Magnetotelluric component of the geophysical instrument pool

The magnetotelluric instruments are part of the Geophysical instrument pool Potsdam (GIPP) which means that the instruments are generally available for academic use to all German Universities. The allocation of the instruments is decided by the GFZ Executive Board, following the recommendation of the GIPP Steering Board (Lenkungsausschuß). The application form can be found here. All of the magnetotelluric instruments described below are stored and maintained at the premises of the Geomagnetic Observatory in Niemegk. Please contact Oliver Ritter for any questions or inquiries regarding the instruments listed below:

Overview of principle parts necessary to set up a MT site

SPAM MK IV data acquisition system

SPAM Mk IV instruments are Short Period Automatic Magnetotelluric instruments which were developed by GIPP-MT together with Graham Dawes from the University of Edinburgh. The instruments operate in the frequency range between 50 kHz – DC with 24-bit resolution and provide real-time operation. The instruments are usually used in combination with SPAM IV sensor boxes and induction coil magnetometers.
Total number available in GIPP-MT: 50


Earth Data Logger (EDL, 6 channels)

6-channel 24 bit systems which can be used as MT data loggers for broad band and long period recordings (500 Hz – DC), typically in combination with CASTLE sensor boxes. These instruments are also used for seismic experiments.
Total number available in GIPP: 35


SPAM Mk IV sensor boxes

SPAM IV sensor boxes provide the interface to connect electrodes and induction coil magnetometers to data recording instruments such as the SPAM Mk IV and EDL systems. Up to 5 sensors can be connected to a SPAM IV sensor box.
Total number available in GIPP-MT: 50


CASTLE sensor boxes

CASTLE sensor boxes provide the interface to connect electrodes and induction coil magnetometers to data recording instruments such as the S.P.A.M. Mk IV and EDL systems. Up to 3 sensors can be connected to a CASTLE sensor box.
Total number available in GIPP-MT: 70


Control boxes

Control boxes are used to access and programme SPAM Mk IV or CASTLE sensor boxes with a laptop computer (USB connection). Sensor box set-up includes amplification, analogue filter settings, indcution coil mode, etc. A control box is not required for SPAM Mk IV systems
Total number available in GIPP-MT: 15


Metronix MFS05 induction coils

Metronix induction coils are used for broad band magnetotelluric recordings. They are connected to sensor boxes. The MFS05 sensors operate in the frequency range 1 kHz-1000 s.
Total number available in GIPP-MT: 30


Metronix MFS06 induction coils

Metronix induction coils are used for broad band magnetotelluric recordings. They are connected to sensor boxes. The MFS06 sensors operate in the frequency range 8 kHz-1000 s.
Total number available in GIPP-MT: 80


Metronix MFS07 induction coils

Metronix induction coils are used for broad band magnetotelluric recordings. They are connected to sensor boxes. The MFS07 sensors operate in the frequency range 50 kHz-100 s.
Total number available in GIPP-MT: 30


Geomagnet fluxgate magnetometer

Geomagnet flux-gate magnetometers consist of two units: the sensor unit with anti-tilt construction and the electronic unit to drive the sensor. The instrument is usually operated as a variomenter (the magnetic main field is removed from the signal). Frequency range is 1 Hz to DC.
Total number available in GIPP-MT: 30


Pulz / Magson Fluxgate magnetometer

The Pulz / Magson magnetometer is a triaxial (X,Y,Z) ring core fluxgate magnetometer. The magnetometer system consists of a Magson sensor head and electronics box. The magnetometer requires the high dynamic range of a 24-bit data acquisition system (EDL) as the main-field is not compensated. Frequency range is 1 Hz to DC.
Total number available in GIPP-MT: 10


Ag-AgCl electrodes

The non-polarisable electrodes for all magnetotelluric work which are designed and manufactured by the GIPP-MT.
Total number available in GIPP-MT: 550


Cables

Cables are everywhere: between sensors and sensor boxes, between sensor box and data logger, for GPS antennas, to connect batteries, etc.
Total number available in GIPP-MT: hundreds

Contact

Profile photo of  Prof. Dr. Oliver Ritter

Prof. Dr. Oliver Ritter
Near-surface Geophysics

Telegrafenberg
Building E, room 423
14473 Potsdam
tel. +49 331 288-1257