Abstract:
3D vertically-polarised shear wave (Vsv) velocity model of West Antarctic crustal structure developed using data from the 2016-2018 UK Antarctic Seismic Network (UKANET) and Polar Earth Observing Seismic Network (POLENET). Interstation Rayleigh and Love wave phase velocity dispersion measurements at periods of 8-25 seconds were extracted from seismic ambient noise cross-correlograms by automated frequency-time analysis (AFTAN). The ensemble of interstation Rayleigh wave dispersion measurements was used to develop 2D Rayleigh wave phase velocity maps of West Antarctica at periods of 8-25 seconds by Fast Marching Surface Tomography (FMST) on a grid with a node spacing of 0.75deg. 'Local' 1D Rayleigh wave phase velocity dispersion curves were extracted by sampling the 2D Rayleigh wave phase velocity maps at grid node locations. The local 1D Rayleigh wave phase velocity dispersion curves were inverted for 1D shear wave (Vsv) structure to 40 km depth, and the ensemble of 1D shear wave (Vsv) profiles were subsequently gridded to produce the 3D shear wave (Vsv) model of West Antarctica from 10-40 km depth.
Funding was provided by the NERC standard grant NE/L006065/1.
Keywords:
West Antarctica, ambient noise, crust, seismology, tectonics
O'Donnell, J., Stuart, G., & Brisbourne, A. (2019). 3D shear wave (Vsv) velocity model of West Antarctic crustal structure (Version 1.0) [Data set]. UK Polar Data Centre, Natural Environment Research Council, UK Research & Innovation. https://doi.org/10.5285/b5ffac8a-9846-4f86-9a71-3ce992a18148
| Access Constraints: | No restrictions apply to the data held in this repository. The UKANET raw seismic data will be accessible through the Incorporated Research Institutions for Seismology (IRIS) Data Management Center (http://www.iris.edu/mda) from January 2021. |
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| 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/. |
| Creation Date: | 2019-05-02 |
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| Dataset Progress: | Complete |
| Dataset Language: | English |
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| Parameters: |
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| Personnel: | |
| Name | UK PDC |
| Role(s) | Metadata Author |
| Organisation | British Antarctic Survey |
| Name | John P O'Donnell |
| Role(s) | Technical Contact, Investigator |
| Organisation | University of Leeds |
| Name | Graham Stuart |
| Role(s) | Investigator |
| Organisation | University of Leeds |
| Name | Alexander M Brisbourne |
| Role(s) | Investigator |
| Organisation | British Antarctic Survey |
| Parent Dataset: | N/A |
| Reference: | O'Donnell, J. P. et al., submitted. Mapping crustal shear wave velocity structure and radial anisotropy beneath West Antarctica using seismic ambient noise. Brisbourne, A., Stuart G. and O'Donnell, J. P., 2016. UKANET: UK Antarctic Network. International Federation of Digital Seismograph Networks. Dataset/Seismic Network, doi:10.7914/SN/1D_2016 |
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| Quality: | A detailed description of the data collection, quality control, processing and analysis is given in: O'Donnell, J. P. et al., 2019. Mapping crustal shear wave velocity structure and radial anisotropy beneath West Antarctica using seismic ambient noise. | |
| Lineage: | The UKANET seismic network was deployed in austral summer 2015-2016 and consisted of 10 stations located across the southern Antarctic Peninsula and Ellsworth Land. Each station had a cold-rated Guralp CMG-3T 120 s seismometer sampling at 1 and 100 samples per second. The network was demobilised in austral summer 2017-2018. A detailed description of the data collection, quality control, processing and analysis is given in: O'Donnell, J. P. et al., 2019. Mapping crustal shear wave velocity structure and radial anisotropy beneath West Antarctica using seismic ambient noise. | |
| Temporal Coverage: | |
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| Start Date | 2016-01-12 |
| End Date | 2018-02-08 |
| Spatial Coverage: | |
| Latitude | |
| Southernmost | -88 |
| Northernmost | -71 |
| Longitude | |
| Westernmost | -180 |
| Easternmost | 180 |
| Altitude | |
| Min Altitude | N/A |
| Max Altitude | N/A |
| Depth | |
| Min Depth | 10km |
| Max Depth | 40km |
| Location: | |
| Location | Antarctica |
| Detailed Location | West Antarctica |
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| Data Collection: | The UKANET network used cold-rated Guralp CMG-3T 120 s seismometers sampling at 1 and 100 samples per second combined with Quanterra Q330 digitisers and B44 balers. Resolution: Lateral resolution is variable, depending on the seismic station locations. The 3D shear wave (Vsv) velocity model resolves lateral structure of wavelength 300 km with high fidelity in central West Antarctica. |
| Data Storage: | Directory 'InterstationDispersionCurves' holds the interstation Rayleigh and Love wave phase velocity dispersion measurements. Directory 'AmbientNoiseTomography' holds the Rayleigh wave phase velocity tomography model in sub-directory ''PhaseVelocity' and the VSV shear wave velocity model in sub-directory 'ShearVelocity'. 1D phase and shear velocity profiles are provided in text and pictorial (pdf) format; 2D phase and shear velocity grids are provided in NETCDF-format. 'README' files within each directory/sub-directory specify model file name conventions, formats and units in detail. The total size of the repository is 116 MB. |
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