Geophysical data index Geological survey Ireland

Sub-bottom profile data shows the rock features and the sediment layers that are below the seabed.A sub bottom profile is created by sending sound or seismic waves from a boat to the seabed. The length of time it takes for these waves to return from the seabed to the boat is measured. The length of time tells us how hard the material below the seabed is. Hard material such as solid rock returns the sound wave very quickly. Soft material such as mud returns the sound wave very slowly. This allows us to build a picture of the subsurface structure and geology beneath the seabed.This map shows all shows where sub bottom profile data has been collected from the seabed in Irish waters. This data was collected from 1996 to the present date.It is a vector dataset. Vector data portray the world using points, lines, and polygons (areas).The Sub-bottom profile lines show the route of the boat as it collected Sub-bottom profile (SBP) data.