However, the result using this technique is very erratic and unpredictable.
In 1912, using very basic equipment Conrad Schlumberger recorded the first equipotential curves at his estate near Caen in Normandy and at the iron mines in the area.
In 1912, using very basic equipment Conrad Schlumberger recorded the first equipotential curves at his estate near Caen in Normandy and at the iron mines in the area.
The results show the method able to detect metal ores and also revealed features of the subsurface structure, such as bed boundaries and the direction of formation layer dips.
In 1915, Frank Wenner based on the work of Schlumberger suggested that a linear array of four equally spaced electrodes would minimize soil – electrode contact problems if potential – measuring and current – induced electrodes are separated in space.
In 1915, Frank Wenner based on the work of Schlumberger suggested that a linear array of four equally spaced electrodes would minimize soil – electrode contact problems if potential – measuring and current – induced electrodes are separated in space.
Since then, all the electrical resistivity methods applied in geophysics and soil science are based on the standard four – electrode principle.
Over the past few decades, the resistivity imaging technique was advancing from one dimensional (1D) to four dimensional (4D) which is time-lapse survey.
Over the past few decades, the resistivity imaging technique was advancing from one dimensional (1D) to four dimensional (4D) which is time-lapse survey.
The rapid development of computers also giving major impact for the practical application of advanced inversion methods for imaging purposes.
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| Source: the University of Houston |
