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Wednesday, 22 January 2025

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Electrical resistivity tomography

Electrical resistivity tomography (ERT) or electrical resistivity imaging (ERI) is a geophysical technique for imaging sub-surface structures from electrical resistivity measurements made at the surface, or by electrodes in one or more boreholes. If the electrodes are suspended in the boreholes, deeper sections can be investigated. It is closely related to the medical imaging technique electrical impedance tomography (EIT), and mathematically is the same inverse problem. In contrast to medical EIT however ERT is essentially a direct current method.

A related geophysical method, induced polarization, measures the transient response. The technique evolved from techniques of electrical prospecting that predate digital computers, where layers or anomalies were sought rather than images. Early work on the mathematical problem in the 1930s assumed a layered medium (see for example Langer, Slichter). Tikhonov who is best known for his work on regularization of inverse problems also worked on this problem. He explains in detail how to solve the ERT problem in a simple case of 2-layered medium. During the 1940s he collaborated with geophyicists and without the aid of computers they discovered large deposits of copper. As a result, they were awarded a State Prize of Soviet Union.

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This page contains text from Wikipedia, the Free Encyclopedia - https://wn.com/Electrical_resistivity_tomography

Electrical resistivity and conductivity

Electrical resistivity (also known as resistivity, specific electrical resistance, or volume resistivity) is an intrinsic property that quantifies how strongly a given material opposes the flow of electric current. A low resistivity indicates a material that readily allows the flow of electric current. Resistivity is commonly represented by the Greek letter ρ (rho). The SI unit of electrical resistivity is the ohm⋅metre (Ω⋅m) although other units like ohm⋅centimetre (Ω⋅cm) are also in use. As an example, if a 1 m × 1 m × 1 m solid cube of material has sheet contacts on two opposite faces, and the resistance between these contacts is 1 Ω, then the resistivity of the material is 1 Ω⋅m.

Electrical conductivity or specific conductance is the reciprocal of electrical resistivity, and measures a material's ability to conduct an electric current. It is commonly represented by the Greek letter σ (sigma), but κ (kappa) (especially in electrical engineering) or γ (gamma) are also occasionally used. Its SI unit is siemens per metre (S/m) and CGSE unit is reciprocal second (s⁻¹).

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This page contains text from Wikipedia, the Free Encyclopedia - https://wn.com/Electrical_resistivity_and_conductivity

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Latest News for: electrical resistivity tomography

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Yukon Metals identifies priority drill targets at Birch copper-gold project

Mining 09 Jan 2025

Yukon Metals (CSE ... YMMCF) reported on Wednesday results of an electrical resistivity tomography (ERT) and induced polarization (IP) geophysical survey program over its Birch property 65 km northeast of Burwash Landing in Canada’s Yukon Territory.

Edit

Yukon Metals discovers high-priority drill targets at Birch Project, Yukon

Resource World 08 Jan 2025

provided results of an Electrical Resistivity Tomography (ERT) and Induced Polarization (IP) geophysical survey program over its 7,000-hectare Birch Property located 65 km northeast of Burwash Landing, Yukon.

Edit

Archaeologists Just Discovered Something Extraordinary Underneath The Scene Of A Nazi Massacre

IFL Science 02 Jan 2025

Researchers from Israel, Lithuania, Canada, and the US used electrical resistivity tomography to avoid disturbing the bodies in the mass graves, an imaging technique commonly used in mineral and oil ...

Edit

Peloton Minerals to conduct geophysics at North Elko Lithium Project, Nevada

Resource World 21 Nov 2024

tTEM is a mobile ground-based transient system used for rapidly mapping subsurface electrical conductivities over large areas ... Electrical Resistivity Tomography (ERT) surveys ... subsurface resistivity.

Edit

CMP determined to use all technological means available to fulfill its mission

CyprusMail 09 Nov 2024

This is basically an electrical resistivity tomography and that entails putting a steel electrode and ground every 50cm and then injected current at different spacing ... So, if the electricity can flow ...

Edit

New methods to be used to find missing remains

CyprusMail 29 Oct 2024

The two scientists will come from Wisconsin Eau Claire university. They will use methods including Ground Penetrating Radar (GPR) and Electrical Resistivity Tomography (ERT) ... ....

Edit

Keir Starmer tells Brits they face a

The Daily Mail 28 Oct 2024

The underground tunnels were revealed using a combination of ground penetrating radar, electric resistivity tomography, and seismic noise tomography ... tomography, and seismic noise tomography.

Edit

QIMC Unveils Landmark Geophysical Survey Findings in its natural hydrogen Ville Marie project

Resource World 24 Oct 2024

The INRS team carried out a very high-resolution geoelectrical tomography (electrical resistivity and chargeability) survey to produce electrical resistivity and chargeability imagery along lines 1 and 3Est and north of line 3E.

Edit

Network of subterranean chambers and tunnels identified beneath Mitla

Heritage Daily 11 Oct 2024

The team used advanced geophysical methods such as Ground Penetrating Radar (GPR), Electric Resistivity Tomography (ERT), and Seismic Noise Tomography, revealing a large void beneath the main altar at ...

Edit

Project Lyobaa Confirms Subterranean Chambers and Tunnels under Mitla, Oaxaca

GetNews 25 Sep 2024

Using advanced geophysical methods such as Ground Penetrating Radar (GPR), Electric Resistivity Tomography (ERT), and Seismic Noise Tomography, researchers confirmed the existence of a large void ...

Edit

Underground Chambers and Tunnels Confirmed at Mitla

Ancient Origins 06 Sep 2024

Using advanced geophysical technologies, including ground-penetrating radar, electric resistivity tomography, and seismic tomography, the team from ARX Project Lyobaa has provided the first solid evidence of what was long suspected.

Edit

Yukon Metals samples up to 14.1 g/t gold and 4,260 ppm copper at Birch property, Yukon

Resource World 03 Sep 2024

Yukon Metals Corp ... Yukon Metals will follow up on the soils results by using a combination of electrical resistivity tomography and induced polarization geophysics to delineate bedrock structure ... Al., 2011) ... ....

Edit

Archaeologists found a secret chamber at the base of the Great Pyramid of Giza, and ...

Business Insider 30 May 2024

Archaeologists used radar and other methods to find an underground structure near the pyramids and cemeteries in Giza, Egypt ... Archive Photos via Getty Images ... ground-penetrating radar (GPR) and electrical resistivity tomography (ERT) ... ....

Edit

Scientists Detect "Anomaly" Underground Near Great Pyramid

Futurism 21 May 2024

Using ground penetrating radar in combination with a technique known as electrical resistivity tomography (ERT), a team of researchers from Egypt and Japan has discovered two underground structures ...

Edit

Egypt: Mysterious ‘anomaly’ found buried deep under Great Pyramids of Giza

Interesting Engineering 20 May 2024

Researchers using ground-penetrating radar (GPR), along with electrical resistivity tomography (ERT), have found what they describe as an ‘L-shaped anomaly’ in the western cemetery near the Great Pyramids of Giza in Egypt.

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