Abstract
P-wavefield complexities are easily seen in the NORESS array records despite the small aperture of 3 km. The siting area is well mapped geologically and is partly sampled by a 2.5 km seismic reflection profile. Using this information in combination with tomographic mapping (ACH) on the basis of NORESS P n-records, we have undertaken structural mapping of the site area down to ca. 3 km. The major result is that the area is relatively homogeneous (rhyolite/granite), except for the northeast quadrant which is dominated by an intrusive gabbro body. The gabbro intrusion appears to be roughly mushroom shaped thinning towards the centre of the array. Only the upper reflector on the profile (ca. 1.1 km) is accounted for by this model while deeper ones at ca. 1.7 and 2.5 km do not have a counterpart in the 3D results. The small array aperture excludes mapping of more deep seated structural anomalies.
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