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- W2019988158 abstract "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. We 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)." @default.
- W2019988158 created "2016-06-24" @default.
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- W2019988158 date "2009-12-01" @default.
- W2019988158 modified "2023-10-14" @default.
- W2019988158 title "Free and forced polar motion and modern observations of the Chandler wobble" @default.
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- W2019988158 doi "https://doi.org/10.1016/j.jog.2009.09.028" @default.
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