A5077597610- Cryospheric studies and observations
- Landslides and related hazards
- Seismic Waves and Analysis
- Winter Sports Injuries and Performance
- Polar Research and Ecology
- Geology and Paleoclimatology Research
British Antarctic Survey
2023-2025
University of Leeds
2023-2025
Subglacial topography and the character of a glacier’s basal material have controlling effect on ice flow are therefore important to parameterise in sheet models. Seismic surveys provide means characterise materials through estimation elastic parameters bed (for example, acoustic impedance Poisson’s ratio). The subglacial Thwaites glacier is oriented across flow, with series ridges running East West glacier. vicinity ridge ~60km upstream grounding zone, named GHOST ridge,...
Glacier grounding zones, where ice transitions from resting on land to floating ocean, are critical understanding sheet dynamics and stability. Despite their importance, these regions challenging study directly due inaccessibility the inherent risks of fieldwork. To address this, we conducted seismic investigations at Eastwind Glacier, Antarctica, an accessible zone near McMurdo Station Scott Base, as part EGGS TOAST project. Our fieldwork included deploying 330 three-component nodes across...
Abstract We present seismic measurements of the firn column at Korff Ice Rise, West Antarctica, including compressional-wave velocity and attenuation. describe a modified spectral-ratio method measuring quality factor ( Q ) based on analysis diving waves, which, combined with stochastic error propagation, enables us to characterise attenuative structure in greater detail than has previously been possible. increases from 56 ± 23 uppermost 12 m 570 450 between 55 77 depth. corroborate our...
The stability of Thwaites Glacier, the second largest marine ice stream in West Antarctica, is a major source uncertainty future predictions global sea level rise. Critical to understanding dynamics shear margins, which provide important lateral resistance that counters basal weakening associated with flow acceleration and forcing at grounding line. eastern margin Glacier interest as it poorly topographically constrained, meaning could migrate rapidly, causing further drawing larger volume...
Reconstructing past ice sheets is important for understanding the response of modern to changes in climate. The evolution Weddell Sea Sector’s grounding line since last glacial maximum (LGM) its present position remains ambiguous; previous authors have proposed hypotheses both monotonic retreat and rapid followed by readvance. However, distinguishing these scenarios with current observations difficult. To explore scenarios, we report seismic measurements basal properties at KIR, an...
When modelling ice sheet and glacier dynamics, a consideration of basal conditions is essential. Bed topography, hydrology materials provide important controls on flow; however, the underlying large sections polar sheets are unknown. Seismic amplitude-versus-offset (AVO) analysis provides means inferring bed properties, namely acoustic impedance Poisson's ratio, by measuring reflectivity as function incidence angle.However, existing methods applying AVO to glaciology only consider...
The stability of Thwaites Glacier, the second largest marine ice stream in West Antarctica, is a major source uncertainty future predictions global sea level rise. Critical to understanding dynamics shear margins, which provide important lateral resistance that counters basal weakening associated with flow acceleration and forcing at grounding line. eastern margin interest, as it poorly topographically constrained, meaning could migrate rapidly, causing further drawing larger volume into...
We present seismic measurements of the firn column at Korff Ice Rise, West Antarctica, including compressional- and shear-wave velocity attenuation. describe a modified spectral-ratio method measuring quality factor (Q) based on analysis diving waves, which enables us to characterise attenuative structure in greater detail than has previously been possible. The compressional-wave factor, Qp, increases from 20 ± 10 uppermost 423 260 between 77 86 m depth, Qs, 16 9 100 87 49 64 depth. Our aids...
<p><span>Comprehensive descriptions of the seismic properties glaciers and ice masses require that both compressional (P-) shear (S-) wave components are considered. Among these is attenuation, expressed by Quality Factor (Q). Q valuable for two reasons: first, to correct measurements amplitude wavelet propagation effects, as in reflection amplitude-versus-angle (AVA) studies. Second, an indicator such temperature impurity content, laboratory/field studies soils...