New map shows electromagnetic fields in Laois

Geological Survey Ireland (GSI) has published three new maps of County Laois, showing the 'county colours' from a new perspective.

These maps show the geophysical data of Laois, showing the magnetic, electromagnetic and radiometric levels around the county.

Since 2011, the Tellus programme of Geological Survey Ireland — a division of the Department of the Environment, Climate, and Communications — has been collecting geophysical data via onboard instruments on low-flying aircraft.

Pictured: Electromagnetic levels in Laois

“Geologists and geophysicists have a different way of looking at things, both in terms of time and space," said Koen Verbruggen, Director of Geological Survey Ireland.

"They use colour to represent different properties of rock or millions of years in time. People may remember the aircraft flying low above their homes and might have wondered was there anything unusual found in their county.

Pictured: Radiometric levels in Laois

The radiometrics map highlights County Laois’ sandstone derived soils of the Slieve Blooms, which appear red. The black areas on the same map represent peat. In the electromagnetic map, the blue area north of Spink correspond to the siltstones and mudstones of the Castlecomer plateau.

Airborne geophysics is a cost-effective means of detecting the physical properties of soil, rock, and water beneath the ground. The data can be used for various purposes, for example, geological mapping, mineral exploration, radon risk mapping, and geothermal energy exploration through the understanding of the subsurface.

Pictured: Magnetic levels in Laois

The Tellus survey is a national programme designed to gather geochemical and geophysical data across Ireland, in other words, to examine the chemical and physical properties of our soil, rocks, and water. Tellus is undertaken by Geological Survey Ireland and is funded by the Department of the Environment, Climate, and Communications.

The Tellus maps of County Laois are available here.