Crustal conductivity anomalies in central Sweden and southwestern Finland
Lateral conductivity variations in the Earth's crust in central Sweden and southwestern Finland were mapped using magnetic field variations recorded simultaneously by 29 Gough-Reitzel-type magnetometers in summer 1985. Three events of 3 or 4 h were digitized and analysed to obtain single-statio...
| Published in: | Geophysical Journal International |
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| Main Authors: | , , , , |
| Format: | Text |
| Language: | English |
| Published: |
Oxford University Press
2002
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| Subjects: | |
| Online Access: | http://gji.oxfordjournals.org/cgi/content/short/150/3/695 https://doi.org/10.1046/j.1365-246X.2002.01740.x |
| Summary: | Lateral conductivity variations in the Earth's crust in central Sweden and southwestern Finland were mapped using magnetic field variations recorded simultaneously by 29 Gough-Reitzel-type magnetometers in summer 1985. Three events of 3 or 4 h were digitized and analysed to obtain single-station induction arrows and interstation horizontal field transfer functions. The 1985 magnetometer array covered part of the BEAR (Baltic Electromagnetic Array Research) array operated in 1998 on the Fennoscandian Shield. Results from eight BEAR sites are used to control and to supplement the 1985 array results. The conductivity of the crust was found to increase in the western part of the array in western central Sweden. Crustal conductors were found both in the western part of the array and in the Baltic Sea area in the eastern part of the array. 3G-D modelling based on the induction arrows revealed a major conductivity anomaly in the middle and lower crust under the archipelago of Southwest Finland. |
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