A comparison of helicopter-borne electromagnetic systems for hydrogeologic studies

Paul A. Bedrosian, Cyril Schamper, Esben Auken

Publikation: Bidrag til tidsskriftArtikelForskningpeer review

16 Citationer (Scopus)


The increased application of airborne electromagnetic surveys to hydrogeological studies is driving a demand for data that can consistently be inverted for accurate subsurface resistivity structure from the near surface to depths of several hundred metres. We present an evaluation of three commercial airborne electromagnetic systems over two test blocks in western Nebraska, USA. The selected test blocks are representative of shallow and deep alluvial aquifer systems with low groundwater salinity and an electrically conductive base of aquifer. The aquifer units show significant lithologic heterogeneity and include both modern and ancient river systems. We compared the various data sets to one another and inverted resistivity models to borehole lithology and to ground geophysical models. We find distinct differences among the airborne electromagnetic systems as regards the spatial resolution of models, the depth of investigation, and the ability to recover near-surface resistivity variations. We further identify systematic biases in some data sets, which we attribute to incomplete or inexact calibration or compensation procedures.

Sider (fra-til)192-215
Antal sider24
TidsskriftGeophysical Prospecting
Udgave nummer1
StatusUdgivet - 1 jan. 2016
Udgivet eksterntJa


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