Airborne Geophysical Solutions for Geotechnical Challenges

Helicopter time-domain electromagnetics can be of substantial value to pre-engineering and construction projects. This White Paper presents several real world examples of how and where SkyTEM data was used to quickly and economically create or revise geological models and reduce risk on geotechnical engineering projects.

Download more papers on airborne geophysical surveying for geotechnical purposes here.

SkyTEM for Geotechnical Engineering

Geotechnical Engineering by SkyTEMRead two papers regarding SkyTEM used for geotechnical Engineering.

Correlating ERT with AEM in a rock slide mapping project

Presented at ASEG-PESA in 2013 by NGI and RockSense Geosolutions.

They investigate an active rock slide in Western Norway with ground- and airborne resistivity mapping to ultimately find weakness zones and sliding planes embedded in crystalline bedrock. Based on a successful airborne electromagnetic (AEM) demonstration survey they conducted a total of 1,600 profile meteres of ground resisitivy Measurements to confirm AEM anomalies, to gain precise 2D geometries and to link conductivity anomalies with geology.

Quantitative Depth to Bedrock Extraction from AEM Data

Presented at Near Surface Geoscience in 2014 by NGI and Queen’s University.

A new road segment is being planned northeast of Norway’s Capital city, Oslo. In this context, knowledge of sediment thickness is vital, as is information about occurrence and extent of highly sensitive marine clay (so-called quick clay).

Airborne EM Measurements were donducted to provide information of depth to bedrock/sediment thickness between drilling sites and guide the further drilling program. AEM data indicate a variable bedrock depth with a general trend towards shallower bedrock in the northeastern part of the investigation area. Quick clay is not easily identified in the AEM data, but some possible occurrence agree well with the results form the drillings.