Title page for 86224010


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Student Number 86224010
Author Jing-Yi Su(蘇敬怡)
Author's Email Address No Public.
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Department Graduate Institute of Geophysics
Year 1999
Semester 2
Degree Master
Type of Document Master's Thesis
Language zh-TW.Big5 Chinese
Title A Study of Local Site Effect on the Lan-Yang Plain by using S Waves and Coda Waves
Date of Defense 2000-07-01
Page Count 81
Keyword
  • coda wave
  • Lan-Yang Plain
  • S wave
  • site effect
  • Abstract This study used the near and far field data recorded by the Taiwan Strong Motion Instruments Program (TSMIP) of CWB (Central Weather Bureau). We used the Spectrum Ratio to calculate each site amplification coefficient between a reference rock site and each soil site of the Lan-Yang Plain from Fourier spectrum of S waves and Coda waves. The relationship between the site effect factor of S and Coda waves and surface geology in different areas was analyzed in this study.
    The data used were recorded by the TSMIP accelerographs of CWB from 29 earthquakes and at 25 stations on the Lan-Yang Plain. According to the surface geology, the sites of Lan-Yang Plain was divided into 3 areas:Ⅰ. sites on Lushan Formarion; Ⅱ. sites from the basin center to basin edge; Ⅲ. sites near by Nanao alluvium. Based on surface geology, I chose ILA052 to be the reference site. The results from the spectrum ratio of each soil site and the reference site in this study are summarize below:
    1.The S wave and Coda wave Spectral Ratios are similar on different frequency bands.
    2.There is site amplification in low frequencies on the central part of the plain. This site effect is probably related to basin structure.
    3.The site effect was not only related to surface geology but also other causes (e.g. surface topography). The causes of site amplification effect are many and complex.
    4.There are the same site amplification factors which were obtained by the spectral ratios of S waves and Coda waves.
    5.The advantage of using Coda waves of strong motion records to analyze site effect is that each acceleration record at different sites has absolute ground motion value. It is not necessary to correct the instruments response. It is convenient to study the Coda wave amplitudes.
    Table of Content 第一章 緒論................................1
    1.1 研究動機與目的.......................1
    1.2 文獻回顧.............................2
    1.3 本文內容.............................4
    第二章 研究區域及背景資料..................6
    2.1 地形及地質概況.......................6
    2.2 強震資料的蒐集......................15
    第三章 資料處理過程及研究方法.............19
    3.1 資料處理過程........................19
    3.1.1 參考站的選取..................19
    3.1.2 尾波時窗的選取................20
    3.1.3 檢視S波及尾波記錄的訊噪比....22
    3.2 研究方法............................27
    3.2.1 S波的頻譜比..................27
    3.2.2 尾波的頻譜比..................32
    第四章 研究結果與分析討論.................35
    4.1 Ⅰ區:位於廬山層的測站..............35
    4.2 Ⅱ區:平原中心到平原邊緣連線的測站..40
    4.3 Ⅲ區:南澳附近的沖積層測站..........43
    4.4 S波與尾波頻譜比標準差的比較........46
    4.5 S波與尾波放大係數的相關性..........48
    4.6 與前人研究成果比較..................48
    第五章 結論...............................51
    參考文獻..................................53
    附 錄..................................56
    英文摘要..................................81
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    Advisor
  • Yi-Ben Tsai(蔡義本)
  • Files
  • 86224010.pdf
  • approve immediately
    Date of Submission 2000-07-01

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