8cdf7941-f13b-4237-b921-05a6c6cde40a 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 2020-06-29 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 Geophysical survey of Peninsula Point, NWT, Canada, using Tromino 3G ENGY instruments, 2019-07-31 - 2019-08-03 2020-06-29 creation 2020-06-29 revision 2020-06-29 publication 2020-06-29 released 1.0 https://doi.org/10.5285/8cdf7941-f13b-4237-b921-05a6c6cde40a doi GB/NERC/BAS/PDC/01351 https://data.bas.ac.uk/ Please cite this item as: Lim, M., & Martin, J. (2020). Geophysical survey of Peninsula Point, NWT, Canada, using Tromino 3G ENGY instruments, 2019-07-31 - 2019-08-03 (Version 1.0) [Data set]. UK Polar Data Centre, Natural Environment Research Council, UK Research & Innovation. https://doi.org/10.5285/8cdf7941-f13b-4237-b921-05a6c6cde40a This is a survey over the changing topography of a massive ice type site, Peninsula Point (UTM 8N 573400, 7701000), within the Canadian National Landmark, NWT, Canada. These data can be used as a reference for future such studies to assess massive ground ice presence. This dataset contains the survey data from Tromino 3G ENGY instruments, collected from 2019-07-31 - 2019-08-03. The project files contain the metadata of each instrument position in UTM and acquisition times. Data were collected by Northumbria University and Natural Resources Canada. Funding was provided by NERC Arctic Office. No credit. completed Lim, Michael Northumbria University Researcher author Martin, James Northumbria University 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 > Frozen Ground > Permafrost EARTH SCIENCE > Cryosphere > Snow/Ice > Permafrost EARTH SCIENCE > Land Surface > Frozen Ground > Permafrost EARTH SCIENCE > Solid Earth > Seismology > Seismic Surface Waves 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 Geophysical Survey Massive Ice Passive Seismic Permafrost theme Peninsula Point, Northwest Territories, Canada Arctic place Meteorological geographical features Land cover 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 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 These data are governed by the NERC data policy and supplied under Open Government Licence v3.0 otherRestrictions No restrictions apply. url url crossReference textTable eng utf8 elevation environment geoscientificInformation -133.1367 -133.1232 69.40683 69.40956 2019-07-31 2019-08-03 0.0 12.0 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 image/tiff image/png bytes 223870976 https://ramadda.data.bas.ac.uk/repository/entry/show?entryid=8cdf7941-f13b-4237-b921-05a6c6cde40a WWW:LINK-1.0-http--link Get Data Download data download bytes 223870976 https://ramadda.data.bas.ac.uk/repository/entry/show?entryid=8cdf7941-f13b-4237-b921-05a6c6cde40a WWW:LINK-1.0-http--link Get Data Download data download bytes 223870976 https://ramadda.data.bas.ac.uk/repository/entry/show?entryid=8cdf7941-f13b-4237-b921-05a6c6cde40a WWW:LINK-1.0-http--link Get Data Download data download bytes 223870976 https://ramadda.data.bas.ac.uk/repository/entry/show?entryid=8cdf7941-f13b-4237-b921-05a6c6cde40a WWW:LINK-1.0-http--link Get Data Download data download dataset Methodology: Passive seismic surveys have been conducted in order to map and characterize the spatial distribution of subsurface layers across the site at Peninsula Point. Three-dimensional wave signals within the earths sub-surface propagate through the near surface layers and notable differences between amplitudes of horizontal and vertical motions are caused by acoustic impedance contrasts at layer boundaries. The spectral ratio of horizontal over vertical responses exhibit resonance frequencies (fr) that can be directly linked to the layer thickness (h). The layer thicknesses are estimated by the quarter wavelength resonance approximation. Measurements of visible contact layer depths exposed in permafrost cliff sections adjacent to a set of control reading locations have been used to characterize relative acoustic impedance contrast signatures and to calculate shear wave velocity (Vs) through each of the main material layers (see supporting information). This has enabled the determination of two distinct high frequency signal peaks associated with specific ground layer controls. A single peak in the resonance frequency (usually around 20 Hz) denoted active layer or slurry contact directly onto massive ice, whereas traces with a high frequency peak around 30 - 50 Hz (usually with additional lower frequency peaks of 1 - 5 Hz) represented a permafrost to ice contact. Sub-divisions were also identified: Group 1 = single distinct peak representing a shallow contact directly on to ice (no lower frequency acoustic impedance contrast); Group 2 = large peak then a secondary lower peak that corresponds with the permafrost-ice contact and then the base of the massive ice (from boreholes we know this to mostly a sand layer) respectively; Group 3 = a muted high frequency peak that then curves up to a low frequency base line; Group 4 = two comparable peaks, which may indicate a lower contrast in the impedance so potentially frozen sand layers, although there is no validation for this interpretation. Once the impedance contrast signatures were classified, the following formula was applied to calculate and validate layer boundary depths (h): h = Vs / 4fr A shear-wave velocity of 920 ms-1 for the permafrost was determined from cliff outcrop data at the site and was used to derive depth to the massive ice contact. Validation sites have also been used to make sure that layer properties were sufficiently consistent over the survey area (see supporting information) and active layer probe depths have been used to map ice surface where it rose to very near the ground surface (and hence no permafrost was present). The 2018 massive ground ice surface has been interpolated to form a massive ice surface relative to sea-level (Ice_Surface.tif). Data collection: Tromino® 3G ENGY instruments have been used to record three component accelerometer measurements of ambient noise and have been processed in Grilla Software. Data quality: Surface to ice surface measurements from exposed ice cliffs have been used to calibrate and validate the shear wave velocities used to derive surface boundaries. asNeeded completed