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Structure of a surge type glacier from multi-offset ground penetrating radar (SIOS 2017_0016) (SuMOGPR)

This project aims to collect multi-offset Ground Penetrating Radar datasets on Von Postbreen, a polythermal surge-type glacier in Svalbard. Multi-offset datasets present an opportunity to improve our understanding of englacial and subglacial conditions from the surface.

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Project date

Starts
2018-01-01

Ends
2018-04-30

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Project type

  • field work
  • sios

Discipline

  • cryosphere

Project Keywords

  • cryosphere / glaciers/ice sheets / glacier motion/ice sheet motion

Fieldwork information

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Summary

Ground Penetrating Radar is widely used to observe the basal topography of glaciers and ice sheets. A typical survey consists of a single source and receiver at common offset, occasionally with a common mid-point survey to derive the englacial radar velocity for processing purposes. Accordingly, there are limitations on the processing and quantitative interpretations that can be extracted from such datasets, hindering our understanding of the internal dynamics of glaciers. Much progress has been made in the seismic research community of processing and inversion of multi-offset seismic datasets to improve image quality, and analysis of propagation velocity structure of the subsurface. Little work has been undertaken in this direction however in glacial GPR surveys, despite electromagnetic and acoustic propagation being analogous. This project aims to collect multi-offset GPR datasets on Von Postbreen, a polythermal surge-type glacier in Svalbard. Processing to deduce englacial velocity structure will be undertaken, and the resultant improvement in image quality will be assessed. Multi-offset datasets present an opportunity to improve our understanding of englacial and subglacial conditions from the surface, and this study will guide the design and implementation of future systems in the polar regions.

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