | | The 3D geophysical techniques are now widely applied in various underground surveys. However, the movement toward engineering purpose 3D refraction seismic survey is relatively inactive. For instance, it is usual even for obvious 3D structures to apply the 2D refraction seismic survey along mutually crossing multiple lines. Such way is, of course, accompanied by some essential problems. Especially, the resulting mis-tie of analyzed velocity profiles at the intersection point gives unpleasant result to the side of engineering design: the client of survey. In order to overcome such problems, we extend our "HD (High-Definition) tomography" to "3D-HD tomography" and study it by using both real and simulated data recorded for inclined structures. As a result, we observe that the 3D-HD tomography retrieves the 3D velocity distribution accurately while nicely solving the mis-tie problem. |
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