The MT signal is measured using the same seafloor receivers as used for a conventional controlled source electromagnetic (CSEM) survey.

However, the MT signal strength depends on solar activity interacting with Earth’s magnetosphere. To ensure good data quality, the receivers are kept on the seafloor for several days, continuously measuring the natural variation of the electromagnetic fields.

Resistivity models from MT inversion images deep structures such as basement and delineates complex salt and volcanic structures.