抄録
In the crosshole seismic tomography, sources and receivers are placed in two parallel boreholes. For this source-receiver geometry, it has been clarified in the previous paper that the layer perpendicular to the holes can be detected quite well, but one parallel to the holes is hardly reconstructed. In this study, both the detectability of inclined layers and the relation between inclined angle of the layer and observation pattern were investigated, and an effective method to detect inclined layers was proposed. The coordinates of tomographic analysis were rotated so as to coinside with the angle of inclined layers, and the accuracy of reconstructed image was discussed. It was clarified that the detectable angle of inclined layers was closely connected with the angle of seismic rays.
