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Antarctic ice velocities from GPS locations logged by seismic stations

  • Meijian An (a1), Douglas Wiens (a2), Chunlei An (a3), Guitao Shi (a3), Yue Zhao (a1) and Yuansheng Li (a3)...


In 2007–08, seismologists began deploying passive seismic stations over much of the Antarctic ice sheet. These stations routinely log their position by navigation-grade global positioning system (GPS) receivers. This location data can be used to track the stations situated on moving ice. For stations along the traverse from Zhongshan station to Dome A in East Antarctica and at the West Antarctic Ice Sheet divide the estimated velocities of the ice surface based on positions recorded by navigation-grade GPS are consistent with those obtained by high-accuracy geodetic GPS. Most of the estimated velocities have an angle difference of <28° with the steepest downhill vector of the ice surface slope at the stations. These results indicate that navigation-grade GPS measurements over several months provide reliable information on ice sheet movement of ≥1 m yr-1. With an uncertainty of ~0.3–1 m yr-1, this method is able to resolve both very slow ice velocities near Dome A and velocities of >100 m yr-1 on Thwaites Glacier. Information on ice velocity at three locations for which no data from satellite-based interferometric synthetic aperture radar are available have also been provided using this method.


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Antarctic ice velocities from GPS locations logged by seismic stations

  • Meijian An (a1), Douglas Wiens (a2), Chunlei An (a3), Guitao Shi (a3), Yue Zhao (a1) and Yuansheng Li (a3)...


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