Items where NERC Author is "Brisbourne, Alex"

Schlegel, Rebecca ORCID: https://orcid.org/0000-0003-1149-2816; Brisbourne, Alex M. ORCID: https://orcid.org/0000-0002-9887-7120; Smith, Andrew M. ORCID: https://orcid.org/0000-0001-8577-482X; Booth, Adam D.; Murray, Tavi; King, Edward C. ORCID: https://orcid.org/0000-0003-3793-3915; Clark, Roger A.. 2024 Subglacial bedform and moat initiation beneath Rutford Ice Stream, West Antarctica. Geomorphology, 458, 109207. 36, pp. https://doi.org/10.1016/j.geomorph.2024.109207

Lapins, S.; Butcher, A.; Kendall, J.-M.; Hudson, T.S.; Stork, A.L.; Werner, M.J.; Gunning, J.; Brisbourne, A.M. ORCID: https://orcid.org/0000-0002-9887-7120. 2024 DAS-N2N: machine learning distributed acoustic sensing (DAS) signal denoising without clean data. Geophysical Journal International, 236 (2). 1026-1041. https://doi.org/10.1093/gji/ggad460

Hudson, Thomas Samuel; Brisbourne, Alex M. ORCID: https://orcid.org/0000-0002-9887-7120; Kufner, Sofia-Katerina; Kendall, J.-Michael; Smith, Andy M. ORCID: https://orcid.org/0000-0001-8577-482X. 2023 Array processing in cryoseismology: a comparison to network-based approaches at an Antarctic ice stream. The Cryosphere, 17 (11). 4979-4993. https://doi.org/10.5194/tc-17-4979-2023

Agnew, Ronan S. ORCID: https://orcid.org/0009-0000-3609-6815; Clark, Roger A.; Booth, Adam D.; Brisbourne, Alex M. ORCID: https://orcid.org/0000-0002-9887-7120; Smith, Andrew M. ORCID: https://orcid.org/0000-0001-8577-482X. 2023 Measuring seismic attenuation in polar firn: method and application to Korff Ice Rise, West Antarctica. Journal of Glaciology. 12, pp. https://doi.org/10.1017/jog.2023.82

Hudson, T.S.; Kufner, S.K.; Brisbourne, A.M. ORCID: https://orcid.org/0000-0002-9887-7120; Kendall, J.M.; Smith, A.M. ORCID: https://orcid.org/0000-0001-8577-482X; Alley, R.B.; Arthern, R.J. ORCID: https://orcid.org/0000-0002-3762-8219; Murray, T.. 2023 Highly variable friction and slip observed at Antarctic ice stream bed. Nature Geoscience, 16 (7). 612-618. https://doi.org/10.1038/s41561-023-01204-4

Brisbourne, A.M. ORCID: https://orcid.org/0000-0002-9887-7120; Smith, Andrew ORCID: https://orcid.org/0000-0001-8577-482X; Rivera, A.; Zamora, R.; Napoleoni, F.; Uribe, J.A.; Ortega, M.. 2023 Bathymetry and bed conditions of Lago Subglacial CECs, West Antarctica. Journal of Glaciology. 10, pp. https://doi.org/10.1017/jog.2023.38

Pearce, Emma; Booth, Adam; Rost, Sebastien; Sava, Paul; Konuk, Tuğrul; Brisbourne, Alex ORCID: https://orcid.org/0000-0002-9887-7120; Hubbard, Bryn; Jones, Ian. 2023 Characterising ice slab in firn using seismic full waveform inversion, a sensitivity study. Journal of Glaciology, 85 (2). 15, pp. https://doi.org/10.1017/jog.2023.30

Kufner, S.-K. ORCID: https://orcid.org/0000-0002-9687-5455; Wookey, J.; Brisbourne, A.M. ORCID: https://orcid.org/0000-0002-9887-7120; Martín, C. ORCID: https://orcid.org/0000-0002-2661-169X; Hudson, T.S.; Kendall, J.-M.; Smith, A.M. ORCID: https://orcid.org/0000-0001-8577-482X. 2023 Strongly depth-dependent ice fabric in a fast-flowing Antarctic ice stream revealed with icequake observations. Journal of Geophysical Research: Earth Surface, 128 (3), e2022JF006853. 25, pp. https://doi.org/10.1029/2022JF006853

Zhou, Wen; Butcher, Antony; Brisbourne, Alex ORCID: https://orcid.org/0000-0002-9887-7120; Kufner, Sofia-Katerina ORCID: https://orcid.org/0000-0002-9687-5455; Kendall, J-Michael; Stork, Anna. 2022 Seismic noise interferometry and Distributed Acoustic Sensing (DAS): Inverting for the firn layer S-velocity structure on Rutford Ice Stream, Antarctica. Journal of Geophysical Research: Earth Surface, 127 (12), e2022JF006917. 17, pp. https://doi.org/10.1029/2022JF006917

Pearce, Emma; Booth, Adam D.; Rost, Sebastian; Sava, Paul; Konuk, Tuğrul; Brisbourne, Alex ORCID: https://orcid.org/0000-0002-9887-7120; Hubbard, Bryn; Jones, Ian. 2022 A synthetic study of acoustic full waveform inversion to improve seismic modelling of firn. Annals of Glaciology, 63 (87-89). 44-48. https://doi.org/10.1017/aog.2023.10

Jordan, T.M.; Martín, C. ORCID: https://orcid.org/0000-0002-2661-169X; Brisbourne, A.M. ORCID: https://orcid.org/0000-0002-9887-7120; Schroeder, D.M.; Smith, A.M. ORCID: https://orcid.org/0000-0001-8577-482X. 2022 Radar characterization of ice crystal orientation fabric and anisotropic viscosity within an Antarctic ice stream. Journal of Geophysical Research: Earth Surface, 127 (6), e2022JF006673. https://doi.org/10.1029/2022JF006673

Harrison, Lianne C. ORCID: https://orcid.org/0000-0002-7329-4674; Holland, Paul R. ORCID: https://orcid.org/0000-0001-8370-289X; Heywood, Karen J.; Nicholls, Keith W. ORCID: https://orcid.org/0000-0002-2188-4509; Brisbourne, Alex M. ORCID: https://orcid.org/0000-0002-9887-7120. 2022 Sensitivity of melting, freezing and marine ice beneath Larsen C Ice Shelf to changes in ocean forcing. Geophysical Research Letters, 49 (4), e2021GL096914. 10, pp. https://doi.org/10.1029/2021GL096914

Schlegel, Rebecca; Murray, Tavi; Smith, Andrew M. ORCID: https://orcid.org/0000-0001-8577-482X; Brisbourne, Alex M. ORCID: https://orcid.org/0000-0002-9887-7120; Booth, Adam D.; King, Edward C. ORCID: https://orcid.org/0000-0003-3793-3915; Clark, Roger A.. 2022 Radar derived subglacial properties and landforms beneath Rutford Ice Stream, West Antarctica. Journal of Geophysical Research: Earth Surface, 127 (1), e2021JF006349. 18, pp. https://doi.org/10.1029/2021JF006349

Smith, A.M. ORCID: https://orcid.org/0000-0001-8577-482X; Anker, P.G.D. ORCID: https://orcid.org/0000-0002-4359-4342; Nicholls, K.W. ORCID: https://orcid.org/0000-0002-2188-4509; Makinson, K. ORCID: https://orcid.org/0000-0002-5791-1767; Murray, T.; Rios-Costas, S.; Brisbourne, A.M. ORCID: https://orcid.org/0000-0002-9887-7120; Hodgson, D.A. ORCID: https://orcid.org/0000-0002-3841-3746; Schlegel, R.; Anandkrishnan, S.. 2021 Ice stream subglacial access for ice sheet history and fast ice flow: The BEAMISH Project on Rutford Ice Stream, West Antarctica and initial results on basal conditions [in special issue: Drilling through the Ice] Annals of Glaciology, 62 (85-86). 203 -211. https://doi.org/10.1017/aog.2020.82

McAfee, Carson W.I. ORCID: https://orcid.org/0000-0001-6454-3512; Rix, Julius ORCID: https://orcid.org/0000-0002-8048-9445; Quirk, Sean J. ORCID: https://orcid.org/0000-0001-7114-4472; Anker, Paul G.D. ORCID: https://orcid.org/0000-0002-4359-4342; Brisbourne, Alex M. ORCID: https://orcid.org/0000-0002-9887-7120; Makinson, Keith ORCID: https://orcid.org/0000-0002-5791-1767. 2021 Non-contact measurement system for hot water drilled ice boreholes [in special issue: Drilling through the Ice] Annals of Glaciology, 62 (85-86). 223-232. https://doi.org/10.1017/aog.2020.85

Brisbourne, Alex M. ORCID: https://orcid.org/0000-0002-9887-7120; Kendall, Michael; Kufner, Sofia-Katerina ORCID: https://orcid.org/0000-0002-9687-5455; Hudson, Thomas S.; Smith, Andrew M. ORCID: https://orcid.org/0000-0001-8577-482X. 2021 Downhole distributed acoustic seismic profiling at Skytrain Ice Rise, West Antarctica. The Cryosphere, 15 (7). 3443-3458. https://doi.org/10.5194/tc-15-3443-2021

Hudson, T.S.; Baird, A.F.; Kendall, J.M.; Kufner, S.-K. ORCID: https://orcid.org/0000-0002-9687-5455; Brisbourne, A.M. ORCID: https://orcid.org/0000-0002-9887-7120; Smith, A.M. ORCID: https://orcid.org/0000-0001-8577-482X; Butcher, A.; Chalari, A.; Clarke, A.. 2021 Distributed Acoustic Sensing (DAS) for natural microseismicity studies: A case study from Antarctica. Journal of Geophysical Research: Solid Earth, 126 (7), e2020JB021493. 19, pp. https://doi.org/10.1029/2020JB021493

Kufner, Sofia-Katerina ORCID: https://orcid.org/0000-0002-9687-5455; Brisbourne, Alex M. ORCID: https://orcid.org/0000-0002-9887-7120; Smith, Andrew M. ORCID: https://orcid.org/0000-0001-8577-482X; Hudson, Thomas S.; Murray, Tavi; Schlegel, Rebecca; Kendall, John M.; Anandakrishnan, Sridhar; Lee, Ian. 2021 Not all icequakes are created equal: basal icequakes suggest diverse bed deformation mechanisms at Rutford Ice Stream, West Antarctica. Journal of Geophysical Research: Earth Surface, 126 (3), e2020JF006001. https://doi.org/10.1029/2020JF006001

Hudson, T. ORCID: https://orcid.org/0000-0003-2944-883X; Baird, A.; Kendall, M.; Kufner, S-K. ORCID: https://orcid.org/0000-0002-9687-5455; Brisbourne, A. ORCID: https://orcid.org/0000-0002-9887-7120; Smith, A.; Butcher, A.; Chalari, A.; Clarke, A.. 2021 Distributed Acoustic Sensing in Antarctica: What we can learn for studying microseismicity elsewhere. EAGE GeoTech 2021 Second EAGE Workshop on Distributed Fibre Optic Sensing, 2021. 5, pp. https://doi.org/10.3997/2214-4609.202131037

Kendall, M.; Brisbourne, Alex ORCID: https://orcid.org/0000-0002-9887-7120; Hudson, T. ORCID: https://orcid.org/0000-0003-2944-883X; Kufner, S-K. ORCID: https://orcid.org/0000-0002-9687-5455; Butcher, A.; Baird, A.; Smith, A. ORCID: https://orcid.org/0000-0001-8577-482X; Chalari, A.; Clarke, A.. 2021 Listening to Ice Sheets - Fibre Optic Cables as Seismic Sensors in the Antarctic. EAGE GeoTech 2021 Second EAGE Workshop on Distributed Fibre Optic Sensing, 2021. 5, pp. https://doi.org/10.3997/2214-4609.202131076

Butcher, A.; Hudson, T. ORCID: https://orcid.org/0000-0003-2944-883X; Kendall, M.; Kufner, S-K. ORCID: https://orcid.org/0000-0002-9687-5455; Brisbourne, A. ORCID: https://orcid.org/0000-0002-9887-7120; Stork, A.. 2021 Radon transform-based detection of microseismicity on DAS networks: A case study from Antarctica. EAGE GeoTech 2021 Second EAGE Workshop on Distributed Fibre Optic Sensing, 2021. 4, pp. https://doi.org/10.3997/2214-4609.202131039

Napoleoni, Felipe; Jamieson, Stewart S.R.; Ross, Neil; Bentley, Michael J.; Rivera, Andrés; Smith, Andrew M. ORCID: https://orcid.org/0000-0001-8577-482X; Siegert, Martin J.; Paxman, Guy J. G.; Gacitúa, Guisella; Uribe, José A.; Zamora, Rodrigo; Brisbourne, Alex M. ORCID: https://orcid.org/0000-0002-9887-7120; Vaughan, David G. ORCID: https://orcid.org/0000-0002-9065-0570. 2020 Subglacial lakes and hydrology across the Ellsworth Subglacial Highlands, West Antarctica. The Cryosphere, 14. 4507-4524. https://doi.org/10.5194/tc-14-4507-2020

Dunham, C.K.; O’Donnell, J.P.; Stuart, G W; Brisbourne, A.M. ORCID: https://orcid.org/0000-0002-9887-7120; Rost, S.; Jordan, T.A. ORCID: https://orcid.org/0000-0003-2780-1986; Nyblade, A.A.; Wiens, D.A.; Aster, R.C.. 2020 A joint inversion of receiver function and Rayleigh wave phase velocity dispersion data to estimate crustal structure in West Antarctica. Geophysical Journal International, 223 (3). 1644-1657. https://doi.org/10.1093/gji/ggaa398

Hudson, T.S.; Brisbourne, A.M. ORCID: https://orcid.org/0000-0002-9887-7120; White, R.S.; Kendall, J.M.; Arthern, R. ORCID: https://orcid.org/0000-0002-3762-8219; Smith, A.M. ORCID: https://orcid.org/0000-0001-8577-482X. 2020 Breaking the ice: Identifying hydraulically-forced crevassing. Geophysical Research Letters, 47 (21), e2020GL090597. 9, pp. https://doi.org/10.1029/2020GL090597

Hudson, T.S. ORCID: https://orcid.org/0000-0003-2944-883X; Brisbourne, A.M. ORCID: https://orcid.org/0000-0002-9887-7120; Walter, F.; Graff, D.; White, R.S.; Smith, A.M. ORCID: https://orcid.org/0000-0001-8577-482X. 2020 Icequake source mechanisms for studying glacial sliding. Journal of Geophysical Research: Earth Surface, 125 (11), e2020JF005627. https://doi.org/10.1029/2020JF005627

Jordan, Thomas; Brisbourne, Alex ORCID: https://orcid.org/0000-0002-9887-7120; Martin Garcia, Carlos ORCID: https://orcid.org/0000-0002-2661-169X; Schlegel, Rebecca; Schroeder, Dustin; Smith, Andrew ORCID: https://orcid.org/0000-0001-8577-482X. 2020 Relating radar-sounding measurements of ice fabric to ice-flow enhancement of Rutford Ice Stream. [Lecture] In: EGU General Assembly 2020, Online, 4–8 May 2020. Online, EGU.

Brisbourne, Alex ORCID: https://orcid.org/0000-0002-9887-7120; Kulessa, Bernd; Hudson, Thomas ORCID: https://orcid.org/0000-0003-2944-883X; Harrison, Lianne ORCID: https://orcid.org/0000-0002-7329-4674; Holland, Paul ORCID: https://orcid.org/0000-0001-8370-289X; Luckman, Adrian; Bevan, Suzanne; Ashmore, David; Hubbard, Bryn; Pearce, Emma; White, James; Booth, Adam; Nicholls, Keith ORCID: https://orcid.org/0000-0002-2188-4509; Smith, Andrew ORCID: https://orcid.org/0000-0001-8577-482X. 2020 An updated seabed bathymetry beneath Larsen C Ice Shelf, Antarctic Peninsula. Earth System Science Data, 12. 887-896. https://doi.org/10.5194/essd-12-887-2020

O'Donnell, J.P.; Brisbourne, A.M. ORCID: https://orcid.org/0000-0002-9887-7120; Stuart, G.W.; Dunham, C.K.; Yang, Y.; Nield, G.A.; Whitehouse, P.L.; Nyblade, A.A.; Wiens, D.A.; Anadakrishnan, S.; Aster, R.C.; Huerta, A.D.; Lloyd, A.J.; Wilson, T.; Winberry, J.P.. 2019 Mapping crustal shear wave velocity structure and radial anisotropy beneath West Antarctica using seismic ambient noise. Geochemistry, Geophysics, Geosystems, 20 (11). 5014-5037. https://doi.org/10.1029/2019GC008459

O'Donnell, J.P.; Stuart, G.W.; Brisbourne, A.M. ORCID: https://orcid.org/0000-0002-9887-7120; Selway, K.; Yang, Y.; Nield, G.A.; Whitehouse, P.L; Nyblade, A.A.; Wiens, D.A.; Aster, R.C.; Anandakrishnan, S.; Herta, A.D.; Wilson, T.; Winberry, J.P.. 2019 The uppermost mantle seismic velocity structure of West Antarctica from Rayleigh wave tomography: insights into tectonic structure and geothermal heat flow. Earth and Planetary Science Letters, 522. 219-233. https://doi.org/10.1016/j.epsl.2019.06.024

Hudson, Thomas S. ORCID: https://orcid.org/0000-0003-2944-883X; Smith, Jonathan; Brisbourne, Alex M. ORCID: https://orcid.org/0000-0002-9887-7120; White, Robert S.. 2019 Automated detection of basal icequakes and discrimination from surface crevassing. Annals of Glaciology, 60 (79). 167-181. https://doi.org/10.1017/aog.2019.18

Brisbourne, Alex M. ORCID: https://orcid.org/0000-0002-9887-7120; Martin, Carlos ORCID: https://orcid.org/0000-0002-2661-169X; Smith, Andy M. ORCID: https://orcid.org/0000-0001-8577-482X; Baird, A.F.; Kendall, J.M.; Kingslake, J.. 2019 Constraining recent ice flow history at Korff Ice Rise, West Antarctica, using radar and seismic measurements of ice fabric. Journal of Geophysical Research: Earth Surface, 124 (1). 175-194. https://doi.org/10.1029/2018JF004776

Bougamont, M.; Christoffersen, P.; Nias, I.; Vaughan, David G. ORCID: https://orcid.org/0000-0002-9065-0570; Smith, Andy ORCID: https://orcid.org/0000-0001-8577-482X; Brisbourne, Alex ORCID: https://orcid.org/0000-0002-9887-7120. 2019 Contrasting hydrological controls on bed properties during the acceleration of Pine Island Glacier, West Antarctica. Journal of Geophysical Research: Earth Surface, 124 (1). 80-96. https://doi.org/10.1029/2018JF004707

Rosier, Sebastian H.R. ORCID: https://orcid.org/0000-0003-3047-9908; Hofstede, C.; Brisbourne, Alex M. ORCID: https://orcid.org/0000-0002-9887-7120; Hattermann, T.; Nicholls, Keith W. ORCID: https://orcid.org/0000-0002-2188-4509; Davis, Peter E.D. ORCID: https://orcid.org/0000-0002-6471-6310; Anker, Paul G.D. ORCID: https://orcid.org/0000-0002-4359-4342; Hillenbrand, Claus-Dieter ORCID: https://orcid.org/0000-0003-0240-7317; Smith, Andy M. ORCID: https://orcid.org/0000-0001-8577-482X; Corr, Hugh F.J.. 2018 A new bathymetry for the southeastern Filchner-Ronne Ice Shelf: implications for modern oceanographic processes and glacial history. Journal of Geophysical Research: Oceans, 123 (7). 4610-4623. https://doi.org/10.1029/2018JC013982

Davies, Damon; Bingham, Robert G.; King, Edward C. ORCID: https://orcid.org/0000-0003-3793-3915; Smith, Andrew M. ORCID: https://orcid.org/0000-0001-8577-482X; Brisbourne, Alex M. ORCID: https://orcid.org/0000-0002-9887-7120; Spagnolo, Matteo; Graham, Alastair G. C.; Hogg, Anna E.; Vaughan, David G. ORCID: https://orcid.org/0000-0002-9065-0570. 2018 How dynamic are ice-stream beds? The Cryosphere, 12. 1615-1628. https://doi.org/10.5194/tc-12-1615-2018

Bingham, Robert G.; Vaughan, David G. ORCID: https://orcid.org/0000-0002-9065-0570; King, Edward C. ORCID: https://orcid.org/0000-0003-3793-3915; Davies, Damon; Cornford, Stephen L.; Smith, Andrew M. ORCID: https://orcid.org/0000-0001-8577-482X; Arthern, Robert J. ORCID: https://orcid.org/0000-0002-3762-8219; Brisbourne, Alex M. ORCID: https://orcid.org/0000-0002-9887-7120; De Rydt, Jan; Graham, Alastair G. C.; Spagnolo, Matteo; Marsh, Oliver J.; Shean, David E.. 2017 Diverse landscapes beneath Pine Island Glacier influence ice flow. Nature Communications, 8 (1), 1618. 9, pp. https://doi.org/10.1038/s41467-017-01597-y

Hudson, T.S. ORCID: https://orcid.org/0000-0003-2944-883X; White, R.S.; Greenfield, T.; Ágústsdóttir, T.; Brisbourne, A. ORCID: https://orcid.org/0000-0002-9887-7120; Green, R.G.. 2017 Deep crustal melt plumbing of Bárðarbunga volcano, Iceland. Geophysical Research Letters, 44 (17). 8785-8794. https://doi.org/10.1002/2017GL074749

Smith, Emma C.; Baird, Alan F.; Kendall, Michael; Martín, Carlos ORCID: https://orcid.org/0000-0002-2661-169X; White, Robert S.; Brisbourne, Alex M. ORCID: https://orcid.org/0000-0002-9887-7120; Smith, Andrew M. ORCID: https://orcid.org/0000-0001-8577-482X. 2017 Ice fabric in an Antarctic ice stream interpreted from seismic anisotropy. Geophysical Research Letters, 44 (8). 3710-3718. https://doi.org/10.1002/2016GL072093

Brisbourne, Alex M. ORCID: https://orcid.org/0000-0002-9887-7120; Smith, Andy M. ORCID: https://orcid.org/0000-0001-8577-482X; Vaughan, David G. ORCID: https://orcid.org/0000-0002-9065-0570; King, Edward C. ORCID: https://orcid.org/0000-0003-3793-3915; Davies, D.; Bingham, R.G.; Smith, E.C.; Nias, I.J.; Rosier, Sebastian H.R. ORCID: https://orcid.org/0000-0003-3047-9908. 2017 Bed conditions of Pine Island Glacier, West Antarctica. Journal of Geophysical Research: Earth Surface, 122 (1). 419-433. https://doi.org/10.1002/2016JF004033

Smith, E.C.; Smith, A.M. ORCID: https://orcid.org/0000-0001-8577-482X; White, R.S.; Brisbourne, A.M. ORCID: https://orcid.org/0000-0002-9887-7120; Pritchard, H.D. ORCID: https://orcid.org/0000-0003-2936-1734. 2015 Mapping the ice-bed interface characteristics of Rutford Ice Stream, West Antarctica, using microseismicity. Journal of Geophysical Research: Earth Surface, 120 (9). 1881-1894. https://doi.org/10.1002/2015JF003587

Holland, P.R. ORCID: https://orcid.org/0000-0001-8370-289X; Brisbourne, A. ORCID: https://orcid.org/0000-0002-9887-7120; Corr, H.F.J.; McGrath, D.; Purdon, K.; Paden, J.; Fricker, H.A.; Paolo, F.S.; Fleming, A.H. ORCID: https://orcid.org/0000-0002-0143-4527. 2015 Oceanic and atmospheric forcing of Larsen C Ice-Shelf thinning. The Cryosphere, 9. 1005-1024. https://doi.org/10.5194/tc-9-1005-2015

Brisbourne, Alex ORCID: https://orcid.org/0000-0002-9887-7120; Smith, Andy ORCID: https://orcid.org/0000-0001-8577-482X; King, Edward ORCID: https://orcid.org/0000-0003-3793-3915; Nicholls, Keith ORCID: https://orcid.org/0000-0002-2188-4509; Holland, Paul ORCID: https://orcid.org/0000-0001-8370-289X; Makinson, Keith ORCID: https://orcid.org/0000-0002-5791-1767. 2014 Seabed topography beneath Larsen C Ice Shelf from seismic soundings. The Cryosphere, 8. 1-13. https://doi.org/10.5194/tc-8-1-2014

Pomeroy, Joseph; Brisbourne, Alex ORCID: https://orcid.org/0000-0002-9887-7120; Evans, Jeffrey; Graham, David. 2013 The search for seismic signatures of movement at the glacier bed in a polythermal valley glacier. Annals of Glaciology, 54 (64). 149-156. https://doi.org/10.3189/2013AoG64A203