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    Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/65216

    Title: 台灣東部二維密度構造之模擬;Modeling of two-dimensional density structures in eastern Taiwan
    Authors: 徐子媛;Hsu,Tzu-yuan
    Contributors: 地球科學學系
    Keywords: 重力;密度構造;gravity;density structure
    Date: 2014-07-30
    Issue Date: 2014-10-15 14:43:41 (UTC+8)
    Publisher: 國立中央大學
    Abstract: 台灣位於歐亞大陸板塊與菲律賓海板塊間構造交界上,菲律賓活動帶的北端終點,其花東縱谷與海岸山脈為擠壓呂宋島弧的增生部分和呂宋弧前所形成。花東縱谷是一構造板塊碎屑和火山入侵的複雜集合地區。此外,花東地區附近有明顯正的重力異常分布,並顯示最大布蓋重力異常值。本研究中,我們使用重力正推及逆推的方法在花東縱谷附近的玉里地區來調查地下構造。
    ;Taiwan is located on the tectonic boundary between the Eurasian Plate and the Philippine Sea Plate. The northern terminus of the Philippine Mobile Belt is in Taiwan, where accreted parts of the Luzon Arc and Luzon forearc form the Huatung Longitudinal Valley and the eastern Coastal Range of Taiwan, respectively.
    The Huatung Longitudinal Valley is a complex collection of tectonic plate fragments and volcanic intrusions. Besides, the distribution of the positive gravity anomalies is in the vicinity of Huatung area and there show the maximum value of the Bouguer gravity in this area. In this study, we use the gravity forward and inversion method to investigate a geological profile in Yuli area of the Huatung Longitudinal Valley.
    In order to derive the reliable density structure, we examine several geophysical and geological profiles using the Bouguer anomaly value along each profile. In modeling of subsurface density structure, available seismic and well data are used to possibly constrain the geometric and/or densities. The effect of two-dimensional density model is calculated using the Talwani technique. Then, we use tried and error method to modify the model and finally get a reliable density structure that conform with observed gravity data.
    The locations of strata and faults in this area are obtained by gravity modeling. Moreover, the result shows that the depth of Moho beneath the Coastal Mountain Range is about 10 km and the upper crust was uplift and became anticline beneath the Central Mountain Range. In short, because Philippine Sea plate collision to the Eurasian plate, the distribution of the Bouguer anomaly is increasing eastward from the Central Mountain Range to eastern Taiwan offshore and the highest gravity anomalies in Taiwan, and there are folds beneath the Central Mountain.
    Appears in Collections:[地球物理研究所] 博碩士論文

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