Geomagnetic and magnetotelluric soundings in the area of the Central European rift system
Abstract
The conductivity structure connected with the Central European rift system was investigated with regard to geothermal energy sources using methods of geomagnetic depth sounding and magnetotelluric sounding. Sensors, a data acquisition system, and a software package for data handling and data analysis were developed. During a test campaign in the Leinegraben area and two field campaigns in the Rheingraben area, geoelectric and geomagnetic variations in the period range from 6 seconds to 24 hours were registrated. At base sites in the Rheingraben and the Black Forest, models of the vertical profile of the electrical conductivity were determined, while at sites in between the lateral conductivity variations were investigated. The perturbation of magnetic field in the region of the Rheingraben is strong and frequency dependent. The higher frequencies (low penetration depths) show the influence of the graben sedimentary structure, filling only the narrow graben area, and strong currents along the center of the graben. The lower frequencies (deeper penetration depths) reflect the deeper, probably broader conductivity structure.
- Publication:
-
Final Report
- Pub Date:
- August 1981
- Bibcode:
- 1981goeg.rept.....R
- Keywords:
-
- Europe;
- Geological Faults;
- Geothermal Resources;
- Magnetic Surveys;
- Sounding;
- Telluric Currents;
- Anomalies;
- Data Acquisition;
- Depth Measurement;
- Electrical Resistivity;
- Geophysics