Journal of Geological Society of India (Online archive from Vol 1 to Vol 78)

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Natural Electromagnetic Radiation (EMR) and its Application in Structural Geology and Neotectonics


Affiliations
1 Institut fuer Angewandte Geowissenschaften, Universitaet Karlsruhe (TH), Hertzstrasse 16, 76187 Karlsruhe, Germany
2 Gesellschaft fur Erkundung and Ortung, Yorckstrasse 36, 76183 Karlsruhe, Germany
     

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Natural electromagnetic radiation (EMR) impulses are emitted from rocks under stress. Electromagnetic emission may start during crystal deformation prior to and during the nucleation phase of nanocracks. The emission direction is either parallel with or normal to the crack surfaces. The EMR magnetic component is measured by the sensor or aerial of an instrument, the Cerescope, at frequencies from 5 to 50 kHz. Measurements at the surface show directions of recent stresses remarkably well. A calibration of EMR intensity in terms of stress magnitude is possible in tunnels, where the overburden pressure can be calculated. Two examples from the Upper Rhine Graben and NW India show EMR line measurements. In both cases, stress concentrations at fault or bedding surfaces can be detected. These surfaces can be regarded as tectonically active. Two further examples of EMR determinations in tunnels give more detailed information on the regional stress field. The example from the Swiss Jura fold-and-thrust belt shows directional results, with different directions beneath and above the regional detachment horizon at the base of the belt. The example from central Scandinavia shows a late Caledonian shear zone as a boundary between two recent stress domains, and gives absolute values of stress.

Keywords

Natural Electromagnetic Radiation (EMR), Neotectonics, Nanofractures, Active Faults, Recent Stress.
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  • Natural Electromagnetic Radiation (EMR) and its Application in Structural Geology and Neotectonics

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Authors

Reinhard O. Greiling
Institut fuer Angewandte Geowissenschaften, Universitaet Karlsruhe (TH), Hertzstrasse 16, 76187 Karlsruhe, Germany
Hennes Obermeyer
Gesellschaft fur Erkundung and Ortung, Yorckstrasse 36, 76183 Karlsruhe, Germany

Abstract


Natural electromagnetic radiation (EMR) impulses are emitted from rocks under stress. Electromagnetic emission may start during crystal deformation prior to and during the nucleation phase of nanocracks. The emission direction is either parallel with or normal to the crack surfaces. The EMR magnetic component is measured by the sensor or aerial of an instrument, the Cerescope, at frequencies from 5 to 50 kHz. Measurements at the surface show directions of recent stresses remarkably well. A calibration of EMR intensity in terms of stress magnitude is possible in tunnels, where the overburden pressure can be calculated. Two examples from the Upper Rhine Graben and NW India show EMR line measurements. In both cases, stress concentrations at fault or bedding surfaces can be detected. These surfaces can be regarded as tectonically active. Two further examples of EMR determinations in tunnels give more detailed information on the regional stress field. The example from the Swiss Jura fold-and-thrust belt shows directional results, with different directions beneath and above the regional detachment horizon at the base of the belt. The example from central Scandinavia shows a late Caledonian shear zone as a boundary between two recent stress domains, and gives absolute values of stress.

Keywords


Natural Electromagnetic Radiation (EMR), Neotectonics, Nanofractures, Active Faults, Recent Stress.

References