Glossary of Geophysical Terms
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RCRA
The Resource Conservation and Recovery Act, passed by the US Congress in 1976 to regulate solid and hazardous waste disposal.
RI/FS
Remedial investigation/feasibility study.
Radar
A system whereby short electromagnetic waves are transmitted and any energy which is scattered back by reflecting objects is detected. Acronym for radio detection and ranging.
Radioactivity
Energy emitted as particles or rays during the decay of an unstable isotope to a stable isotope.
Receiver
The part of an acquisition system that senses the information signal.
Reflection coefficient
A term used in seismic reflection and GPR to describe the ratio of the reflected to incident amplitudes of a pulse reflected from an interface.
Remanent magnetization (Remanence)
Magnetization remaining after the application of magnetic field has ceased.
Repeat section
A short interval of log that is run a second time to establish repeatability and stability.
Resistivity (electrical)
Electrical resistance to the passage of a current, expressed in ohm-meters; the reciprocal of conductivity.
Resistivity logs
Any of a large group of logs that are designed to make quantitative measurements of the specific resistance of a material to the flow of electric current; calibrated in ohm-meters.
Resolution
Refers to the smallest unit of measurement that can be distinguished using a particular instrument or method; based on the ability to separate two measurements which are very close together.
Reversal
A typical distortion of normal-resistivity logs opposite beds that are thinner than the AM spacing; the effect is an apparent decrease in resistivity in the center of a resistive unit.
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