Longitudinal Gradiometer

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 The remanent magnetization of rocks records past variations of the geomagnetic field whereby spatial changes in their magnetization give rise to magnetic anomalies. A magnetic anomaly is the magnetic field remaining after the Earth’s magnetic field has been removed form the observed amplitude of the local magnetic field.

A system of two Overhauser sensors (SeaSpy) with a set of 450m cables is deployed to recover the  local amplitude of the magnetic field.