Appraisal of the parameters of the Lithoprobe Abitibi-Grenville seismic reflection survey

The 1990-1991 Lithoprobe Abitibi-Grenville seismic reflection survey comprises 989 km of regional data collected for crustal exploration and 81 km of high-resolution data collected for mineral exploration. A proper interpretation of the data requires an understanding of its limitations, these are a function of the acquisition parameters. The vertical resolution is ~38 m for the regional data and 15 m for the high-resolution data. The maximum reflector dip that can be imaged in shallow datais ~70°, but deep data are biased toward subhorizontal reflections. The principal sources of noise are vibrator truck noise, ground roll, and shear wave refractions. Power-line noise is surprisingly important on some high-resolution lines. The seismic signal penetrates to the Moho, revealing differences in Moho reflectivity across the survey. -Authors