Magnetotellurics – MT

Magnetotellurics aims to produce a 3D resistivity model of the ground by recording naturally occurring electric and magnetic fields at the surface. Its depth of penetration ranges from tens of meters up to tens of kilometers.

The DIAS32-MT system is designed for the acquisition of MT time series. Capable of recording up to 19,200 samples per second, the system is equipped for the acquisition of Broadband-MT (BBMT), Audio-Magnetotellurics (AMT), and controlled-source AMT (CSAMT).

The system is an upgrade of the DIAS32 DCIP single-channel receivers and is based on the same wireless communication technology. Ultimately designed to be integrated into a combined 3D DCIP – MT acquisition, the receivers can also be used for MT-only surveys.

The wireless communication technology allows a geophysical operator to perform initial data quality control before recording data, through data streaming and ground resistance measurements.


DIAS32 MT Advantages

  • Survey designs and optimization using 2D/3D forward modeling and inversion with SimPEG.
  • Low-noise MFS07e magnetic induction coil sensors from Metronix Geophysics.
  • A wide array of electrodes are available, from stainless steel for AMT surveys to non-polarizable porous pots for long period MT recordings.
  • Low instrumental noise from the receiver.
  • Complete flexibility on survey design (sparse magnetic sensors w/ high density electrics, high density E and H).
  • Compact receiver design, easy to camouflage in sensitive areas, with a plug and play option to record from the interface without the need for a geophysical operator.

Operational Advantages

  • For long-period recording, data can be streamed without accessing the remote site.
  • Lighter weight for hybrid MT layout (Telluric-Magnetotelluric, only TE mode for 2D surveys…), no need for a full acquisition unit at each station.


  • EDI files – standard in MT community.
  • Apparent resistivity maps.
  • 2D sections/3D resistivity models
  • Orientation information