The Vihanti HIRE seismic reflection profiles were acquired in 2007.
The split–spread geometry had 402 active channels with a geophone
group spacing of 12.5 m. Four profiles were acquired using explosive
sources due to limited vehicle accessibility in swampy areas. For the
remaining seismic lines, source signal was produced with three Vibroseis
trucks. At each shot point six recordings were stacked to enhance the
signal-to-noise ratio of the seismic field data. The average CMP fold is approximately
80 traces. Data acquisition parameters are listed in Table 1.
In this processing study for the Vihanti survey, seismic profile V3
(Fig. 1) was chosen for closer examination. V3 is expected to show
the potential continuation of the Lampinsaari association hosted mineralizations
because the profile crosses the buried Vilminko Formation.
Profile V3 is long and perpendicular to the strike of the structures, making
it the key profile most likely to provide useful and unambiguous information
about the geology of the volcanic unit hosting the massive
sulfides.