Non-tidal variations in the deflection of the vertical at Beijing Observatory |
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| Authors: | ZX Li H Li YF Li YB Han |
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| Institution: | (1) Shanghai Observatory, Chinese Academy of Sciences, Shanghai, 200030, China;(2) Institute of Seismology, China Seismological Bureau, Wuhan, 430071, China;(3) National Observatory, Chinese Academy of Sciences, Beijing, 100012, China |
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| Abstract: | At Beijing Observatory both astrometric and gravimetric observations are available to study the non-tidal variations in the deflections of the vertical (or non-tidal plumbline variations, PLVs). From repeated gravimetric observations performed in a network around the observatory, the PLVs at Beijing Observatory during the period 1987.0–1996.0 have been calculated. After comparison with the observational residuals (which also contain the PLV components) of the photoelectric astrolabe located at the observatory, the accuracy of the obtained PLV results has been examined. It is shown that, due to the asymmetry of the gravimetric network, the qualities of the two different PLV components are not equal. The longitude component of the PLV at Beijing has been determined successfully, to be of the order of 0.05 , with a contribution of about 0.02 in the inter-annual time scale. The result for the latitude PLV component is not good enough to draw a conclusion. Although both techniques are able to measure the PLV, the result of the determination depends very much on the availability of observational data. |
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| Keywords: | Astrometry Gravimetry Deflections of the vertical Plumbline variations |
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