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Shows that an aeromagnetic survey can distinguish the relatively small magnetisation contrasts found in sedimentary basins. Some of the magnetic lineations studied are the result of magnetic horizons being offset by faults and shear zones, but most appear to result from demagnetisation of sediments in the vicinity of fault zones. There are two examples of magnetic highs over fault zones suggesting that there may be some process generating magnetic minerals in these areas.
This volume provides comprehensive and authoritative coverage of all the main areas linked to geomagnetic field observation, from instrumentation to methodology, on ground or near-Earth. Efforts are also focused on a 21st century e-Science approach to open access to all geomagnetic data, but also to the data preservation, data discovery, data rescue, and capacity building. Finally, modeling magnetic fields with different internal origins, with their variation in space and time, is an attempt to draw together into one place the traditional work in producing models as IGRF or describing the magnetic anomalies.