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The magnetic gradient tensor (MGT) provides gradient components of potential fields with mathematical properties which allow processing techniques e.g. analytic signal techniques. With MGT emerging as a new tool for geophysical exploration, the mathematical modelling of gradient tensor fields is...
Correction concepts for the elimination of environmental influences on gamma-ray logs have been published in a number of articles and in guidelines by service companies. However, these widely-used processing rules for open- and cased-hole measurement conditions have been presented in different...
GPR (Ground Penetrating Radar) results are shown for perpendicular broadside and parallel broadside antenna orientations. Performance in detection and localization of concrete tubes and steel tanks is compared as a function of acquisition configuration. The comparison is done using 100 MHz and...
An example of magnetotelluric data is discussed which has distinctive phase values out of quadrant, and for which the Z xx element of the measured tensor is greater than the Z xy element in both real and quadrature parts. Mohr circle plots and principal value decompositions of the real and...
2D resistivity methods can provide useful information about moisture distributions within porous historic stonework, especially when used in conjunction with simulated driving rain. Moisture is known to be a highly important factor in the deterioration of porous stone. We report here on a series...
The study on topsoil contamination due to heavy metals was carried out by using the Magnetic susceptibility (MS) measurements in Izmit industrial city, northern Turkey. We attempted to investigate correlations between the concentration of selected heavy metals and the MS from 41 sample sites...
Seismic P waveforms from a hardrock crosswell experiment were inverted for the velocity distribution between boreholes. The inversion was carried out by an iterative source estimation scheme in the frequency domain. Six frequencies in the range 900–2000 Hz were employed to yield a tomogram...
Owing to their nature landfills are challenging targets for high resolution Near Surface Geophysics. Herein it is described an integrated high resolution geophysical survey over the Ilhavo landfill sealed about a decade ago. The first aim of the survey is to investigate the time evolution of the...
The magnitudes of the initial amplitude of the magnetic resonance sounding (MRS) signals from an aquifer located in a layered electrically conductive earth, are nonlinear functions of water content distribution. Occam's inversion method is adapted to the nonlinear inversion problem. In the case...
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