f7eda2dc-245e-4704-aef8-4a267190c22a eng utf8 dataset dataset NERC EDS UK Polar Data Centre +44 (0)1223 221400 British Antarctic Survey, High Cross, Madingley Road Cambridge Cambridgeshire CB3 0ET United Kingdom polardatacentre@bas.ac.uk https://www.bas.ac.uk/team/business-teams/information-services/uk-polar-data-centre/ information pointOfContact 2025-10-10 ISO 19115 Geographic Information - Metadata ISO 19115:2003(E) European Petroleum Survey Group (EPSG) Geodetic Parameter Registry 2008-11-12 publication European Petroleum Survey Group EPSGadministrator@iogp.org https://www.epsg-registry.org/ EPSG Geodetic Parameter Dataset The EPSG Geodetic Parameter Dataset is a structured dataset of Coordinate Reference Systems and Coordinate Transformations, accessible through this online registry. information publisher urn:ogc:def:crs:EPSG::3031 6.18.3 Subglacial Lake Ellsworth seismic reflection profiles, raw seismic and GPS survey data, 2007/2008 2025-10-10 creation 2025-10-10 revision 2025-10-10 publication 2025-10-10 released 1.0 https://doi.org/10.5285/f7eda2dc-245e-4704-aef8-4a267190c22a doi GB/NERC/BAS/PDC/02091 https://data.bas.ac.uk/ NE/D009200/1 award NE/D008638/1 award NE/D008751/1 award Please cite this item as: Smith, A., Brisbourne, A., Woodward, J., Ross, N., & Siegert, M. (2025). Subglacial Lake Ellsworth seismic reflection profiles, raw seismic and GPS survey data, 2007/2008 (Version 1.0) [Data set]. NERC EDS UK Polar Data Centre. https://doi.org/10.5285/f7eda2dc-245e-4704-aef8-4a267190c22a Five seismic reflection profiles (Lake A to E) were acquired across Subglacial Lake Ellsworth (SLE), Antarctica, during the 2007-08 austral summer. SLE is a freshwater lake that lies under ice that is ~3.2 km thick. SLE is approximately 15 km long and 3 km wide. The data were acquired to determine the overlying ice thickness, the water depth in the lake, and the lake-bed material. The seismic lines were aligned perpendicular to the lake's long axis and spaced roughly 1.4 km apart, over what appears to be the deeper part of the lake. Seismic shot-point locations were determined using RTK GPS methods. Seismic sources were Pentolite explosives in 30 m deep holes made with a hot-water drill and backfilled with snow. The fieldwork was a collaboration between the British Antarctic Survey (BAS), Northumbria University and the University of Edinburgh. Funding was provided by NERC AFI awards NE/D009200/1, NE/D008638/1 and NE/D008751/1. Equipment support by NERC Geophysical Equipment Facility loan numbers 838 and 870. No credit. completed Smith, Andrew British Antarctic Survey Researcher author Brisbourne, Alex British Antarctic Survey Researcher author Woodward, John Northumbria University Researcher author Ross, Neil Newcastle University Researcher author Siegert, Martin University of Exeter Researcher author NERC EDS UK Polar Data Centre +44 (0)1223 221400 British Antarctic Survey, High Cross, Madingley Road Cambridge Cambridgeshire CB3 0ET United Kingdom PDCServiceDesk@bas.ac.uk https://www.bas.ac.uk/team/business-teams/information-services/uk-polar-data-centre/ information pointOfContact asNeeded completed EARTH SCIENCE > Cryosphere > Glaciers/Ice Sheets > Glacier Thickness/Ice Sheet Thickness EARTH SCIENCE > Cryosphere > Glaciers/Ice Sheets > Glaciers EARTH SCIENCE > Solid Earth > Seismology > Seismic Profile theme Global Change Master Directory (GCMD) Science Keywords 2026-01-27 publication 23 Global Change Data Center, Science and Exploration Directorate, Goddard Space Flight Center (GSFC) National Aeronautics and Space Administration (NASA) Greenbelt MD United States of America https://earthdata.nasa.gov/about/gcmd/global-change-master-directory-gcmd-keywords Global Change Master Directory (GCMD) Keywords The information provided on this page seeks to define how the GCMD Keywords are structured, used and accessed. It also provides information on how users can participate in the further development of the keywords. information publisher West Antarctic Ice Sheet bathymetry seismology subglacial lake theme Subglacial Lake Ellsworth Antarctica place Elevation Geology theme GEMET - INSPIRE themes, version 1.0 2021-01-06 revision otherRestrictions no limitations to public access otherRestrictions no limitations license Open Government Licence v3.0 otherRestrictions Data supplied under Open Government Licence v3.0 otherRestrictions No restrictions apply. url url crossReference url url largerWorkCitation url url largerWorkCitation url url largerWorkCitation url url largerWorkCitation doi doi crossReference doi doi crossReference doi doi crossReference textTable eng utf8 elevation inlandWaters -91.0 -90.0 -79.1 -78.9 2007-12-02 2008-01-31 1900.0 1920.0 urn:ogc:def:crs:EPSG::5714 MSL height Not specific to any location or epoch. Hydrography. It is recommended that careful attention be paid to the contents of any data, and that the author be contacted with any questions regarding appropriate use. If you find any errors or omissions, please report them to polardatacentre@bas.ac.uk. NERC EDS UK Polar Data Centre +44 (0)1223 221400 British Antarctic Survey, High Cross, Madingley Road Cambridge Cambridgeshire CB3 0ET United Kingdom PDCServiceDesk@bas.ac.uk https://www.bas.ac.uk/team/business-teams/information-services/uk-polar-data-centre/ information distributor text/plain text/csv bytes 323800269 http://ramadda.data.bas.ac.uk/repository/entry/show?entryid=f7eda2dc-245e-4704-aef8-4a267190c22a WWW:LINK-1.0-http--link Get Data Download data download bytes 323800269 http://ramadda.data.bas.ac.uk/repository/entry/show?entryid=f7eda2dc-245e-4704-aef8-4a267190c22a WWW:LINK-1.0-http--link Get Data Download data download dataset Methodology: Shot-point location was determined using RTK GPS methods. Receivers used were Leica 530. One receiver operated as a base station, located in the middle of each survey area. The other receiver was operated as a real-time rover. Seismic source for each shot was 450 g of Pentolite explosive buried at 30 m depth in holes made by a hot-water drill. Data acquisition used a spread of 48 geophones (40 Hz natural frequency) spaced at 10 m intervals with an offset from shot to first geophone of 30 m. Shot-spacing and move-up per shot was 240 m, giving single fold coverage. Line length varied between 33 and 12 shots. The data provided comprise sorted raw shot gathers. Raw field data for each line were sorted into sequential traces and written to a single SEG-Y file. The metadata provided contain the GPS-derived position of each shot point (latitude (decimal degrees), longitude (decimal degrees), elevation (m relative to WGS-84 ellipsoid). Seismic data were processed with Halliburton-Landmark ProMAX software under academic license to BAS. Horizontal and vertical position of each shot point is given. These were determined using dual-frequency GPS surveying with a precision of approximately 10 cm. Vertical precision is given by the sample interval of 0.2 ms. Note this is given in time, not depth; no depth conversion has been applied. Data collection: Seismic data were acquired using OYO 40 Hz single geophones and Geometrics GEODE 48-channel seismic data logger recording in SEG-2 format. Data were logged at 4 kHz; record length was 4 s. Data processing (sorting and writing to SEG-Y format) done using ProMax seismic processing software. Data quality: SEG-Y data include relative geometry in the headers with a shot point interval of 240 m and a receiver interval of 10 m. Only shot locations were surveyed to provide accurate location and elevation. Receiver locations must be determined by interpolation and extrapolation using the shot point profiles. asNeeded completed