| 研究生: |
杜文斌 Wen-Pin Tu |
|---|---|
| 論文名稱: |
南海最北部地磁與地形之研究 |
| 指導教授: |
許樹坤
Shu-Kun Hsu |
| 口試委員: | |
| 學位類別: |
碩士 Master |
| 系所名稱: |
地球科學學院 - 地球物理研究所 Graduate Institue of Geophysics |
| 畢業學年度: | 90 |
| 語文別: | 中文 |
| 論文頁數: | 121 |
| 中文關鍵詞: | 地形 |
| 相關次數: | 點閱:22 下載:0 |
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福爾摩沙峽谷附近被認為是古琉球與馬尼拉海溝間轉形斷層(transform fault)的位置,而過去有關於福爾摩沙峽谷較詳細的資料僅限於走向為N90°東邊的這一段。本研究利用最近在南海最北部區蒐集的磁力及水深資料,搭配舊有的水深及磁力資料,試圖釐清古馬尼拉-琉球隱沒帶間的轉形斷層真相,並探討研究區域的地殼特性。 在磁力資料方面,我們將新蒐集的磁力資料修正後得到磁力異常值,再與舊有的磁力資料整編成南海最北部的磁力異常資料。並利用增強解析訊號及增強尤拉解迴旋法分析磁力異常值,以求得磁源可能的位置及深度。磁力資料經過處理、分析後,我們可以確認出數條東西向的條帶,應為南海海洋地殼向北的延伸。且在此區也發現數條南北向的破裂帶。在水深資料方面,先將所蒐集的水深資料與ACT資料作比對,扣掉平均誤差值後,整編這兩筆水深資料,加上舊有的水深資料編整成南海最北部的水深資料。由水深資料我們知道,福爾摩沙峽谷有兩段走向不同的區間,在地形上有很大的差別。在走向為N135°的西邊這一段,峽谷南北兩側落差可達300多公尺,在地形上來看幾乎成一個Z字形,這應該不是一個典型峽谷會呈現的現象,所以我們認為在走向為N135°這一段應該是一個斷崖(escarpment),是古轉形斷層的遺跡,峽谷應是沿著古轉形斷層,而走向N90°東邊的這一段則可能是大陸與海洋地殼邊界。
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葉一慶 (2001) 南海東北部海洋地殼構造之研究,國立中央大學地球物理研究所碩士論文共94頁。