The HydroGeophysics Group has performed a large SkyTEM survey on Mayotte; a volcanic island between the African mainland and Madagascar. The survey was a part of an extensive investigation carried out by a close collaboration between the French Geological Survey, BRGM, the Mayotte Prefecture and the Aarhus University.
The purpose of the survey was to:
The SkyTEM system used in the survey had a transmitter moment of about 100 000 Am2. With this moment the maximum depth of investigation is up to 250m, while different geological layers are mapped right from the surface. The average line separation was 200m but some areas were flown with just a 100m separation. Data were processed while they were flown and the results were then used to optimize the location of the subsequent lines.
3D image of the island
The field work finished mid-November 2010 and afterwards geophysicists from the HydroGeophysics Group processed and inverted the data to produce a 3D image of the entire island.