Abstract:
In 2016, a series of ice shelf cavity bathymetry point measurements were
made across Larsen C Ice Shelf, West Antarctica. The sites were selected
to address deficiencies in the coverage provided by existing data sets. A
hammer and plate seismic source was used. Seismic reflection data were
recorded on 24 receivers at 10 m interval and 30 m offset. Sea bed
reflections are observed at all sites. Surface elevation measurements are
provided to allow estimation of ice thickness when an ice base reflection is
not visible.
Funded as part of the Polar Science for Planet Earth Programme, British Antarctic Survey, Natural Environment Research Council.
Keywords:
Antarctic Peninsula, Bathymetry, Larsen C Ice Shelf, Seismic Reflection
Brisbourne, A., Hudson, T., & Holland, P. (2019). Seismic bathymetry data, Antarctic Peninsula, Larsen C Ice Shelf, 2016 (Version 1.0) [Data set]. UK Polar Data Centre, Natural Environment Research Council, UK Research & Innovation. https://doi.org/10.5285/315740b1-a7b9-4cf0-9521-86f046e33e9a
| Use Constraints: | This data is governed by the NERC data policy http://www.nerc.ac.uk/research/sites/data/policy/ and supplied under Open Government Licence v.3 http://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/. |
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| Creation Date: | 2019-10-14 |
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| Dataset Progress: | Planned |
| Dataset Language: | English |
| ISO Topic Categories: |
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| Parameters: |
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| Personnel: | |
| Name | Alex M Brisbourne |
| Role(s) | Technical Contact, Investigator |
| Organisation | British Antarctic Survey |
| Name | Paul R Holland |
| Role(s) | Investigator |
| Organisation | British Antarctic Survey |
| Name | Thomas S Hudson |
| Role(s) | Investigator |
| Organisation | British Antarctic Survey |
| Parent Dataset: | N/A |
| Reference: | Brisbourne, A. M., B. Kulessa et al. (in prep., September 2019). An updated bathymetry of Larsen C Ice Shelf, West Antarctica. Earth System Science Data. Brisbourne, A. M., Smith, A. M., King, E. C., Nicholls, K. W., Holland, P. R., & Makinson, K. (2014). Seabed topography beneath Larsen C Ice Shelf from seismic soundings. The Cryosphere, 8(1), 1-13. doi:10.5194/tc-8-1- 2014. Voigt, D. E., L. E. Peters, and S. Anandakrishnan (2013), 'Georods': the development of a four-element geophone for improved seismic imaging of glaciers and ice sheets, Ann. Glaciol., 54(64), 142-148, doi:10.3189/2013AoG64A432. |
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| Quality: | Raw data are provided and data quality can therefore be readily assessed. Data quality will vary from shot to shot due to the nature of using a hammer source. |
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| Lineage: | The seismic reflection data were collected using a hammer and plate source into 24 surface receivers at 30 m offset and 10 m interval. At each site, around 20 single blow records were collected as well as an on-site stack of 10 hammer blows. Seismic data were recorded at 8 kHz sample rate. The Fresnel zone is dependent on ice and water column thickness and therefore site specific. The dual frequency GPS data were collected with a Trimble R7 GPS unit at each site to obtain an accurate surface elevation. |
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| Temporal Coverage: | |
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| Start Date | 2016-11-19 |
| End Date | 2016-12-03 |
| Spatial Coverage: | |
| Latitude | |
| Southernmost | -70 |
| Northernmost | -66 |
| Longitude | |
| Westernmost | -65 |
| Easternmost | -60 |
| Altitude | |
| Min Altitude | N/A |
| Max Altitude | N/A |
| Depth | |
| Min Depth | N/A |
| Max Depth | N/A |
| Location: | |
| Location | Antarctica |
| Detailed Location | Larsen C Ice Shelf, Antarctic Peninsula |
| Data Collection: | The seismic reflection data were collected with 1 x Geometrics Geode seismograph with 40 Hz vertical georods. The dual frequency GPS data were collected with a Trimble R7 GPS unit. |
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| Data Storage: | Raw data are provided in SEG-2 format as exported by the Geometrics Geode unit. The shot and receiver geometry is encoded in the data header. However, the site coordinates are not included in the data file headers but are provided in a separate .csv metadata file. At each site, around 20 individual hammer blows are recorded as single files. An on-site stack record of 10 shots was also recorded and is provided in a separate single file. The dual frequency GPS data are provided as raw Trimble (.t01), and the same data converted to RINEX format (.16o & .16n). |
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