• Proceedings of the Korean Geotechical Society Conference
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• 1997.10a
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• pp.253-260
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• 1997

• Geophysics and Geophysical Exploration
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• v.2 no.3
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• pp.137-141
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• 1999

In order to estimate the anisotropy of the medium, we deployed a series of 120-sources in a borehole, and simultaneously recorded 3-component seismic data at 5 locations on the surface. We have tried to estimate the directional velocities by comparing the first arrivals at different receivers. For that purpose, the receiver statics must be corrected prior to pick the first arrivals. However, in an IVSP with a limited number of receiver points, it may not possible to estimate a reliable receiver statics, therefore, instead of using individual first arrival times, we tried to estimate the move-out velocity at each records. From this analysis, we have found that there exists a measurable amount of difference in directional velocities, and confirmed that the velocity anisotropy agrees with the results of the previous studies conducted in this area.