Measurement of a magnetic field over a region to locate contrasts in subsurface magnetization. Temporal background changes and cultural interference must be distinguished from spatial magnetic anomalies.
A stationary magnetometer recording time variation of the background magnetic field while a moving instrument measures spatial variation. Subtracting the synchronized base changes reduces temporal contamination.
An absolute scalar magnetometer that infers from the free Larmor precession frequency of polarized protons. It measures field strength rather than field direction.

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