A temporal and spatial analysis of anthropogenic noise sources affecting SNMR

E. Dalgaard, P. Christiansen, J. J. Larsen, E. Auken

Publikation: Bidrag til tidsskriftArtikelForskningpeer review

18 Citationer (Scopus)


One of the biggest challenges when using the surface nuclear magnetic resonance (SNMR) method in urban areas is a relatively low signal level compared to a high level of background noise. To understand the temporal and spatial behavior of anthropogenic noise sources like powerlines and electric fences, we have developed a multichannel instrument, noiseCollector (nC), which measures the full noise spectrum up to 10kHz. Combined with advanced signal processing we can interpret the noise as seen by a SNMR instrument and also obtain insight into the more fundamental behavior of the noise. To obtain a specified acceptable noise level for a SNMR sounding the stack size can be determined by quantifying the different noise sources. Two common noise sources, electromagnetic fields stemming from powerlines and fences are analyzed and show a 1/r2 dependency in agreement with theoretical relations. A typical noise map, obtained with the nC instrument prior to a SNMR field campaign, clearly shows the location of noise sources, and thus we can efficiently determine the optimal location for the SNMR sounding from a noise perspective.

Sider (fra-til)34-42
Antal sider9
TidsskriftJournal of Applied Geophysics
StatusUdgivet - 1 nov. 2014
Udgivet eksterntJa


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