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Layered Cartesian half-space models for Earth's elastic response to contemporary surface loading phenomena.

机译：分层笛卡尔半空间模型，用于地球对当代表面载荷现象的弹性响应。

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摘要

Postglacial rebound (PGR) represents a complicated interplay of the solid Earth and ice history, through which scientists can investigate past climate changes. During the past decades, the advancement of spatial technology significantly enhanced scientists' capability to observe PGR signals. However, in many glacial regions of the world, PGR signals are contaminated' by vertical elastic crustal deformation, which is induced by present ice mass change.; In order to estimate the magnitude and pattern of the elastic crustal deformation, a layered elastic loading model has been developed in this dissertation work. It is capable of computing surface deformation due to an arbitrary shape load. The high-speed computing capability of this model provides us possibilities to investigate elastic properties of the Earth's crust in detail.; This elastic loading model is applied to the Patagonia ice field to eliminate elastic rebound signal due to present ice loss. Using different combinations of ice loss models and Earth's elastic structures, we estimated that the present ice loss contributes 5-25% to the total crustal uplift. In addition, we used geodetic measurements to further confirm that the broad pattern of uplift in the Patagonia region reflects the Earth's response to the deglaciation of the Little Ice Age (LIA) rather than that of the Last Glacial Maximum (LGM), due to the unique tectonic setting of this region.; The Inverse Bousinessq Response (IBR) effect observed by the strainmeters in California is also explained by numerical modeling using the layered elastic loading model. High Poisson's ratio and strong stiffness contrast of the crust's soft and hard sediment layers play an important role in the IBR's occurrence. The thickness of the soft sediment layer controls the location and spatial extent of the IBR effect.; In Greenland, we used the elastic loading model and the most complete estimate of ice mass change (1993-2000) to demonstrate that by using continuous GPS measurements, we can detect and assess ice loss acceleration in Greenland faster than by using other geodetic tools.
机译：冰川后反弹（PGR）代表了固体地球和冰历史的复杂相互作用，科学家可以通过该过程调查过去的气候变化。在过去的几十年中，空间技术的进步显着增强了科学家观测PGR信号的能力。然而，在世界上许多冰川地区，PGR信号受到垂直弹性地壳变形的污染，而垂直弹性地壳变形是由当前冰量变化引起的。为了估算弹性地壳变形的大小和形式，本文建立了分层的弹性载荷模型。它能够计算由于任意形状载荷而引起的表面变形。该模型的高速计算能力为我们提供了详细研究地壳弹性特性的可能性。该弹性加载模型应用于巴塔哥尼亚冰场，以消除由于当前冰流失而产生的弹性回弹信号。使用冰损失模型和地球弹性结构的不同组合，我们估计目前的冰损失占整个地壳上升的5-25％。此外，我们使用大地测量来进一步确认，巴塔哥尼亚地区隆起的广泛模式反映了地球对小冰期（LIA）而不是上一次冰河极大期（LGM）的冰川消融的响应。该地区独特的构造环境。加利福尼亚州的应变仪观察到的Bousinessq响应反演（IBR）效应也通过使用分层弹性载荷模型的数值模拟来解释。地壳软硬沉积层的高泊松比和强刚度对比在IBR的发生中起重要作用。软质沉积层的厚度控制着IBR效应的位置和空间范围。在格陵兰岛，我们使用弹性加载模型和最完整的冰块变化估计值（1993-2000年）来证明，通过使用连续的GPS测量，我们可以比使用其他大地测量工具更快地检测和评估格陵兰岛的冰流失加速。

著录项

  • 作者

    Zhou, Hao.;

  • 作者单位

    The Ohio State University.;

  • 授予单位 The Ohio State University.;
  • 学科 Geology.
  • 学位 Ph.D.
  • 年度 2008
  • 页码 178 p.
  • 总页数 178
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 地质学;
  • 关键词

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