Electrical Resistivity Tomography to follow up an airborne EM rock slide mapping survey – Linking rock quality with resistivity

Pfaffhuber, Andreas Aspmo; Bazin, Sara; Domaas, Ulrik; Grimstad, E.

doi:10.1190/sbgf2011-042

Cited by 2 publications

(2 citation statements)

References 5 publications

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“…The first AEM survey undertaken by the Norwegian Geotechnical Institute (NGI) occurred in 2009 to investigate an active rockslide in Western Norway with the ground and airborne resistivity mapping [24]. In the following years, several AEM surveys were conducted for other geotechnical applications, usually connected to large, linear infrastructure projects (i.e., highways, railways, and tunnels).…”

Section: Norwegian Geotechnical Institute and Emerald Geomodelling Surveysmentioning

confidence: 99%

AEM in Norway: A Review of the Coverage, Applications and the State of Technology

Harrison¹,

Baranwal

Pfaffhuber³

et al. 2021

Remote Sensing

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From the first use of airborne electromagnetic (AEM) systems for remote sensing in the 1950s, AEM data acquisition, processing and inversion technology have rapidly developed. Once used extensively for mineral exploration in its early days, the technology is increasingly being applied in other industries alongside ground-based investigation techniques. This paper reviews the application of onshore AEM in Norway over the past decades. Norway’s rugged terrain and complex post-glacial sedimentary geology have contributed to the later adoption of AEM for widespread mapping compared to neighbouring Nordic countries. We illustrate AEM’s utility by using two detailed case studies, including time-domain and frequency domain AEM. In both cases, we combine AEM with other geophysical, geological and geotechnical drillings to enhance interpretation, including machine learning methods. The end results included bedrock surfaces predicted with an accuracy of 25% of depth, identification of hazardous quick clay deposits, and sedimentary basin mapping. These case studies illustrate that although today’s AEM systems do not have the resolution required for late-phase, detailed engineering design, AEM is a valuable tool for early-phase site investigations. Intrusive, ground-based methods are slower and more expensive, but when they are used to complement the weaknesses of AEM data, site investigations can become more efficient. With new developments of drone-borne (UAV) systems and increasing investment in AEM surveys, we see the potential for continued global adoption of this technology.

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Section: Norwegian Geotechnical Institute and Emerald Geomodelling Surveysmentioning

confidence: 99%

AEM in Norway: A Review of the Coverage, Applications and the State of Technology

Harrison¹,

Baranwal

Pfaffhuber³

et al. 2021

Remote Sensing

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show abstract

“…Wynn (2006) carries out airborne TEM survey for aquifer delineation up to a depth of 400 m in Upper San Pedro River basin, Cochise County, South Eastern Arizona using aircraft at a nominal terrain-clearance of 120 m. Now, HTEM with terrainclearance of 30 m have been developed. Pfaffhuber et al (2010Pfaffhuber et al ( , 2011 use it for mapping clays associated with tunneling hazards and active rock slides in western Norway. The information obtained from HTEM can be used for further detailing on the ground wherever required.…”

Section: Airborne Electromagnetic Surveysmentioning

confidence: 99%

The time domain electromagnetic method

Chandra¹

2015

Groundwater Geophysics in Hard Rock

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Electrical Resistivity Tomography to follow up an airborne EM rock slide mapping survey – Linking rock quality with resistivity

Cited by 2 publications

References 5 publications

AEM in Norway: A Review of the Coverage, Applications and the State of Technology

AEM in Norway: A Review of the Coverage, Applications and the State of Technology

The time domain electromagnetic method

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