The behaviour of mise-à-la-masse anomalies near a vertical contact

Eloranta, E.

doi:10.1016/0016-7142(86)90014-1

Cited by 16 publications

(4 citation statements)

References 17 publications

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“…The details of quantitative interpretation can be obtained in Mwenifumbo (1980), Eloranta (1985Eloranta ( , 1986 and Wang et al (1991). The details of quantitative interpretation can be obtained in Mwenifumbo (1980), Eloranta (1985Eloranta ( , 1986 and Wang et al (1991).…”

Section: Discussionmentioning

confidence: 99%

The mise-a-la-masse method

2015

Groundwater Geophysics in Hard Rock

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Section: Discussionmentioning

confidence: 99%

The mise-a-la-masse method

2015

Groundwater Geophysics in Hard Rock

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“…It is recalled that the illustrations of Eloranta (1986) show the expected change in potential gradient associated with a conductor offset from a vertical fault. It is recalled that the illustrations of Eloranta (1986) show the expected change in potential gradient associated with a conductor offset from a vertical fault.…”

Section: Discussionmentioning

confidence: 99%

“…Concerning this last demonstration, the symmetry of the potential distribution may 400 P. Furness at first appear surprising in view of the resistivity variation in the environment. It is recalled that the illustrations of Eloranta (1986) show the expected change in potential gradient associated with a conductor offset from a vertical fault. However, when the body lies on the fault, as in Fig.…”

Section: Discussionmentioning

confidence: 99%

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Mise‐à‐la‐masse interpretation using a perfect conductor in a piecewise uniform earth

Furness

1999

Geophysical Prospecting

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A useful analysis of the mise‐à‐la‐masse problem can be made by considering a perfectly conducting orebody in a piecewise uniform conducting earth. While the use of a perfect conductor is clearly an idealization of the true geological conditions it provides several advantages for the present purpose. The electric field associated with the above model can be expressed in terms of a surface integral of the normal potential gradient over the boundary of the conductor, where the normal gradient satisfies a well‐posed Fredholm integral equation of the first kind. This integral equation formulation remains unchanged when the conductor is arbitrarily located in the conducting earth, including the important case when it crosses surfaces of conductivity discontinuity. Moreover, it is readily specialized to the important case of a thin, perfectly conductive lamina. Consideration of the boundary value problem relevant to a conductive body fed by a stationary current source suggests that under certain circumstances, equivalent mise‐à‐la‐masse responses will result from any perfect conductor confined by the equipotential surfaces of the original problem. This type of equivalence can only be reduced by extending the potential measurements into or on to the conductor itself. This ambiguity in the interpretation of mise‐à‐la‐masse surveys suggests a simple if approximate integral solution to the mise‐à‐la‐masse problem. The solution is suitable for modelling the responses of perfect conductors and could possibly be used as the basis of a direct inversion scheme for mise‐à‐la‐masse data.

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Geoelektrik

Berktold¹,

Büttgenbach²,

Greinwald³

et al.

Geophysik

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Die unter dem Begriff Geoelektrik zusammengefaßten elektrischen und elektromagnetischen Verfahren werden eingesetzt zur • Bestimmung der räumlichen Verteilung der elektrischen Leitfähigkeit bzw. des spezifischen elektrischen Widerstandes ,d. h. daß aus jedem Volumenelement genau soviel Strom ausfließt wie eintritt: 0 = J q t + = J J (5.12) Dies ist die physikalisch anschauliche Aussage, daß der aus einem Volumenelement austretende Leitungs-und Quellstrom der zeitlichen Abnahme der elektrischen Ladung des Volumenelements entspricht. In der Praxis können die vorstehenden Gleichungen stark vereinfacht werden: l s = J J (5.13) d. h. die "Quellen" des Leitungsstromes sind die "Senken" des Quellstromes. Damit reduzieren sich (5.5) und (5.9) außerhalb der Quellen auf das Ohmsche Gesetz = J E oder = E J 1 1 n n J J = erreicht. Sie sind bei Eintritt in einen schlechten Leiter (d. h. 2 1 <

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The behaviour of mise-à-la-masse anomalies near a vertical contact

Cited by 16 publications

References 17 publications

The mise-a-la-masse method

The mise-a-la-masse method

Mise‐à‐la‐masse interpretation using a perfect conductor in a piecewise uniform earth

Geoelektrik

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