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作者:翁筱彤
作者(外文):Siao-Tong Wong
論文名稱:利用噪訊成像探討澎湖群島淺層地下速度構造
論文名稱(外文):The shallow subsurface velocity structures in Penghu Islands using Ambient Noise Tomography
指導教授:郭陳澔
學位類別:碩士
校院名稱:國立中央大學
系所名稱:地球科學學系
學號:107622006
出版年:108
畢業學年度:107
語文別:中文
論文頁數:84
中文關鍵詞:周遭噪訊澎湖群島層析成像
外文關鍵詞:ambient seismic noisesPenghu IslandsTomography
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澎湖群島位在臺灣海峽,處於歐亞板塊東南邊緣的淺水區(< 100米深)。以前在此區的地球物理研究主要以整個臺灣海峽為主體,較少有以澎湖為目標的分析。因此這次的研究,將要利用噪訊成像反演澎湖群島的淺層剪力波速度構造。本研究於2015年5月至2015年6月在澎湖及其周圍佈放了125個單分量短週期的Texan儀器,從測站對的連續紀錄中重建兩測站之間的雷利波經驗格林函數,並使用多重濾波法以及影像轉換技術得到群速度以及相速度頻散曲線,相速度可信賴週期大約落在0.6-4.6秒,最後以相速度頻散曲線,反演波線的一維平均速度分佈得出剪力波速度構造。從速度構造結果顯示在西嶼、白沙島及澎湖本島和島嶼間的海灣,在短週期中島嶼速度相對較快,海灣速度相對較慢;在長週期中島嶼的速度則是相對較慢,而海灣則相對較快,反應出此區深部可能有受到火成岩的影響。
The Penghu Islands are located on the southeastern edge of the Eurasian plate in the Taiwan Strait. Previous geophysical studies mainly focused on the entire Taiwan Strait, but did not only target to the Penghu Islands as a research area. However, there are some geological variations in the Penghu Islands deserved for more detailed studies. In this study, I will use ambient noise to invert the shear wave velocity structure in the Penghu Islands for the first time. We deployed 125 Texan instruments from May to June 2015. The Rayleigh wave empirical Green's function between the two stations is reconstructed from the continuous record of the station pair, and the group velocity and the phase velocity dispersion curve are obtained by using the multiple filter technique and the image transformation technique. Finally, the phase velocity dispersion curve is used to invert the one-dimensional average velocity distribution of the ray path in order to obtain the shear wave velocity structure. As a result, for the short periods of the phase velocities, the velocities beneath the islands (Siyu, Baisha Islands and Penghu Isles) show relatively faster than those beneath the bay areas. However, it is interesting to note that for the long periods of the phase velocities, the velocities beneath the islands are slower than those beneath the bay areas. Based on the well logs and the distribution of magnetic anomalies, the higher velocities beneath the bay areas could be related to the intrusive igneous rocks.
中文摘要 i
英文摘要 ii
誌謝 iii
圖目錄 vii
表目錄 x
第一章、緒論 1
1-1、 研究動機與目的 1
1-2、 本文架構 3
第二章、研究區域地質背景 7
2-1、區域地形及地質 7
2-2、區域地體構造 8
2-3、文獻回顧 9
2-3-1、震測研究 9
2-3-2、噪訊層析成像 10
2-3-3、重力磁力 12
第三章、理論背景與研究方法 33
3-1、周遭噪訊互相關函數 33
3-2、理論背景 33
3-3、野外儀器設備及施測 35
第四章、資料分析與結果 40
4-1、資料預先處理 40
4-2、互相關函數計算與疊加 40
4-3、資料篩選 41
4-4、測量頻散前處理 41
4-5、表面波頻散分析 42
4-5-1、群速度頻散分析-多重濾波法 42
4-5-2、相速度頻散分析-影像轉換技術 43
4-5-3、結果篩選 44
4-6、噪訊層析成像 45
4-6-1、建構反演矩陣 45
4-6-2、棋盤格測試 46
4-6-3、反演結果 46
第五章、結果與討論 59
5-1、相速度頻散曲線 59
5-2、臺灣海峽噪訊成像 59
5-3、重力磁力 60
5-4、地下地質 60
第六章、結論 65
參考文獻 66

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