| 研究生: |
吳文男 Wen-Nian Wu |
|---|---|
| 論文名稱: |
台灣北部地區之隱沒樣貌 |
| 指導教授: |
馬國鳳
Kuo-Fong Ma |
| 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: | 89 |
| 語文別: | 中文 |
| 論文頁數: | 92 |
| 中文關鍵詞: | Sp轉型波 、隱沒帶 、班氏帶 |
| 相關次數: | 點閱:9 下載:0 |
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經由分析,TWS1與NCU0是本研究中收到相對較多Sp轉型波記錄的兩個測站,而位於隱沒的菲律賓海板塊西側的NCU0測站亦出乎意料地發現為數不少的Sp轉型波存在。此外,TAP1、TAP0、TWB1等三個測站也是相當容易發現Sp轉型波的測站。本研究中發現直達S波與Sp轉型波的相對走時差約在4到10秒間,相對走時差與震央距成一正比關係,但並不與震源深度成正比關係。
由觀測的直達S波與Sp轉型波的相對走時差,我們描繪出菲律賓海板塊約從北緯24.6∼24.7度之間,在深度40至50公里處約以20度的傾角開始平緩隱沒,到了北緯24.9度傾角增為30度,而過了北緯25.1度後到達深度約70公里,之後似乎以更傾斜的角度隱沒,不過由於在此深度之後本研究並沒有獲得轉型點資料,也因此無法判斷隱沒的菲律賓海板塊在此深處是否存有一轉折。另外,菲律賓海板塊似乎有因邊磧拆層作用在隱沒淺處造成板塊拆層分裂現象。本研究由各分群的平均走時剩餘估算,轉型深度平均總誤差小於10公里,其中當波傳方向接近東西向時,會因速度構造的側向不均性造成較大誤差。
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