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Electrical strike imaging and anisotropy diagnosis from surface resistivity measurements
Author(s) -
Senos Matias M.J.
Publication year - 2008
Publication title -
near surface geophysics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.639
H-Index - 39
eISSN - 1873-0604
pISSN - 1569-4445
DOI - 10.3997/1873-0604.2007031
Subject(s) - anisotropy , geology , electrical resistivity and conductivity , gemology , environmental geology , regional geology , outcrop , field (mathematics) , fracture (geology) , igneous petrology , economic geology , geophysics , engineering geology , hydrogeology , mineralogy , telmatology , seismology , geotechnical engineering , optics , geomorphology , physics , volcanism , mathematics , quantum mechanics , pure mathematics , tectonics
Field resistivity measurements are often affected by the inhomogeneity and anisotropy of subsurface formations. The crossed square array is an electrode array particularly suited to investigating these problems. Herein, its use to obtain concealed formations electrical strike pseudosections will be shown. Field and 2D data modelling will be discussed and images of computed strike in depth and space will be presented and interpreted. Data modelling was carried out by using theoretical solutions based on the application of image theory to simple 2D outcropping models. More complex 2D concealed model solutions were obtained by physical analogue modelling. Furthermore, it has also been difficult to distinguish ground inhomogeneity and lateral resistivity variations from anisotropy in field data. Hence, it will also be shown that with crossed square array data anisotropy analysis it is possible to distinguish fracture anisotropy and structural anisotropy from media that conform closely to real anisotropy situations.