c563569e-0875-404b-acb2-cd5f9e5c4706 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 2018-09-20 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 Multi-azimuth long-offset seismic gathers from Korff Ice Rise, West Antarctica, 2015 2018-09-20 creation 2018-09-20 revision 2018-09-20 publication 2018-09-20 released 1.0 https://doi.org/10.5285/c563569e-0875-404b-acb2-cd5f9e5c4706 doi GB/NERC/BAS/PDC/01099 https://data.bas.ac.uk/ Please cite this item as: Brisbourne, A., & Smith, A. (2018). Multi-azimuth long-offset seismic gathers from Korff Ice Rise, West Antarctica, 2015 (Version 1.0) [Data set]. Polar Data Centre, Natural Environment Research Council, UK Research & Innovation. https://doi.org/10.5285/c563569e-0875-404b-acb2-cd5f9e5c4706 In 2015 long offset seismic gathers were collected at Korff Ice Rise, West Antarctica, with the aim of studying fabric within the ice column and ice bed properties. Data were collected at sites within 700m of one another along the axis of the ice divide. The seismic gathers were collected at 60 deg intervals to study azimuthal variation in seismic velocity and shear wave splitting. This study is part of the British Antarctic Survey programme Polar Science for Planet Earth. All data were collected with the support of the British Antarctic Survey. No credit. completed Brisbourne, Alex British Antarctic Survey, Natural Environment Research Council, UK Research & Innovation Researcher author Smith, Andy British Antarctic Survey, Natural Environment Research Council, UK Research & Innovation 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 Facies EARTH SCIENCE > Cryosphere > Glaciers/Ice Sheets > Ice Sheets EARTH SCIENCE > Hydrosphere > Glaciers/Ice Sheets > Glacier Facies EARTH SCIENCE > Hydrosphere > Glaciers/Ice Sheets > Ice Sheets EARTH SCIENCE > Cryosphere > Glaciers/Ice Sheets EARTH SCIENCE > Hydrosphere > Glaciers/Ice Sheets 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 Anisotropy Fabric Polarimetry Seismic theme Korff Ice Rise Antarctica place Elevation Hydrography 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 This data is governed by the NERC Data Policy: https://www.ukri.org/who-we-are/nerc/our-policies-and-standards/nerc-data-policy/ otherRestrictions This data is governed by the NERC data policy and supplied under Open Government Licence v.3 otherRestrictions No restrictions apply. url url crossReference textTable eng utf8 geoscientificInformation -68.414 -68.414 -78.714 -78.714 2015-01-01 2015-01-31 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 bytes 51380224 https://ramadda.data.bas.ac.uk/repository/entry/show?entryid=c563569e-0875-404b-acb2-cd5f9e5c4706 WWW:LINK-1.0-http--link Get Data Download data download dataset Methodology: The three gathers were oriented at 60° to one another to constrain azimuthal variation in seismic properties centred on a single site on the axis of the divide. Each gather used four shot points, each with 48 receivers at 10m intervals. The offset to the first receiver ranged from 30 to 1440m, producing traces out to 1940m offset, or incidence angle at the bed up to 58°. To achieve three-component recordings, the receivers were oriented to measure either vertical, radial or transverse motion. The CMP gather along the divide axis (K01; true bearing 043°) was shot twice: once with all sensors orientated vertically using 150g of high explosive, and once with horizontal sensors alternating radial and transverse orientation, using 600g shots; the latter resulting in an effective 20m receiver interval for the horizontal components. The oblique CMP gathers (K02: 60° east of K01; K03: 60° west of K01) were shot once only, each with 600g shots and alternating vertical, radial and transverse receivers, resulting in an effective 30m receiver interval for all three components. The larger shot is required to generate sufficient S-wave energy at the source. Although an explosive source in a homogeneous isotropic medium will theoretically not generate S-wave energy, the non-uniform nature of the shallow firn results in significant S-wave energy. The acquisition geometry results in a mid-point basal reflection ellipse with a length of 235m. Data collection: Instrumentation: Recorded on 2 x 24 channel Geometrics Geode with 48 x 40Hz Georods; Source: 150-600g high explosive shots at 20 m depth. Resolution: The Fresnel zone is less than 80 m (minimum 150 Hz dominant frequency). 1940m maximum offset. Data quality: 8000Hz sample rate with GPS shot trigger timing; 24 bit recording asNeeded completed