earthresistivity.comEarth Resistivity Measures Electrical Resistivity Soil Rock Resistance

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Title:Earth Resistivity Measures Electrical Resistivity Soil Rock Resistance

Description:Electrical Earth Resistivity Equipment in Engineering Geophysics Measures Soil Resistance AGI SuperSting Meters Geometrics OhmMapper 2-D and 3-D Surveys

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Earth Resistivity Measures Electrical Resistivity Soil Rock Resistance Earth Resistivity for Near Surface Engineering Geophysics and Geophysical Surveys Operated by Geophysicists ? Navigation Home Electrical Earth Resistivity Surveys in Geophysics Measures Soil and Rock Resistance About Earth Resistivity.Com Terms of Use Electrical Resistivity Imaging Instruments This is a single Electrical Resistivity Imaging Instruments Image to act like a header image. This is a single Electrical Resistivity Imaging Instruments Image to act like a header image. Electrical Earth Resistivity Surveys in Geophysics Measures Soil and Rock Resistance Earth resistivity measurements in geophysics are often used to map changes in electrical resistivity below the ground’s surface. Engineering geophysics incorporates electrical earth resistivity methods in various applications, which range from characterizing geologic conditions at a depth of 100’s of feet to measuring the electrical resistivity of a sample placed in a small handheld container. As an example, earth resistivity measurements can be used to map out clays, sands, gravels, frac sand deposits, types of rock, levee areas, groundwater, fracture joint systems, faults, karst features, variations in porosity, changes in cementation, voids, graves, archaeological sites, groundwater contamination, and saltwater intrusion, to name a few. For help today, fill out Earth Resistivity.Com’s form. Scroll down to skip over the form or go to the bottom of this page and leave a comment for someone to help you find an answer about earth resistivity geophysical methods. We will respond. 3 Questions So We Can Better Help EarthResistivity.Com 0% Progress: What is your application? Mapping geology. Environmental issues. Groundwater investigation. Other What resolution do you need? Need high resolution along a line. Need to map lateral variations over large areas. Other For someone to respond to this form, we will need a name and an email address entered on the next page. If you do not want anyone to contact you, just leave it blank. All Done? This is optional. Select how you wish to be contacted. Optional Name: Provide email address for someone to email you: Provide a telephone number for someone to call you: Provide a short note if you want to: Next >< Back Earth resistivity equipment uses little electrical power to measure the resistivity of near surface soils. Determining the electrical resistivity of the subsurface for a ground plane around a large power plant or for geologic conditions 100’s of feet below grade usually demands a larger more stable power supply than a unit powered by a few AA batteries. Larger earth resistivity meters that utilize automobile sized batteries or even gas powered generators generally fall in to the category of geophysical instruments and can be rented from K.D. Jones Instruments. This type of geophysical equipment is designed not only for greater depths of penetration, but for adverse weather, rugged field conditions, and poor site conditions. In my opinion, good electrical resistivity equipment is built by a hand full of manufactures. Two U.S. companies that have worked hard at meeting the geophysicists’ needs are AGI and Geometrics. Multielectrode Earth Resistivity Array Geometrics OhmMapper Capacitive Coupled Resistivity Array One of AGI’s most popular units is the SuperSting R8. In addition to being capable of acquiring profile data or resistivity soundings, it is a programmable multiple electrode resistivity MER system capable of acquiring 1000’s of readings with a single array setup. The arrays come in unlimited lengths and configurations. An 84 electrode system with takeouts spaced 5.25 meters apart can reach 100’s of feet deep. A 2-D resistivity line can be “rolled” end to end for as far as you have space. The same system can be configured to detail the top 10 feet of soil or create a 3-D electrical resistivity representation of the subsurface. The unit is programmable for multiple array configurations (e.g. Wenner, Schlumberger, Dipole-Dipole, Pole-Dipole, Pole-Pole, or user defined). While the SuperSting provides a variety of possibilities, it is mostly used along a single straight line and can not be towed. In contrast, Geometerics OhmMapper is a towed array that is cable of covering spatially large areas, such as, fields, parking lots, landfills, and large commercial sites. The unit is generally towed by a person (sometimes a vehicle) and is pulled across a site from one end to the other. Using the OhmMapper to acquire closely spaced lines, allows the geophysicist to map lateral changes across a site. Multiple lines along a single transect can yield cross-sections of electrical resistivity, much like the SuperSting. 36 Responses to “Electrical Earth Resistivity Surveys in Geophysics Measures Soil and Rock Resistance” Ali BAKAR January 18, 2014 at 12:39 am # Hi, i am using GPR method(sir-3000) to get image underground to depth 30m but i found that this radar cant go down more than 6-7m. now can you advise me if earth resistivity can give a good image with good resolution and can shows the caves at this depth if the earth is sand, silt, gravels, and clay over bedrock. Reply Achieng November 6, 2013 at 6:57 pm # I would like to map groundwater contamination by Nitrogenous fertilizer. What equipment would best suit my work.? Thanks in advance. Reply geophysics November 8, 2013 at 12:11 pm # Geophysically, I have documented changes in electrical resistivity or electrical conductivity. Electrical resistivity methods provide some of the greatest detail in cross-section, using multielectrode electrical resistivity imagining methods. I have produced great results using AGI’s SuperSting R8 system with 84 electrodes. Electrical terrain conductivity measurements using a Geonics EM-34, for deep penetration, or Geonics EM31 for shallow surveys works well to survey spatially large areas or the lateral extent of contaminiation. In either case, you need a electrically detectable contrast that correlates well with the contamination from the Nitrogenous fertilizer. This is generally dependent on the soil, rock, and/or groundwater conditions, as well as access. Reply Markus Lagmanson October 24, 2013 at 4:32 pm # Hi there, Just wanted to say hi and that we at AGI are happy to see the good work you do representing our resistivity equipment. Cheers, Markus Reply Geophysics October 24, 2013 at 5:21 pm # Thanks for the support. Good geophysical equipment, like AGI’s SuperSting R8 and the multielectrode resistivity arrays for imaging the subsurface, makes a difference. Good luck to you at AGI. Reply Sink Holes June 2, 2013 at 11:18 am # How well does electrical resistivity work for sink holes? Reply Geophysics June 2, 2013 at 1:58 pm # Electrical earth resistivity measurements are one of the best geophysical methods to use when looking for sinkholes. However, the sinkholes need to be fairly large. Small sinkholes at depth are nearl...

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