2D-3C high-resolution seismic data from the Abitibi Greenstone Belt, Canada

One high-resolution seismic profile acquired as part of a 3-component (three orthogonal seismometers) regional seismic reflection survey within the southern Abitibi greenstone belt was investigated in more detail using tomography and by processing all three components. Several high-resolution lines had targeted the Porcupine–Destor deformation zone, a zone proximal to the large gold deposits of the Timmins mining camp, and revealed by the new seismic data to be a composite of early fold structures and late transpressive fault arrays that host quartz-vein gold. Processing of the horizontal-component data assumed that seismic waves were converted from P-waves to S-waves between Vibrator source and receivers; S-wave static corrections proved especially important. Radial-component sections showed most features observed previously on vertical-component sections, but some amplitudes became enhanced, others reduced. The transverse-component stack demonstrated that a few structures are 3-D or contain significant seismic anisotropy. Two dimensional, P- and S-wave travel-time tomography analysis using data from the 10-km-long linear receiver array revealed low-resolution (> 200 m) physical property variations, possibly related to mineralization in near-surface structures of the Porcupine–Destor deformation zone; these variations were especially apparent using Poisson's ratio.