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    Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/68395

    Title: 全球隱沒帶的板塊撓曲量模擬和地震活動相關性分析
    Authors: 林子峻;Lin,Zi-Jun
    Contributors: 地球科學學系
    Keywords: 板塊撓曲;板塊邊界;耦合;地震數目;板塊年紀;隱沒速度
    Date: 2015-08-31
    Issue Date: 2015-09-23 11:31:12 (UTC+8)
    Publisher: 國立中央大學
    Abstract: 海洋板塊岩石圈在隱沒過程中,會因為荷重而產生撓曲,並在隱沒帶外側形成地形上的局部高區,通常被稱為海溝外側隆起帶 (outer-rise),而板塊撓曲程度 (flexural deflection) 通常跟海洋板塊所受到的應力狀態有關。另一方面,隱沒帶板塊邊界間的應力狀態,不僅與海底地形分佈相關,也會影響到板塊的耦合程度,造成不同程度的地震活動。因此,海溝外側隆起帶的形貌應該可以反應出隱沒帶的產震特性。
    ;Near oceanic trenches, the lithosphere is bent by plate stresses, including vertical and horizontal load. This bending effect, generally known as plate flexure, causes the formation of the outer rise which is often observed on the bathymetry data. The width of the outer rise is directly related to the flexural rigidity of the lithosphere.
    Moreover, the wavelength and amplitude of this flexure can be used to constrain the state of stress. In a coupled subduction zone, the stress is largely accumulated across the plate boundary which should affect the flexural properties of the subducted plate. Thus, the variation of the outer rise in shape may reflect the seismogenic characteristics of the subduction system. In this study, we estimate the flexural parameters of subducted plate based on the available bathymetry data. The values of the flexural deflection (Wb) are between 100 and 700 m. Their average value spreads from 348 to 682 m. The worldwide distribution of Wb shows that relatively larger values occur in the center of the trench system. The standard variation of Wb is generally larger in the weak coupling subduction system than in the strong coupling area.
    The comparison of Wb and several parameters of the subduction system shows that the Wb is correlated to the number of earthquakes with magnitude between 5 to 7. Otherwise, no clear correlation was found between Wb and other parameters.
    Appears in Collections:[地球物理研究所] 博碩士論文

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