Abstract
In order to discuss how we can obtain a more accurate two-dimensional distribution of seismic velocity in a rock mass, field measurements for tomographic analysis were performed. The accuracy of reconstructed image is greatly controlled by the accuracy of data. Therefore, at first, in order to accomplish more accurate travel time data, travel time data which were read out initially was corrected by using several checking methods. Then, in order to achieve an accurate analysis, an optimum inversion technique and optimum required parameters are selected. The velocity distribution which is obtained as the result of tomography analysis shows good agreement with both the result of laboratory measurements and that of geological observations. The applicability of seismic velocity tomography for exploration of ore deposits and for evaluation of in-situ rock mass is discussed.
