Geotechnical Section
National Geotechnical Borehole Database

The GSI has been making efforts to input all available site investigation reports, borehole and trial pit records to the national geotechnical borehole database, both for the Geotechnical viewer and the GeoUrban project. The Geotechnical viewer includes all the investigations held for the whole country. Soil types and Depth to Bedrock (DTB) data is frequently recorded which contributes to revised quaternary mapping. Depth to Bedrock and Rockhead maps are updated when new data is available.

These maps are available to view and query on the
GeoUrban Viewer.

There are also Depth to Bedrock and Rockhead maps from other towns (Galway, Limerick and Waterford).

Rockhead map of Waterford   Rockhead map of Waterford
 Rockhead map of Dublin  Rockhead map of Dublin


GSI3D is a software tool that allows you to create 3D solid models of the Quaternary and Bedrock geology as part of the Geourban project.

The Geotechnical section has been concentrating on the input and modelling of borehole data in Dublin and Cork city.

A 3D model of the Quaternary of Dublin and Cork city has being constructed using this software.

3D model of the Quaternary in Dublin City
 3D model of the Quaternary in Cork City

Borehole records are selected from the National Geotechnical Borehole Database for a specific area. The geology is interpreted for each borehole using information contained in the logs and quaternary (unconsolidated sediments) maps of the area. This data is inputted into GSI3D after editing it.

A cross section diagram fence is created by correlating boreholes and outcrop data. Those cross sections and boreholes together with a DEM allow the software to “fill the gaps” between the sections to create the 3D model.

 Exploded 3D model of the Quaternary in Cork City
The image depicts the Quaternary sediments in Dublin and Cork city. The colours represent the different lithologies interpreted from the borehole logs/quaternary mapping (glacial tills, gravels, alluvium etc).

Boreholes can also be represented in 2D.


 EW Cross-section in Dublin Port
As more data is added these models can be updated and run as many times as we want.

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