由雷利波頻散資料推研台灣中央山脈之上部地函速度分佈

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姓名

陳建志(Chih-Chien Chen) 查詢紙本館藏

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地球物理研究所

論文名稱

由雷利波頻散資料推研台灣中央山脈之上部地函速度分佈

相關論文

★ 臺灣地區地殼速度層析及非均向性研究	★ 由短週期表面波頻散資料研究臺灣西南部淺層速度分佈
★ 台灣中西部地區之強震特性	★ 利用線形地震網探討台灣南部主要構造
★ 由洛夫波頻散資料探討中國大陸岩石圈之三維剪力波速度分佈	★ 菲律賓海板塊高解析剪力波速度影像和非均向性研究
★ 由雷利波頻散資料推研台灣海峽之地殼及上部地函構造	★ 由表面波資料探討台灣及鄰近區域之地殼速度側向變化
★ 以交叉對比分析地震的時空分佈行態

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摘要(中)

本研究利用雙站法推求雷利波穿越TATO-TPUB 及TATO-TWKB對測站間的速度頻散，藉以探討台灣中央山脈附近的地殼厚度及上部地涵的剪力波速度分佈。資料的來源取自中央研究院地球研究所IES (Institute of Earth Sciences)，於1996年起陸續設置在台灣地區之寬頻地震儀BATS (Broadband Array in Taiwan for Seismology)所記錄的。測站大圓上之遠地地震，方位角的誤差在5度以內。速度頻散的週期介於15至95秒間。這些頻散資料經多次線性逆推後，求得各對測站間的最佳地殼厚度及上部地函之剪力波速度分佈。
結果顯示，TATO-TPUB測線（中央山脈西側部分）的地殼厚度約為40公里。速度分佈方面，因短週期資料不足無法解析上部地殼之速度變化，但下部地殼(17-40公里)之剪力波速度有線性增加的趨勢。莫何(Moho)以下的高速層(40 -65公里)，其剪力波速度均為4.5公里/秒，自65-110公里處均為低速區，其剪力波速度均為4.3公里/秒，自110公里以下，速度則是呈現緩慢增加。TATO-TWKB測線（中央山脈東側部分），結果大致類似，但地殼厚度可能稍厚些，上部地涵中的高速層（莫何下的部分）速度在4.5公里/秒左右，但自65公里以下的速度則較中央山脈西側部分稍低（65-110公里處約為4.2公里/秒，110公里以下部分約為4.3-4.4公里/秒）此現象可能是受到菲律賓板塊擠壓後，此區有較高的熱流值所致。

關鍵字(中)

★ 雷利波
★ 頻散
★ 群速
★ 相速

關鍵字(英)

★ Rayleigh wave
★ Dispersion
★ Group velocity
★ Phase

論文目次

摘要……………………………………………………………………………i
誌謝……………………………………………………………………….…..ii
目錄……….…………………………………………………………….……..iii
圖表目………………………………………………………………..………..iv
第一章緒論…………………………………………………………….1
1.1 研究動機與目的…………………………………………...……….1
1.2 文獻回顧…………………………………………………..………..3
1.3 本文內容…………………………………………………..………..4
第二章台灣地區地質概況及板塊構造特徵.…………………5
2.1 地質概況……………………..……………………………………5
2.2 台灣地震分佈特徵…………..……………………………………8
2.3 台灣地區造山運動過程.………………..………………..……….11
2.4 重力資料之分析解釋…………..….……………………..……….16
第三章觀測網的地震資料選取原則……………………………19
3.1 地震觀測網演進……………………………………………………19
3.2 地震資料選取原則…………………………………………………22
第四章研究方法及資料分析…………………………………...…27
4.1 表面波分析方法…..……………………………………………....27
4.1.1 單站法……………………………………………………..….27
4.1.2 雙站法…………………………………………………..…….27
4.2 資料分析流程…………………………………………….…..…….28
4.3 相速及群速分析……………………………………………….…...37
4.3.1相速度分析……………………………………………...….....37
4.3.2群速度分析……………………………………………..…......42
4.3.3多重濾波法……………………………………………..……..43
4.3.4相位匹配濾波…………………………………………..……..56
4.4逆推原理…………………………………………………….……….66
第五章結果解釋與討論……………………………….….………..70
5.1逆推過程………………………………………………………...70
5.2 討論………………………………………………………………82
第六章結論............................................................................89
參考文獻………………………………………………………………….…90
洛夫波頻散（附錄一）…………………………………………………....95
BATS資料選取流程（附錄二）…………………………………….98

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指導教授

余貴坤(Guey-KuenYu)

審核日期

2002-7-18

推文