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Free and forced polar motion and modern observations of the Chandler wobble

机译:自由和强迫极运动以及钱德勒摆动的现代观测

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摘要

In the absence of excitation, the Chandler wobble is closely a prograde motion along a circular arc. For a step excitation, the centre of the arc shifts, giving a secular motion but an equal and nearly opposite contribution to the Chandler wobble occurs, giving only a second order discontinuity in the pole path. To detect excitation events, we fit circular arcs by least squares to the unequally spaced data, weighting by the inverse of the square of the accompanying standard errors. A break is determined if extrapolation along the circular arc leads to a forecast pole position for which the next measured position lies outside a circle of acceptance.rnWe find that often for quite long periods of time, there seems to be relatively little continuous excitation, leading to the conclusion that much of the excitation comes from sudden events. In particular, we are encouraged that a break in the pole path was found 11 days before the December 26, 2004 Sumatra-Andaman Islands earthquake (M = 9.1).
机译:在没有激励的情况下,钱德勒摆动几乎是沿着圆弧的前进运动。对于阶跃激励,弧的中心移动,进行了长期运动,但对钱德勒摆动产生了相等且几乎相反的作用,从而在磁极路径中仅给出了二阶不连续性。为了检测激发事件,我们对不等距数据拟合了最小二乘的圆弧,并按随附标准误差的平方的倒数进行加权。如果沿圆弧的外推会导致预测的极点位置(下一个测得的位置位于接受圆之外),则确定是否中断。rn我们发现通常在相当长的一段时间内,连续激励似乎很少,导致得出的结论是,许多激励来自突发事件。尤其值得鼓舞的是,在2004年12月26日苏门答腊-安达曼群岛地震(M = 9.1)发生的第11天,发现极线发生了断裂。

著录项

  • 来源
    《Journal of geodynamics》 |2009年第5期|226-229|共4页
  • 作者

    Doug E. Smylie; Midhat Zuberi;

  • 作者单位

    Department of Earth and Space Science and Engineering, York University, 4700 Keele Street, Toronto, Ontario, M3J 1P3 Canada;

    Department of Physics and Astronomy, York University, 4700 Keele Street, Toronto, Ontario, M3J 1P3 Canada;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    VLBI; spectral analysis; pole path;

    机译:VLBI;光谱分析极路径;

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