Articles | Volume 10, issue 1
Geosci. Instrum. Method. Data Syst., 10, 81–90, 2021
https://doi.org/10.5194/gi-10-81-2021
Geosci. Instrum. Method. Data Syst., 10, 81–90, 2021
https://doi.org/10.5194/gi-10-81-2021

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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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.