Crown Estate Releases BGS Geological Assessment of Irish Sea

The Crown Estate has published a study by the British Geological Survey (BGS) summarising the geological conditions of the Irish Sea, thus providing a valuable resource for the development of offshore infrastructure in the region.

Image: The Crown Estate

The study follows the Crown Estate’s publication of a wide range of data collected for the discontinued Celtic Array offshore wind farm, such as geotechnical and geophysical data, as well as sediment sampling. BGS undertook a detailed assessment of the Irish Sea, combining the Celtic Array data with the best available data from other sources, such as BGS legacy data, regional reports and site investigations by other industries.

The assessment is intended to provide an introduction to developers interested in the region to help inform broad decisions as to ground suitability, highlighting a range of geological factors to be considered in development activity located at a depth of between 0 and 50m of seabed.

Keith Westhead, Principal Marine Geologist at the British Geological Survey, said: “This collaboration with The Crown Estate is an excellent example of how our regional assessments of the seabed can be greatly improved through use of newly available high-resolution site investigation data. We were also able to work with researchers at Bangor and Liverpool universities, who had previously examined the Irish Sea data, to build on our existing knowledge and data to provide this enhanced geological assessment. We aim through such approaches to increase the application of geoscience to support offshore development and research across the UK Continental Shelf area.”

The study area incorporates areas of the seabed extending up to the coastline within the UK and Isle of Man waters. The assessment considered nearly 23,500 km² and summarises topography, sediments and processes; the Quaternary history and its impacts; and a review of bedrock distribution and properties.

The report will be hosted on the Marine Data Exchange, which also provides access to wider environmental survey data and reports collated during the planning, building and operation of offshore renewable energy projects.

It will also be made available through the NERC Open Research Archive (NORA).