Infuence of subglacial geology on the onset of a West Antarctic ice stream from aerogeophysical observations

Article Abstract:

The collapse of marine ice-sheets can cause rapid sea-level rise. The West Antarctic Ice Sheet has an amount of ice equivalent to around six metres of sea-level rise. A small part of the ice sheet consists of ice steams draining ice to the sea. This system is likely to govern the process of ice-sheet collapse. Aerogeophysical measurements were used to constrain the geological setting of the onset of an active West Antarctic ice stream, and the onset coincided with a sediment filled basin cut through by a steep-sided valley.

Sea level

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Active volcanism beneath the West Antarctic ice sheet and implications for ice-sheet stability

Article Abstract:

Satellite photographs provide evidence of active volcanism under the West Antarctic ice sheet (WAIS). Volcanic heating of the base of the sheet may be responsible for the formation of ice streams. Ice streams protect the inland ice from exposure to oceanic currents and consequent heating. The presence of ice streams may insulate the ice sheet from climactic changes. Thus, active volcanism under the WAIS may moderate the effects of climactic change and reduce the threat that would be posed by the collapse of the WAIS.

Forecasts and trends, Antarctica, Antarctic regions, Volcanism

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Aerogeophysical measurements of collapse-prone hydrothermally altered zones at Mount Rainier volcano

Article Abstract:

Research is presented concerning the use of aerogeophysical techniques to measure the zones of the Mount Rainier volcano, Washington, which may be prone to collapse due to hydrothermally altered rocks.

Volcanoes, Letter to the Editor, Geophysical prediction, Mount Rainier, Maryland

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