The mass balance of large ice sheets is controlled by the dynamics
of fast moving ice streams and outlet glaciers. In this work, I use
geodetic and passive seismic observations to constrain rates of
change in the flow of ice streams and illuminate fundamental
processes that govern their behavior. An investigation of the flow
field near the onset of Bindschadler Ice Streams reveals that the
ice stream onset location is presently stable. Using passive
seismic observations to monitor subglacial processes on MacAyeal
Ice Stream, a set of harmonic glacial tremors were observed. The
tremors are characterized by the sustained arrival 3 Hz energy for
over 10 minutes, during which the source location migrates. The
duration, monochromatic nature, and movement indicate the source
mechanism is transient flow in the subglacial water system. A
detailed investigation of the stick-slip motion on Whillans Ice
Stream is undertaken using detailed GPS observations of the surface
velocity. These observations reveal that most aspects of stick-slip
motion are modulated by the tides of the Ross Sea. The tides affect
ice stream by introducing rates in which stress is accumulated
during the time periods between slip events.
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