### Abstract

Investigation depth of various DC geoelectric arrays has always been in the focus of interest of geoelectricians. According to its classical definition (Roy and Apparao 1971), the depth of investigation is the depth of the maximum response due to a horizontal thin-sheet embedded in a half-space, by using a given geoelectric array. On basis of the graph of the thin-sheet response as a function of the depth (from the so-called "depth of investigation characteristics" or DIC function) Edwards (1977) found more realistic to compute the medium depth than the depth of the maximum response. DIC functions have been known so far only for simple colinear arrays, the dipole equatorial array and two focused arrays. Here we provide a summary about the depth of investigation values of various dipole-dipole arrays (for parallel, perpendicular, radial, azimuthal ones), and for the most important noncolinear and focused arrays. Depth of investigation values are computed from both approaches. DIC functions (obtained by a new analytical formula) are also presented, as illustrations. The analytical formula can be used to compute DIC function of any surface geoelectric array. A systematic interpretation of the resulting depth of investigation values provides simple but useful thumb-rules for practical applications.

Original language | English |
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Title of host publication | Near Surface 2007 - 13th European Meeting of Environmental and Engineering Geophysics |

Publisher | European Association of Geoscientists and Engineers, EAGE |

Publication status | Published - 2007 |

Event | 13th European Meeting of Environmental and Engineering Geophysics of the Near Surface Geoscience Division of EAGE, Near Surface 2007 - Istanbul, Turkey Duration: Sep 3 2007 → Sep 5 2007 |

### Other

Other | 13th European Meeting of Environmental and Engineering Geophysics of the Near Surface Geoscience Division of EAGE, Near Surface 2007 |
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Country | Turkey |

City | Istanbul |

Period | 9/3/07 → 9/5/07 |

### Fingerprint

### ASJC Scopus subject areas

- Geochemistry and Petrology
- Geotechnical Engineering and Engineering Geology
- Energy Engineering and Power Technology

### Cite this

*Near Surface 2007 - 13th European Meeting of Environmental and Engineering Geophysics*European Association of Geoscientists and Engineers, EAGE.

**Depth of investigation of dipole-dipole, noncolinear and focused geoelectric arrays.** / Szalai, S.; Novák, A.; Szarka, L.

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

*Near Surface 2007 - 13th European Meeting of Environmental and Engineering Geophysics.*European Association of Geoscientists and Engineers, EAGE, 13th European Meeting of Environmental and Engineering Geophysics of the Near Surface Geoscience Division of EAGE, Near Surface 2007, Istanbul, Turkey, 9/3/07.

}

TY - GEN

T1 - Depth of investigation of dipole-dipole, noncolinear and focused geoelectric arrays

AU - Szalai, S.

AU - Novák, A.

AU - Szarka, L.

PY - 2007

Y1 - 2007

N2 - Investigation depth of various DC geoelectric arrays has always been in the focus of interest of geoelectricians. According to its classical definition (Roy and Apparao 1971), the depth of investigation is the depth of the maximum response due to a horizontal thin-sheet embedded in a half-space, by using a given geoelectric array. On basis of the graph of the thin-sheet response as a function of the depth (from the so-called "depth of investigation characteristics" or DIC function) Edwards (1977) found more realistic to compute the medium depth than the depth of the maximum response. DIC functions have been known so far only for simple colinear arrays, the dipole equatorial array and two focused arrays. Here we provide a summary about the depth of investigation values of various dipole-dipole arrays (for parallel, perpendicular, radial, azimuthal ones), and for the most important noncolinear and focused arrays. Depth of investigation values are computed from both approaches. DIC functions (obtained by a new analytical formula) are also presented, as illustrations. The analytical formula can be used to compute DIC function of any surface geoelectric array. A systematic interpretation of the resulting depth of investigation values provides simple but useful thumb-rules for practical applications.

AB - Investigation depth of various DC geoelectric arrays has always been in the focus of interest of geoelectricians. According to its classical definition (Roy and Apparao 1971), the depth of investigation is the depth of the maximum response due to a horizontal thin-sheet embedded in a half-space, by using a given geoelectric array. On basis of the graph of the thin-sheet response as a function of the depth (from the so-called "depth of investigation characteristics" or DIC function) Edwards (1977) found more realistic to compute the medium depth than the depth of the maximum response. DIC functions have been known so far only for simple colinear arrays, the dipole equatorial array and two focused arrays. Here we provide a summary about the depth of investigation values of various dipole-dipole arrays (for parallel, perpendicular, radial, azimuthal ones), and for the most important noncolinear and focused arrays. Depth of investigation values are computed from both approaches. DIC functions (obtained by a new analytical formula) are also presented, as illustrations. The analytical formula can be used to compute DIC function of any surface geoelectric array. A systematic interpretation of the resulting depth of investigation values provides simple but useful thumb-rules for practical applications.

UR - http://www.scopus.com/inward/record.url?scp=84896268266&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84896268266&partnerID=8YFLogxK

M3 - Conference contribution

AN - SCOPUS:84896268266

BT - Near Surface 2007 - 13th European Meeting of Environmental and Engineering Geophysics

PB - European Association of Geoscientists and Engineers, EAGE

ER -