Offshore Use of the Self‐potential Method*

Corwin, Robert F.

doi:10.1111/j.1365-2478.1976.tb00386.x

Cited by 27 publications

(17 citation statements)

References 11 publications

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“…These generate some anomalies with long wavelength and high amplitudes. In addition, a similar potential is also observed on shallow coal bums (Corwin, 1976).…”

Section: Introductionsupporting

confidence: 68%

“…Subsequently, the method also has been used in the investigation of wells, dykes and reservoir floors, and for geothermal and earthquake prediction research (Ogilvy et al, 1969;Bogoslovsky and Ogilvy, 1973;Corwin, 1976Corwin, , 1990; Corwin and Hoover, 1979;Ercan et al, 1986). One of the known SP applications in archaeological research was carried out by Wynn and Sherwood (1984) on different archaeological areas (Fort Washington, Piscataway and Harpers Ferry Sites).…”

Section: Introductionmentioning

confidence: 99%

“…This effect should also be considered in archaeological research. According to Corwin (1976), variations in soil chemistry, temperature or moisture content probably account for much of the background noise seen in SP data. Background noise anomalies of around f10 mV appear when the soil is dry.…”

Section: Introductionmentioning

confidence: 99%

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An application of the self-potential (SP) method in archaeogeophysical prospection

Drahor

Akyol

Dilaver

1996

Archaeol. Prospect.

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Usage of the self‐potential (SP) method on archaeological sites has been very limited and the phenomena that form the SP anomalies are not very well known. We believe that the vertical capillary water flows around stone walls that can be encountered frequently in archaeological sites, the porosity of the soil surrounding the archaeological structures, the moisture and clay ratio of the soil, and the changes in pH value of the soil, may form the SP anomalies. Moreover, an SP anomaly also may be formed if there is a moisture condition cutting the sulphuric and oxidized deposits under the earth. We determined, by our research, that the SP method can be very important, especially for determining the soil distribution and for archaeological research. The study was carried out on an Assyrian Tread Colony Period artificial hill in Acemhöyük, the chemical and physical structure of which was changed significantly after a large fire in approximately 1789±50 bc. The structure boundaries were found by interpreting the anomalies obtained from analytical modelling techniques, and an analysis of the SP mechanism of the area was attempted. In addition, the noise on the anomalies was eliminated by signal analysis techniques, thus enabling us to interpret the results more precisely. © 1996 John Wiley & Sons, Ltd.

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“…These generate some anomalies with long wavelength and high amplitudes. In addition, a similar potential is also observed on shallow coal bums (Corwin, 1976).…”

Section: Introductionsupporting

confidence: 68%

Section: Introductionmentioning

confidence: 99%

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An application of the self-potential (SP) method in archaeogeophysical prospection

Drahor

Akyol

Dilaver

1996

Archaeol. Prospect.

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“…The SP method can also be applied under water. Using this measurement technique, leaks at the bottom of a reservoir or in the upstream slope of a dam have been detected (Ogilvy et al 1969) and SP anomalies of up to -300 mV due to offshore extensions of conductive mineral deposits have been recorded by Corwin (1976). Moreover, when the SP method is applied on the upstream face of a dam, a part of the dam body that is inaccessible to onshore geophysical measurements can be examined.…”

Section: Introductionmentioning

confidence: 99%

Underwater self‐potential measurements in the safety assessment of dams

Rozycki¹,

Olalla

Fonticiella

et al. 2008

Near Surface Geophysics

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A small earth‐cored dam, the water balance of which indicated water losses, was chosen to test the applicability of the underwater self‐potential (SP) method. The data were recorded using a measurement system composed of an electrode dragged over the upstream face of the dam and attached to a well‐logging instrument. The measured electrical potential was referred to a fixed point inside the reservoir and near to the pool water level. The obtained SP data were split into regional and local components. The regional component was generated using an existing correlation between a vertical SP water gradient and the water depth of the upstream slope shape of the dam. The residual SP field was obtained by subtraction of the regional component from the recorded data. The residual SP field showed several anomalies, one of which coincided with the axis of the outlet conduit. Depth estimation gave a value equal to the position of the tube. Some of the anomalies suggested the presence of suffusion processes that had developed along the upstream slope, similar to sink‐hole dissolution. The SP anomalies and the conductive bodies interpreted from the direct current measurements which were carried out on the crest of the dam, showed good spatial correlation; this indicated the possibility of hydraulic connections through preferential flow paths between the upstream face and the body of the dam. In quantitatively interpreting the SP anomalies, their relative positions on the upstream face must be taken into account, due to possible electrical‐potential distortions at the rock‐fill/water and water/ air limits.

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“…A less commonly used method is the self-potential (SP) method, which looks for naturally occurring anomalies in electrical potential which can arise from buried conductive bodies (e.g., massive sulfides, graphite shear zones) (Sato and Mooney, 1960) or from streaming potentials caused by fluid flow (e.g., groundwater) (Revil and Jardani, 2013). The SP method has been shown to work in marine environments, where both graphite and massive sulfide bodies have been detected by marine SP systems (Brewitt-Taylor, 1975;Corwin, 1976;Von Herzen et al, 1996;Heinson et al, 1999Heinson et al, , 2005Beltenev et al, 2007Beltenev et al, , 2009Cherkashov et al, 2010;Shilov et al, 2012;Cherkashev et al, 2013). In a few cases, massive sulfides at the Mid-Atlantic Ridge were found to produce an SP anomaly even where no hydrothermal activity was present (Cherkashev et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

A self-potential investigation of submarine massive sulfides: Palinuro Seamount, Tyrrhenian Sea

et al. 2017

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The self-potential (SP) method detects naturally occurring electric fields which may be produced by electrically conductive mineral deposits such as massive sulfides. Recently, there has been increasing interest in applying this method in a marine environment to explore for seafloor massive sulfide (SMS) deposits which may contain economic resources of base and precious metals. While SMS sites that are associated with active venting and are not buried under sediment cover are known to produce an SP signal, the effectiveness of the method at detecting inactive and sediment-covered deposits remained an outstanding question. We built an instrument capable of recording SP data in a marine setting. We carried out a test of the instrument at the Palinuro Seamount in the Tyrrhenian Sea. Palinuro is one of only a few known sites containing an SMS occurrence which is buried under sediment and not associated with active hydrothermal venting, although diffuse seepage of hydrothermal fluids is known to occur at the site. Elevated electric field strengths recorded in and near the site of previously drilled massive sulfide samples are on the order of 1-3 mV/m. A second zone of high field strengths was detected by us to the north of the drilling area where gravity coring later confirmed the existence of massive sulfides. Our observations indicate that an SP signal can be observed at the site of SMS mineralization even when the mineralized zone is shallowly buried and active hydrothermal venting is not present. These observations could aid in the planning of future marine research expeditions which use the SP method in the exploration of seafloor massive sulfides.

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Offshore Use of the Self‐potential Method*

Cited by 27 publications

References 11 publications

An application of the self-potential (SP) method in archaeogeophysical prospection

An application of the self-potential (SP) method in archaeogeophysical prospection

Underwater self‐potential measurements in the safety assessment of dams

A self-potential investigation of submarine massive sulfides: Palinuro Seamount, Tyrrhenian Sea

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