Propagation Characteristics of Magnetic Anomaly Signals in Different Medium

Marine weak magnetic survey is one of the important research directions at present. The typical signal of marine magnetic anomaly is low frequency, of which the magnetic field intensity is pT or even fT. In order to investigate the propagation characteristics of magnetic anomaly signals in the marine environment, the magnetic field variation of magnetic dipoles in different medium is verified by establishing a simulation model of magnetic dipoles. Then, we changed the distance of detection and frequency of the signal to verify the theory result in the MAXWELL. The simulation result indicated that the same source produces magnetic field intensity from hundreds fT to dozens pT at different distance in the marine medium. It proves that High Tc Superconducting QUantum Interference Devices (SQUIDs) meet the demand of marine magnetic anomaly detection.