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    Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/5453

    Title: 利用衛星大地測量資料研究觸口斷層系統之活動構造;Numerical Modeling of Active Structures of The Chukou Fault System with GPS data
    Authors: 黃思敬;Szi-Ching Huang
    Contributors: 地球物理研究所
    Keywords: 順推;逆推;數值模擬;同震變形;瑞里地震;觸口斷層;彈性半無限空間;Burgers vector;Angular dislocation;GPS;Poly3Dinv;Poly3D;Forward Modeling
    Date: 2005-07-08
    Issue Date: 2009-09-22 09:54:19 (UTC+8)
    Publisher: 國立中央大學圖書館
    Abstract: 本研究利用台灣西南部的GPS(Global Positioning system)觀測資料,配合地下地質資料來建構三維地下構造模型。研究的原理為在彈性半空間中位移錯動模型計算某區域之應力、應變量(Okada, 1985),由地表觀測資料以及前人之研究推論數值模擬所需之斷層參數,包括應變率、楊氏係數、泊松比、剪力係數及拉梅常數等參數,計算斷層在地表下的運動並估計其可能造成之應力、應變型態,並與地表地形比較分析,求得較為正確的地下構造及地表變形模型。 台灣西南部九芎坑斷層、觸口斷層附近已有前人由構造解釋以及平衡剖面的方式提出地下構造模型(Hung et al., 1999)。此地下構造模型剖面顯示逆衝斷層兼具有滑脫面並沿著早期正斷層的淺部滑動。而相同的地表或地質資料將可以有不同的褶皺-斷層型態解釋,而斷層滑離面的位置及深度對此有相當大的影響。本研究希望以數值模擬的方式,利用前人所提供地下構造的數據建構三維的地下構造模型,數值模擬程式是Poly3D,利用Okada在1985年所提出的彈性錯動理論,以推估九芎坑斷層、觸口斷層與所造成地表變形的程度並予實際情況互相比較驗證,以確立地下構造的形貌,同時瞭解地表地殼變形形式與地下斷層構造的運動型態、速率之間的關係。 GPS (Global Positioning System) data are used to construct three-dimensional underground structural model with geological information. Before calculating the dislocation, stress and strain field on the fault surface and the displacement on the surface of the earth, we need to collect the parameters including GPS data, strain rate, Young’s modulus, Poisson’s ratio, shear modulus and Lame constant. Comparing the real and calculated displacement will help us to find the better solution for the modeling result. There were some studies about Chukou fault and Chiusiungkeng fault which are located in southwestern Taiwan, including the structural explanations and balance cross-section ( Hung et al., 1999). We build the simplified Chukou fault system models based on the cross-section, and the parameters of the models are taken into the computer programs named Poly3D and Poly3Dinv to do the forward and inversion modeling. By adjusting the fault geometry, geological parameters and smoothing coefficients, we can test the fault models and find the best result. In this research, we find the best result is shown when the dip angles of Chukou and Chiusiungkeng fault are 65°and 45°, when the smoothing operator is 0.05. With this setting, the strongest dislocation on the surface of fault plane caused by Reili earthquake is located on the depth about 6 km which is similar to the focal mechanism.
    Appears in Collections:[地球物理研究所] 博碩士論文

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