Measurement of Short Period Variations in the Speed of Ice Stream B, West Antarctica

点击翻译按钮获取中文摘要

The objectives of this investigation is to determine the presence of short-period variability in the flow of Ice Stream B, West Antarctica and to measure the propagation of any observable motion events along the ice stream. The results of this study, when combined with the borehole measurements (basal water pressure, motion at and within the bed), will lead to a more complete understanding of the mechanisms which govern ice stream flow and fast glacier motion in general. A linear array of high-resolution vertical wire strain meters and geophones will continuously monitor temporal changes in the strain field and seismic activity over a one to two-year period. The array will be centered at the Upstream B drill site and will overlap with a strain grid. Flow velocity at the drill site will be measured daily during the field season. Taken together, these measurements will delineate any flow variations which arise from changing conditions at the basal interface. As such, the proposed research will form an important and integral part of the borehole drilling program on Ice Stream B.