Røst Basin Aeromagnetic Survey (RAS-03). ra 3 aeromagnetic compilation. Data acquisition and processing report

Abstract

A high sensitivity aeromagnetic survey (RAS-03) was carried out in an area of c. 41400 km2 over the Røst Basin offshore Lofoten, Northern Norway. Data processing comprised spike removal and data editing, IGRF correction, loop closure levelling and floating differential median micro-levelling. Four maps were produced for the survey area. One of these shows magnetic total field anomalies after correction for the IGRF of 2000. Two maps show residual magnetic values after application of two different high pass filters. A map showing magnetic analytic signal is also presented. The residual maps after high pass filtering delineate anomalies with amplitudes as low as 0.1-0.2 nT, representing shallow and weak magnetic sources in sedimentary basins.