博碩士論文 100682004 詳細資訊




以作者查詢圖書館館藏 以作者查詢臺灣博碩士 以作者查詢全國書目 勘誤回報 、線上人數:12 、訪客IP:44.201.99.222
姓名 羅祐宗(Yu-tsung Lo)  查詢紙本館藏   畢業系所 地球科學學系
論文名稱 結合重力與地震資料探討台灣地區之地殼構造
(Joint gravity and seismic data to investigate the tectonic of Taiwan)
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摘要(中) 重力觀測是用來探索地下構造的優先方法之一。因為它具有方便、快速、低成本的優勢,目前台灣遍布密集的重力觀測點,提供完整的重力觀測資料。本研究分析觀測重力值內包含的訊息,利用g-H關係圖法及Nettleton密度剖面法進行地表岩層密度的估算,其結果能與地質分區對應一致。根據分析結果指出,山區的密度分布約2.4至2.6 g⁄〖cm〗^3 ,西部麓山帶約2.2 g⁄〖cm〗^3 ,西部平原約1.8至2.0 g⁄〖cm〗^3 。經過重力修正得到布蓋異常圖並分析重力效應的波長,將重力效應分為淺層及深層的來源,進行莫荷面的估算及地下密度分布的討論。經訊號分離後的淺層重力效應能與地質分區對應一致;深層的重力效應圖顯示在西部麓山帶下方有一重力低區,推測與地殼增厚有關。我們利用速度-密度經驗轉換公式,將速度構造與重力觀測合併來討論,並分別討論淺層和深層的速度構造與重力效應的異同。透過分析比較,我們可以知道兩者之間仍存在明顯差異。本研究採用二維聯合模擬的方法,彙整TAIGER、ATSEE及TSEE的地震資料及整合後的重力資料進行三條二維剖面的順推計算工作,得到符合走時與重力觀測的二維構造,並加入利用重力資料所求得大尺度的莫荷面深度起伏,可作為未來進行更精細的三維地下構造模擬之初步模型。
摘要(英) Gravity observation is one of priority method that used to explore the subsurface structure. Because it is easy, fast and low-cost, dense gravity observation stations are distributed in whole Taiwan, no exception in mountain area. In this study, the message contained in the observation of gravity values is analyzed. We use g-H relationship and Nettleton′s density determination method to estimate the density of topography. Based on the results, the density value of mountain area ranges from 2.4 to 2.6 g⁄〖cm〗^3 , is 2.2 g⁄〖cm〗^3 in Western Foothills and 1.8 to 2.0 g⁄〖cm〗^3 in Western plains. After gravity correction, we can get Bouguer anomaly value and separate the source of gravity effect to the shallow and deeper part from gravity wavelength. Then, it led to discuss the Moho interface relief and subsurface density distribution. The shallow gravity effect is consistent with the pattern of geological division. The deeper gravity effect map reveals that the gravity low area is existed beneath Western Foothills, it might relate to crustal thickening. We utilized the empirical relations between elastic wavespeeds and density to analysis the consistency between velocity structure and observation gravity. According to analysis and comparison, there are significant differences between the analytical results of two physical properties observations.
In this study, we begin from two-dimensional co-simulation modeling method using TAIGER, ATSEE TSEE of seismic data and observation gravity data. Then, the theoretical travel time and gravity value is calculated from three two-dimensional cross-sections across northern, central and southern Taiwan. The results of forward modeling that correspond with travel time and observation gravity and large scale Moho interface relief can be use as better initial model of three-dimensional subsurface modeling.
關鍵字(中) ★ 重力
★ 地殼構造
關鍵字(英) ★ Gravity
★ Tectonic
論文目次

目錄 i
圖目錄 v
表目錄 viii
中文摘要 ix
Abstract x
誌謝 xi
第一章 緒論 1
1.1 研究動機與目的 1
1.2 文獻回顧 5
1.3 本文內容 7
第二章 研究區域概述 19
2.1 研究區域介紹 19
2.2 台灣地質分區及地體構造概述 19
2.2.1 台灣主體區 20
2.2.2 恆春半島區 25
2.2.3 台東海岸山脈區 26
2.3 台灣海峽地質概況 27
2.3.1 海峽地貌 27
2.3.2 構造概述 28
2.3.3 地層概況 30
2.4 重力資料蒐集 33
第三章 重力資料處理與重力異常 39
3.1 重力修正 39
3.1.1 緯度修正(Latitude Correction) 39
3.1.2 自由空間修正(Free-air Correction) 40
3.1.3 布蓋修正(Bouguer Correction) 41
3.1.4 地形修正(Terrain Correction) 42
3.2 自由空間與布蓋重力異常 44
3.3 地表岩層密度 45
3.3.1 前人研究方法 45
3.3.2 修正密度決定 48
第四章 台灣與鄰近地區莫荷深度估算 61
4.1 數學方法 61
4.1.1 向上及向下延伸法 61
4.1.2 莫荷面深度計算 63
4.2 模型測試 64
4.3 台灣及鄰近地區莫荷面估算 66
4.3.1 資料來源 66
4.3.2 海水層置換成地殼 66
4.3.3 重力訊號分離及莫荷面估算 67
4.4 台灣地區莫荷面深度分布 69
4.5 重力解析地殼構造討論 69
第五章 速度構造順推與重力資料之比較分析 83
5.1 觀測與理論重力值分析 83
5.2 速度模型順推 85
5.3 模型分層效應分析 86
5.3.1 速度淺層與深層構造之計算重力效應 86
5.3.2 觀測重力淺層與深層效應 88
5.4 小結 89
第六章 結合重力與地震資料探討台灣二維地下構造 99
6.1 資料來源 99
6.2 研究方法 100
6.3 處理流程 105
6.4 二維速度密度構造結果 107
6.4.1 FJ1T6 (北段測線) 107
6.4.2 T5 (中段測線) 108
6.4.3 FJ3T4 (南段測線) 109
6.5 二維構造模型討論 110
6.6 小結 113
第七章 結論 131
參考文獻 135
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顏滄波、羅森本,臺灣大南澳片岩地帶內雲母之鉀氬年代─初步報告,中國地質學會會刊,第7號,第80-81頁,1964。
指導教授 顏宏元(Horng-yuan Yen) 審核日期 2016-5-24
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