Interpretation of deep DC soundings in the Baltic Shield

Details Interpretation of deep DC soundings in the Baltic Shield Interpretation of deep DC soundings in the Baltic Shield

Apr 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989pepi...54..149v&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 54, Issue 1-2, p. 149-155.

Physics

9

Scientific paper

A powerful generator supplies 6-8-s current pulses with the amplitude of ~ 2 × 104 A in a 7-km cable earthed on the Kola Peninsula coast. The electric field was measured at around 100 sites in the Soviet Union and Finland to about a 700-km distance from the source. Additionally, a diesel generator was used for separations between the source and the receiver < 100 km. Observations indicate an increase of the apparent resistivity to 104 ω m at separations up to ~ 200 km with a further decrease of the resistivity at larger separations owing to the increase of the deep electric conductivity. This gives the possibility of estimating the depth-integrated (transverse) resistivity if the near-surface conductance is known. For conductance values of ~ 3 S, the depth-integrated resistivity is near 4 × 109 ω m2.

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