Seismic signals produced while drilling a Hot Dry Rock (HDR) geothermal well in Soultz-sous-Foret (France) were detected using a 4-component seismic detector and two single-component detectors in the granite basement. The recorded signals had a signal-to-noise ratio of around 8 dB with respect to the background noise and show relatively high spectral whiteness. Results from three-dimensional hodogram analysis were successfully interpreted using a model in which the drill bit generates predominantly continuous shear waves. Reflected waves were detected using both the spatial and temporal cross-correlation of hodograms. The distribution of reflectivity from the tri-axial drill-bit vertical seismic profiling (TAD-VSP) suggests that the bottom of the artificial geothermal reservoir, created by hydraulic stimulation, has a high reflection coefficient. The pre-existing permeable zone inside the reservoir was also detected by the TAD-VSP, The reflection image of the TAD-VSP agrees well with that found by the AE (Acoustic Emission) reflection method. The TAD-VSP was successfully used to detect the internal structure of the deep basement.