臺灣博碩士論文加值系統

本研究利用從IRIS地震資料中心下載之2000年至2012年的垂直向寬頻波形資料，針對南中國海板塊進行表面波頻散分析研究，並進一步推求南海地區三維雷利波群速度構造，探求南中國海板塊區域下雷利波群速度隨深度變化情形。本研究區域為10°S~30°N、90°~130° E，並挑選包含在此區域內18個世界觀測網測站，使波線能均勻地通過南海地區。透過Dziewonski et al.(1969)所提出之多重濾波技術(MFT)，針對雷利波進行頻散曲線分析，最後獲得3288條頻散曲線，並使用Debayle, E. and M. Sambridge (2004)所提出之反演方法，推求南中國海地區於不同週期下的雷利波層析成像及其非均向性，藉由研究所獲得的結果來了解南中國海地區與周遭大地構造的關係與特性，期望能對南中國海的演化歷史有更進一步之了解。結果顯示，於較短週期上所表現出的層析成像，低速區大約符合南海週遭火山島弧的分佈情形，且也能反映出各區域海盆的厚度，此時非均向性所顯示出的方位角大約能代表大地裂隙的方向。而在長週期下的群速度結果，高速約可反映盆地底部的玄武岩質火成岩，且也能夠反映出板塊俯衝帶，低速區則能反映出南中國海盆地的輪廓，而此時的非均向性約能反映出地幔流的方向，方位角與板塊邊界，以及過去所認為的擴張中心垂直。在群速度剖面上，可以在西南海盆、中央海盆內發現過去擴張後所留下的痕跡，以及大陸地殼受到海洋地殼上拱、開裂後，被新形成的海洋地殼覆蓋的現象。綜合以上結果，本研究可對南中國海板塊演化歷史有更進一步的瞭解。

In this research, we calculated the vertical seismic waveform data from the IRIS seismic data center which the period is from 2000 to 2012 to analyze the surface wave dispersion curve and construct the 3D Rayleigh-wave group velocity and azimuthal anisotropy structure beneath the South China Sea (SCS).
The research region is among 10°S-30°N and 10°-130°E, 18 broadband stations were chose in this area that the ray density could cover the SCS. Hence, we adopted the Multiple Filter Technique (MFT) which proposed by Dziewonski et al. (1969) to analyze Rayleigh-wave dispersion curves at periods from 20s to 100s. In this study, we obtained 3288 dispersion curves from the teleseismic data. Finally, we used the inversion method which proposed by Debayle, E. and M. Sambridge (2004) to obtain the tomography and azimuthal anisotropy map.
From the results of short periods, the tomography model exhibited high velocity region which reflects the thickness of the basin and low velocity region that refers to the volcanic island arc around the SCS. By the way, azimuthal anisotropy shows the orientation of crack within the crust. For the long period, the high velocity region reflects the rock characteristic in the bottom of basin and the azimuthal anisotropy exhibits the upper mantle flow direction and the expansion center as well. In addition, the results of vertical profiles also reveal a phenomena that the oceanic crust covered to continental crust beneath the Southwestern basin and Central basin in the SCS. According to the above results, we can learn more about the evolution of the SCS.

目錄
誌謝
中文摘要
Abstract
目錄
圖目錄
表目錄
第1章 緒論
1.1 研究動機與目的
1.2 研究區域地質背景及大地構造
1.3 前人研究及文獻回顧
第2章 資料處理及研究方法
2.1 群速度分析：多重濾波技術 (MFT: Multiple Filter Technique)
2.2 反演程序 (Inversion)
2.3 非均向性
2.4 資料選取
2.5 檢驗板測試(checkerboard test)
第3章 結果與討論
3.1 三維雷利波群速度構造及非均向性反演結果
第4章 三維雷利波群速度剖面及其地體構造上的含義
4.1 三維雷利波群速度剖面
第5章 結論
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