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1 Acta Geophysica Polonica

1 2001

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Tests of equipment for electric field observation in deep magnetotelluric soundings

Semenov V., Hempfling R., Junge A., Marianiuk J., Schmucker U.

Acta Geophysica Polonica

2001

Vol. 49, nr 3

373-388

The quality of natural geoelectrical field observations was studied with special attention to long period signals. Two different types of electrodes, Ag/AgCl electrodes designed in Germany and Cu/CuSO4 electrodes designed in Poland, were used simultaneously to estimate the accuracy of the measurements. The difference between the recorded signals was found to be 9-150 miV (including noises of amplifiers of about 4 miV) for periods from 5 s to 2 days, respectively. These values show that the electrical fields induced by daily geomagnetic variations (expected signal is about 1-3 mV/km) can be registered reliably by 200-m dipoles, at least during summer time, in mid-latitudes by both considered types of electrodes, if other possible hindrances like the temperature influence on amplifier or the bad quality of cables are excluded. Main experiments have been carried out at the geomagnetic observatory Belsk in Poland, situated at the margin of the East-European Platform. This position may be responsible for the observed considerable difference between the electrical field components along and across the platform boundary for the harmonics of daily variation.