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    Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/5397

    Title: 楔形模型之表面波頻散曲線分析研究
    Authors: 郭昱鴻;Yue-Hong Kuo
    Contributors: 地球物理研究所
    Date: 2001-07-12
    Issue Date: 2009-09-22 09:53:13 (UTC+8)
    Publisher: 國立中央大學圖書館
    Abstract: 利用二維物理模型模擬地層構造,在於可利用已知的參數建立模型並在推估時我們有明確數據做準確推演的依據,而表面波會反應不同的地層特性,因此我們可利用其特性探討其相互關係;前人已對表面波和表層構造有基礎的研究,及對表面波跟表層厚度的關係已對於表面波的頻散(dispersion)效應做初步的研究。本研究在於利用二維物理模型模擬不同深度之表層,進而研究表面波的頻散作用和表層厚度的關係,希望藉由物理模型的模擬經分析比較是否能和野外震測結合。 本研究利用二維物理模型模擬不同深度之表層並選擇物理特性適合的材質作為模型製作的材料,以傾角為三度之直角三角形及另一具不等深度之階梯形壓克力板作為表層的材質,並將壓克力板接合在鋁板上,且以鋁板模擬半空間基盤;將震源置於壓克力板邊緣,並以分析表面波(雷利波)的頻散曲線,期望找出衰減及速度和厚度變化是否有關係。 由研究結果顯示,表面波波長與表層厚度比及速度有其相關性,尤其群速變化較相速有較佳集中性,因此我們利用群速與表面波波長及表層厚度比作為回歸及推估表層厚度之參考依據。 In this study we used 2-D wedge Plexiglas overlaying aluminum model to simulate superficial dip layer and to analyze dispersion curves of the surface waves for eudiometry the thickness of the overburden layers . The model used Plexiglas to simulate superficial layer then aluminum to simulate half-space of bed rock. . We use dispersion curve to find somewhat reciprocity between depth and velocity in different frequency of surface wave in this experiment. In the other hand, we have a test on field. We found that : 1. The energy decreases linearly with increase distance between source and reciver. 2.The group velocity to the ratio of wavelength to overburden depth can be decried by the falling empirical formula Vgroup=a(λ/h)-1+b. The velocities change sharply on the ratio of wave- length to depth in the range 3-5.
    Appears in Collections:[地球物理研究所] 博碩士論文

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