Helicopter-borne magnetic, electromagnetic and radiometric geophysical survey in Kvæfjord area, Kvæfjord, Troms
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- Rapporter 
NGU conducted an airborne geophysical survey in Kvæfjord area in August 2012. This report describes and documents the acquisition, processing and visualization of recorded datasets. The geophysical survey results reported herein are 2190 line km.The Geotech Ltd. Hummingbird frequency domain system supplemented by optically pumped cesium magnetometer and 1024 channels RSX-5 spectrometer was used for data acquisition. The survey was flown with 200 m line spacing, line direction of 60\u00B0 NE-SW with the average speed 89 km\/h. The average terrain clearance of the bird was 51 m.Collected data were processed in NGU using Geosoft Oasis Montaj software. Raw total magnetic field data were corrected for diurnal variation and levelled using standard micro levelling algorithm. EM data were filtered and levelled using both automated and manual levelling procedure. Apparent resistivity was calculated from in-phase and quadrature data for each of the five frequencies separately using a homogeneous half space model. Apparent resistivity dataset was levelled and filtered. Radiometric data were processed using standard procedures recommended by International AtomicEnergy Association.All data were gridded with the cell size of 50 m and presented as a maps at the scale of 1:50 000.