Abstract
HARRISON and SOUTHAM (1991) point out the many benefits of magnetic gradiometry including the enhancement of short-wavelength (nearby) anomalies relative to long-wavelength (far away) anomalies, and the heavy attenuation of diurnal or magnetic storm variations usually present in total-field measurements. In addition, they point out that gradient profiles, like field component profiles, can be used to test for anomaly linearity and strike angle. HARRISON and SOUTHAM (1991) propose using a SQUID gradiometer to measure the gradient tensor components due to crustal sources and suggest that SQUID gradiometers can be made sensitive enough to measure sea-floor spreading anomalies from orbiting satellites.We believe that all of the benefits attributed to tensor gradiometry can be obtained with total-field gradiometry as well. First we will describe the capabilities of existing gradiometer systems, then we will describe how they can be used to obtain the same information as SQUID gradiometers.
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