The National Seismological Archive (NSA) is the United Kingdom national repository for seismological material. It was created principally to preserve data from seismological observatories in the UK that have now closed. In many cases in the past records have been lost or destroyed when there is no longer anyone to look after them; the NSA provides a permanent home for these historical scientific documents, to preserve them for posterity. The principal collection consists of the seismograms stores from defunct observatories; also bulletins and reports from all over the world dating from the 1890s onwards, held in a variety of media, including earthquake-related newspaper cuttings, glass slides, microfilm, and comprehensive UK earthquake research material collected over a 30 year period. One of the major projects of the archive has been the presentation of current knowledge of UK historical earthquake seismology material in a short series of reports, easily accessible to researchers. Data includes: Bulletins and correspondence from historical UK observatories; The Ambraseys collection of papers and notes concerning world seismicity; Reports and bulletins from the BGS seismology group; Collected documents concerning seismographs and UK earthquakes; Paper felt report forms distributed and collected by the BGS for earthquakes from the early 1980s until web based forms replaced them.

Observed global seismograms used to study earthquakes in the Azores. The seismograms have been processed and then have been used to perform source inversions of the events.

This dataset contains recorded earthquakes in the UK from 1970 onwards. The catalogue covers the offshore areas as well as mainland UK, covering an area between 10 degrees West to 4 degrees East and 49 degrees to 62 degrees North. This includes all of Ireland and some earthquakes in northern France that were also felt in the UK. Accuracies of magnitude, location, and origin time vary with the instrumental measurements. Variations are largely a function of the seismograph station coverage, which has been improving up to the present day.

During the interpretation of the geological structure of the Sellafield site, a series of 3-D models were created using EarthVision and Vulcan software. These models have been imported into the computer systems operated by British Geological Survey. Geological investigations of the Sellafield and Dounreay areas were undertaken between 1989 and 1997 as part of its programme to determine whether one of the areas might be a suitable location of a deep repository for the disposal of radioactive waste. The Nirex (Nuclear Industry Radioactive Waste Executive) Geological Archive was deposited with BGS in 2000 and BGS have undertaken to retain the records for a minimum of 50 years as part of its national geological archive. The archive has been moved to permanent storage locations and normal BGS arrangements will apply for non-commercial (academic) access to the material. The ownership of NIREX (Nuclear Industry Radioactive Waste Executive) was transferred from the nuclear industry to the UK Government departments DEFRA and DTI in April 2005, and then to the UK's Nuclear Decommissioning Authority (NDA) in November 2006.

The paper archives comprise a set of the factual and interpretative reports that document the investigations carried out by Nirex (Nuclear Industry Radioactive Waste Executive) and its contractors. In total there are in excess of 2,250 individual volumes. It is the availability of this paper archive of results and interpretation that makes the Nirex geological archives of rock cores and samples unique. The ownership of NIREX (Nuclear Industry Radioactive Waste Executive) was transferred from the nuclear industry to the UK Government departments DEFRA and DTI in April 2005, and then to the UK's Nuclear Decommissioning Authority (NDA) in November 2006.

A significant part of this data collection is geophysical survey data in digital form, being mainly instrumental recordings made during fieldwork. Derived data created during the subsequent processing and interpretation of the field data is described in 'Nirex Magnetic Tape Archives - Processed Data'. These data were originally stored on a variety of media. With the overall aim of delivering an efficient and effective archive service, the data have been consolidated onto DLT cartridges. Some related data, which were either analogue, on obscure media or in unknown formats have been retained in their original form. British Geological Survey maintains a full catalogue of the data, as an Access database.The data sets that comprise the magnetic archive are the following: Seismic surveys: marine, land and transition zone; field, navigation, statiatcs; Geophysical wireline logging of boreholes: routine wireline logging of investigation boreholes (gamma-ray, sonic, porosity, etc.); velocity surveys; dipmeter surveys;vertical seismic profiling; borehole televiewer (BHTV) surveys; formation microscanner (FMS) surveys; Ground surveys: magnetic; gravity; radiometric; thermal imaging; photographic imaging; in-flight videos. The ownership of NIREX (Nuclear Industry Radioactive Waste Executive) was transferred from the nuclear industry to the UK Government departments DEFRA and DTI in April 2005, and then to the UK's Nuclear Decommissioning Authority (NDA) in November 2006.

A significant part of this data collection is geophysical survey data in digital form being derived data created during the subsequent processing and interpretation of the field data described in 'Nirex Magnetic Tape Archives - Raw Data'. These data were originally stored on a variety of media. With the overall aim of delivering an efficient and effective archive service, the data have been consolidated onto DLT cartridges. Some related data, which were either analogue, on obscure media or in unknown formats have been retained in their original form. British Geological Survey maintains a full catalogue of the data, as an Access database. The data sets that comprise the magnetic archive are the following: Seismic surveys: demultiplexed and processed data; Geophysical wireline logging of boreholes: wireline derived data including synthetic seismograms; cross-hole tomography. The ownership of NIREX (Nuclear Industry Radioactive Waste Executive) was transferred from the nuclear industry to the UK Government departments DEFRA and DTI in April 2005, and then to the UK's Nuclear Decommissioning Authority (NDA) in November 2006.