Summary
During October and November, 1996, an airborne geophysical reconnaissance survey was carried out over the southwest corner of Eritrea. The NORAD-funded project was a collaboration between the Geological Survey of Norway and the Eritrean Geological Survey. Ten-thousand line-kilometers of radiometric, magnetometric, and electromagnetic data were acquired using a fixed-wing air- craft from the Geological Survey of Finland and operated by their personell. The line spacing over the 14 600 square km survey area was 2 km although about 25 percent of the survey area had infill lines, reducing the spacing in this area to 1 km. Nominal flying height was 60 m, but in areas of extreme topographic relief flight heights were generally higher and more variable. The data were processed by the Geological Survey of Norway using processing software Developed by Gepsoft,Inc. Magnetic data, consisting of total field measurements collected by a cesium vapour magnetometer, were leveled by removing diurnal variations as recorded at a magnetic base station at an air- port 8 km west of Teseney, Eritrea.
