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Geodetic and seismic observations of ice-stream dynamics.

机译：冰流动力学的大地和地震观测。

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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.
机译：大冰盖的质量平衡由快速移动的冰流和出口冰川的动力学控制。在这项工作中，我使用大地测量和被动地震观测来限制冰流的变化速率，并阐明控制其行为的基本过程。对Bindschadler冰流开始附近的流场的研究表明，冰流开始位置目前是稳定的。使用被动地震观测来监测MacAyeal冰河流下的冰下过程，观察到一组谐波冰河震颤。震颤的特征是持续10分钟持续到达3 Hz能量，在此期间震源位置发生迁移。持续时间，单色性质和运动表明源机制是冰下水系统中的瞬时流动。使用表面速度的详细GPS观测资料，对Whillans冰河上的粘滑运动进行了详细研究。这些观察结果表明，粘滑运动的大多数方面都受到罗斯海潮汐的调节。潮汐通过引入滑移事件之间的时间段内应力累积的速率来影响冰流。

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