Abstract Electrical resistivity tomography (ERT) and ground magnetic surveys were applied to characterize an old uncontrolled landfill in a former exploited sand gravel quarry area the north-west of city Cologne, Germany. The total field its vertical gradient recorded using proton precession magnetometer cover about 43,250 m 2 . data transferred frequency domain then reduced north pole. amplitu...

electrode arrays allows for the interpretation of the twodimensional distribution of electrical conductivity in the The analytic element method is used to investigate the spatial subsurface. The electrical conductivity distribution can sensitivity of different electrical resistivity tomography (ERT) arrays. By defining the sensitivity of an array to a subsurface location we then be related to t...

Abstract This study was carried out with a view to establishing routine for the selection of optimum electrode spacing accurate measurement resistivity within unusually thin (5–100 cm) subsurface layer in agro geophysics. The Hummel’s image theory 2-Layer Wenner Vertical Electrical Sounding (VES) formed theoretical basis study. For purpose simulation, computer program developed using theory. si...

Barbara R. Stucki is a research analyst In the Public Policy Institute at the American Association of Retired Persons. She deals with policy issues concerning long-term care needs ofolderpersons, with special smphssis on minority elders, persons with disabilities, and the family support network. Information for this paper was collected as part of dissertation research conducted in 1990-1991, fu...