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.
BGU Geomagnetic Lab 