Articles | Volume 10, issue 1
Geosci. Instrum. Method. Data Syst., 10, 81–90, 2021
Geosci. Instrum. Method. Data Syst., 10, 81–90, 2021

Research article 15 Apr 2021

Research article | 15 Apr 2021

Suppression of very low frequency radio noise in transient electromagnetic data with semi-tapered gates

Jakob Juul Larsen et al.

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Cited articles

Auken, E., Boesen, T., and Christiansen, A. V.: A Review of Airborne Electromagnetic Methods With Focus on Geotechnical and Hydrological Applications From 2007 to 2017, Adv. Geophys., 58, 47–93,, 2017. a
Auken, E., Foged, N., Larsen, J. J., Lassen, K. V. T., Maurya, P. K., Dath, S. M., and Eiskjær, T. T.: tTEM – a towed TEM-system for detailed 3D imaging of the top 70 meters of the subsurface, Geophysics, 84, E13–E22,, 2019. a, b, c
Balch, S. J., Boyko, W. P., and Paterson, N. R.: The AeroTEM airborne electromagnetic system, The Leading Edge, 22, 562–566,, 2003. a
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Barr, R., Jones, L., and Rodger, C. J.: ELF and VLF radio waves, J. Atmos. Sol.-Terr. Phy., 62, 1689–1718,, 2000. a
Short summary
The transient electromagnetic method (TEM) is widely used for mapping subsurface resistivity structures, but data are inevitably contaminated by noise from various sources including radio signals in the very low frequency (VLF) 3–30 kHz band. We present an approach where VLF noise is effectively suppressed with a new post-processing scheme where boxcar gates are combined into semi-tapered gates. The result is a 20 % increase in the depth of investigation for the presented test survey.