摘要
地震層析法是探討不同尺度三維波速構造的重要工具之一。本研究是利用地震資料來求取呂宋島弧至台灣西南部海域間的三維震波速度構造,藉以了解此區域的三維速度分佈,並探討其在地體構造上的意義。
由本研究所獲得之速度構造顯示，大體上P波速度構造呈南北走向，且顯示向東下傾的高速帶和低速帶間隔排列。在澎湖群島及蘭嶼所在之呂宋島弧底下於地表附近有較高的P波波速，可能與這些區域有火成岩存在有關。而中央山脈東側上部地殼的速度變化亦為高區， 其位置對應於布蓋重力異常高區，可能是由於菲律賓海板塊岩石圈物質的加入所影響。西部嘉南平原對應於地表附近的低波速帶和低重力異常帶，可能是反應很厚的沉積層。比較地形剖面圖和南北走向之高速及低速帶可知，隨緯度的增加(即愈往北走)，台灣島會相對於其下方之岩石圈向東移動。經過與菲律賓海板塊隱沒的位置比對，可知菲律賓海板塊隱沒得愈深，在其向西北移動時地表物質隨其運動的量愈小，亦即造山運動是在菲律賓海板塊開始向北隱沒時最為激烈。

目錄
摘要………………………………………………………………… i
致謝………………………………………………………………… ii
目錄………………………………………………………………… iii
圖表目錄…………………………………………………………… v
第一章　緒論…………………………………………………..…… 1
第二章 資料及研究方法……………………………………..….... 5
2.1 資料蒐集與處理……………………………………..…... 5
2.2 研究方法……………………………………………....... 10
2.2.1 地震層析法…………………………………..... 10
2.2.2 棋盤式檢驗………………………………..…... 14
2.2.3 重力方法…………………………………..…... 16
第三章 結果與討論…………………………………………..…… 17
3.1 研究結果………………………………………..……… 17
3.2 解釋與討論………………………………………..…… 18
3.2.1 Vp分佈…………………………………….….. 18
3.2.2 密度分佈…………………………………….… 19
第四章　結論………………………………………………….…… 25
參考文獻…………………………………………………….……… 26

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