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Seismic refraction data from two sites on Antarctica's Larsen C Ice Shelf, Nov 2017, following the calving of Iceberg A68
Seismic refraction data were acquired at two sites on Antarctica's Larsen C Ice Shelf, in November 2017. The acquisition was performed to measure seismic anisotropy, a proxy for the stress condition, in the ice shelf following the calving of Iceberg A68 in July 2017. 2D seismic profiles were acquired at two sites: S1, close to the new calving front of the ice shelf, and S2, advected downstream from the site surveyed in the NERC funded project NE/E013414/1 (SOLIS). Profiles were rotated about a common midpoint to examine the variation in seismic properties with azimuth. Throughout, 24 geophones were deployed at 10 m offset, with data recorded at a Geometrics GEODE system; data are presented here in SEG-2 format. All acquisitions were performed by Dr Jim White (British Geological Survey) and Emma Pearce (University of Leeds, School of Earth and Environment), with support from BAS.
The data is part of the NERC RACE project, NE/R012334/1.
Simple
- Date (Creation)
- 2019-08-14
- Date (Revision)
- 2019-08-14
- Date (Publication)
- 2019-08-14
- Date (released)
- 2019-08-14
- Edition
-
1.0
- Unique resource identifier
- https://doi.org/10.5285/147baf64-b9af-4a97-8091-26aec0d3c0bb
- Codespace
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doi
- Unique resource identifier
- GB/NERC/BAS/PDC/01226
- Codespace
- Unique resource identifier
- NE/E013414/1
- Codespace
-
award
- Unique resource identifier
- NE/R012334/1
- Codespace
-
award
- Other citation details
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Please cite this item as: Booth, A., White, J., Pearce, E., Cornford, S., Brisbourne, A., Luckman, A., & Kulessa, B. (2019). Seismic refraction data from two sites on Antarctica's Larsen C Ice Shelf, Nov 2017, following the calving of Iceberg A68 (Version 1.0) [Data set]. UK Polar Data Centre, Natural Environment Research Council, UK Research & Innovation. https://doi.org/10.5285/147baf64-b9af-4a97-8091-26aec0d3c0bb
- Credit
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No credit.
- Status
- Completed
- Point of contact
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Organisation name Individual name Electronic mail address Role University of Leeds
Booth, Adam Author British Geological Survey
White, Jim
Author University of Leeds
Pearce, Emma
Author Swansea University
Cornford, Stephen Author British Antarctic Survey Brisbourne, Alex Author Swansea University
Luckman, Adrian Author Swansea University
Kulessa, Bernd Author NERC EDS UK Polar Data Centre Point of contact
- Maintenance and update frequency
- As needed
- Maintenance note
- Completed
- Theme
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Larsen
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anisotropy
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calving
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ice shelf
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seismic refraction
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- Place
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Larsen C Ice Shelf, Antarctic Peninsula Antarctica
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GEMET - INSPIRE themes, version 1.0
- Access constraints
- Other restrictions
- Other constraints
- no limitations to public access
- Access constraints
- Other restrictions
- Other constraints
- no limitations
- Use constraints
- License
- Other constraints
- Open Government Licence v3.0
- Use constraints
- Other restrictions
- Other constraints
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This data is governed by the NERC Data Policy: https://www.ukri.org/who-we-are/nerc/our-policies-and-standards/nerc-data-policy/
- Use constraints
- Other restrictions
- Other constraints
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This data is governed by the NERC data policy and supplied under Open Government Licence v.3
- Use constraints
- Other restrictions
- Other constraints
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No restrictions apply.
- Unique resource identifier
- url
- Codespace
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url
- Association Type
- Cross reference
- Unique resource identifier
- url
- Codespace
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url
- Association Type
- Cross reference
- Spatial representation type
- Text, table
- Language
- English
- Character set
- UTF8
- Topic category
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- Climatology, meteorology, atmosphere
- Environment
- Geoscientific information
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- Begin date
- 2017-11-22
- End date
- 2017-11-29
- Supplemental Information
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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.
- Title
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European Petroleum Survey Group (EPSG) Geodetic Parameter Registry
- Date (Publication)
- 2008-11-12
- Cited responsible party
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Organisation name Individual name Electronic mail address Role European Petroleum Survey Group
Publisher
- Unique resource identifier
- urn:ogc:def:crs:EPSG::3031
- Version
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6.18.3
Distributor
- Distributor contact
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Organisation name Individual name Electronic mail address Role NERC EDS UK Polar Data Centre Distributor
- Distributor format
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Name Version text/plain application/pdf application/octet-stream
- Units of distribution
-
bytes
- Transfer size
- 1610612736
- OnLine resource
-
Protocol Linkage Name WWW:LINK-1.0-http--link
https://ramadda.data.bas.ac.uk/repository/entry/show?entryid=147baf64-b9af-4a97-8091-26aec0d3c0bb Get Data
- Units of distribution
-
bytes
- Transfer size
- 1610612736
- OnLine resource
-
Protocol Linkage Name WWW:LINK-1.0-http--link
https://ramadda.data.bas.ac.uk/repository/entry/show?entryid=147baf64-b9af-4a97-8091-26aec0d3c0bb Get Data
- Units of distribution
-
bytes
- Transfer size
- 1610612736
- OnLine resource
-
Protocol Linkage Name WWW:LINK-1.0-http--link
https://ramadda.data.bas.ac.uk/repository/entry/show?entryid=147baf64-b9af-4a97-8091-26aec0d3c0bb Get Data
- Hierarchy level
- Dataset
- Statement
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Methodology:
Seismic data were recorded using Geometrics GEODE instrumentation, deploying 24 10 Hz geophones at 10 m intervals. Each record is 1 s long, sampled at 62.5 us. A hammer-and-plate seismic source was deployed, with offsets from the first geophone extending to ±200 m, typically recording 5 shots at each location. The line was sequentially rotated about a common midpoint, relative to the dominant ~easterly flow direction. As the acquisition azimuth varies, variations in the travel-time of either first-breaks or reflections can be used to infer any trends in anisotropy and therefore stress condition. The acquisition is fully documented within the Observer's Logs which accompany these data.
Data collection:
Instrumentation: Geometrics GEODE seismic system. 24x10 Hz geophones.
Data quality:
Data from S2, acquired on 22/11/2017, are generally of good quality, with clear first breaks and visible bed reflections after minimal processing; the reflection from the underlying sea-bed is also typically visible, even in unstacked data. Data are supplied in raw format here, but an Ormsby bandpass filter with corner frequencies at 75-150-300-600 Hz, plus a 100 ms AGC window, provides good improvement to the visibility of arrivals. The good quality of these data is attributed to simple structure at the site, plus calm weather conditions at the time of acquisition (22/11/2017). Note that the time was incorrectly recorded until shot record 150. A 2 hour shift is needed, then a one hour shift after note.
Data from S1 are rather noisier, likely a result of windy weather at the time of acquisition (28/11/2017). The same processing parameters reveal base-ice reflections, but these are typically less coherent than the equivalents at S2. On stacking, base-ice reflections are improved but the data would benefit from ground-roll suppression.
S1 central location: 67.79944383°S, 61.825091°W
S2 central location: 68.00410°S, 62.568916°W
The acquisition is fully documented within the Observer's Logs which accompany these data.
Metadata
- File identifier
- 147baf64-b9af-4a97-8091-26aec0d3c0bb XML
- Metadata language
- English
- Character set
- UTF8
- Hierarchy level
- Dataset
- Hierarchy level name
-
dataset
- Date stamp
- 2019-08-14
- Metadata standard name
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ISO 19115 Geographic Information - Metadata
- Metadata standard version
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ISO 19115:2003(E)
- Metadata author
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Organisation name Individual name Electronic mail address Role NERC EDS UK Polar Data Centre Point of contact
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