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    Please use this identifier to cite or link to this item: http://ir.cnu.edu.tw/handle/310902800/2591

    標題: 台灣板塊邊界觀測研究 (II)-台灣西部三分量井下應變儀觀測研究(II)
    作者: 李民
    貢獻者: 產業安全衛生與防災研究所
    關鍵字: 井下型地殼應變儀
    borehole type strainmeter
    earth tide
    long term stability
    meteorological effect II
    日期: 2007
    上傳時間: 2008-07-31 16:51:22 (UTC+8)
    出版者: 台南縣:嘉南藥理科技大學產業安全衛生與防災研究所
    摘要: 由於井下型地殼應變儀之直徑約僅十公分,可能對地下水文之變化會比較敏感;文獻
    號顯示台灣西部麓山帶安裝的十二具井下地殼應變儀確實可量測微小至10-9 的地殼應變
    秋兩季是暴雨及颱風季節,自2004 年初至2008 年中共有29 個颱風侵襲或掠過台灣。颱風
    GTSM strainmeters have been deployed at 12 sites in western Taiwan since the end of 2003. The
    earth tidal signals useful for in-situ calibration of the instrument response are clearly seen in all
    channels at each site. This fulfills the first requirement concerning instrument performance, i.e.,
    with high sensitivity to the crustal strain, when strainmeter was selected as one of the major
    components in the integrated project.The long-term stability of the instrument is the second
    requirement concerned. In the laboratory, the GTSM strainmeter has long-term stability of better
    than one nanostrain per year if the distressing is properly performed. In the field, one example of
    installation of a standard instrument in a relatively arid and stable tectonic region in Australia has
    demonstrated that a long-term stability of much better than 100 nanostrain per year, so that
    observation of long-term strain rates in tectonic regions larger than this will be robust. However,
    there is evident that dilatometers in Iceland have been strongly influenced by aquifer pore
    pressure change. Another meteorological effect to be considered is the influence of atmospheric
    pressure on measured strain. Effects from change of either pore pressure or atmospheric pressure
    must be understood if the tectonic strain is to be understood. There have been 29 recorded
    typhoons attacked or swept this island since the first GTSM strainmeter was deployed in the end
    of 2003. Typhoons were usually accompanied by heavy rainfall and significant atmospheric
    depression which had left their effects on the continuously recorded strain data at each site.
    Groundwater level change initiated by rainfall seems to be the major cause that is responsible for
    the observed strain anomalies. This crustal strain measurement project has deployed a piezometer
    at tens of meters above the co-site strainmeter at nine sites, this will be able to use the pore
    pressure measurements to define repeatable strain responses to pore pressure change that can be
    used to correct the strain data.
    關聯: 計畫編號:NSC96-2116-M-041-004
    Appears in Collections:[職業安全衛生系(含防災所)] 國科會計畫

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