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Sensitivity of Seismo-electric Waveforms and Electric Noise to Electrode Configuration
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, Near Surface Geoscience 2015 - 21st European Meeting of Environmental and Engineering Geophysics, Sep 2015, Volume 2015, p.1 - 5
Abstract
The seismo-electric exploration method aims to analyse the electromagnetic signals generated when seismic waves excite, and then propagate through a fluid-filled porous or fractured medium. Seismo-electric signals are obtained by firing a seismic source and recording the resulting electric fields. Such experiments usually allow one to detect the dominant contributions of the seismo-electric response, namely the electric signature of seismic surface waves and guided waves propagating in the near surface. Of more interest are the electromagnetic waves generated at depth when seismic waves cross an interface. These signals are much more difficult to discern due to their very weak amplitudes and because of the ubiquitous man-made electric noise that dominates the records. As a workaround, we investigate here the possibilities offered by multi-electrode arrays to enhance the EM interface response and mitigate the power line noise at the same time.