The Physics Behind Electrical Resistivity
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- resistivity, electrical properties
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The physics behind electrical resistivity starts with how electric fields drive charge through a material. In geophysics, current and voltage measurements reveal the combined electrical response of soil, rock and pore fluids. Electrode geometry and modelling turn that response into information about the subsurface. Resistance describes opposition to current through a particular object or path and is measured in ohms. Resistivity describes...
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How Moisture and Salinity Affect Soil Resistivity
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- resistivity, electrical properties
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Moisture and salinity affect soil resistivity by changing the continuity and conductivity of pore-water pathways. Wetter soil often has lower resistivity, and dissolved salts can lower it further. The difficulty is distinguishing those effects from changes in texture, temperature and soil structure. Current in many soils travels mainly through water-filled pores. As soil wets, isolated films and pockets can become connected, allowing charge...
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What Rock Resistivity Reveals About Groundwater
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- resistivity, electrical properties
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Rock resistivity can reveal where subsurface conditions are consistent with water-bearing formations, how those formations change and whether saline water may be present. It cannot confirm a productive freshwater supply by itself: geology, water chemistry and borehole evidence are needed to interpret the electrical pattern. Many common rock-forming minerals conduct poorly, while dissolved ions allow pore water to carry current. A rock’s...
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How Gradiometry is used in building planning
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- gradiometry, geophysical surveys, archaeological surveys, ground condition surveys
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Gradiometry plays an important role in building planning by helping identify possible buried archaeology before construction begins. This article explains how gradiometry surveys work, what they can find, and why they are useful for developers, planners, and heritage specialists. Gradiometry is a way of measuring small changes in the Earth’s magnetic field across a piece of land. A gradiometer uses two sensors that are set...
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Uses of geophysical surveys on historical sites
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- geophysical surveys, archaeological surveys, ground mapping, geophysical and resistivity surveys
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Geophysical surveys are a useful way to explore historic sites without excavating the ground. This article explains how different survey methods can help archaeologists find buried walls, foundations, ditches, pits, roads, graves, and settlement layouts. It also looks at how these surveys help with planning excavation work, site management, and heritage protection across the UK. Geophysical surveys are used to study what is below...
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How is resistivity used in archaeology
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- resistivity surveys, archaeology surveys, geophysical landscaping, guide to resistivity
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Resistivity is an important archaeological survey that helps reveal what may be hidden beneath the ground without digging. This article explains how resistivity works, why soil moisture affects the results, and how different readings can point towards buried walls, ditches, floors, foundations, and other features. Resistivity is a way of looking for buried features without digging. It's a survey method that measures how strongly the...
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