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Student Number 86224013
Author Hsuan You(郭炫佑)
Author's Email Address No Public.
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Department Graduate Institute of Geophysics
Year 1998
Semester 2
Degree Master
Type of Document Master's Thesis
Language zh-TW.Big5 Chinese
Title Detecting Houchiali Fault and Its Neighboring Structures Using Shallow Seismic Reflection Method
Date of Defense
Page Count 83
Keyword
  • Choungchou anticline
  • Houchiali fault
  • shallow seismic reflection
  • Tainan anticline
  • Tawan syncline
  • Abstract Houchiali fault is located along the eastern border of Tainan tableland, southern Taiwan. The fault extends approximately in the north-south direction with a length of 11 km. It takes an S shape and a part of it is parallel to the highway. On the ground, the fault has a clear fault scarp and the Tawan lowland is at its eastern side. Previous studies indicated that Houchiali fault was formed by the uplifting of Tainan anticline which causes a fault shifting along the side. The research used the shallow seismic reflection method to detect the Houchiali fault as well as its nearby structures. By using three long reflection seismic lines, we are able to examine this fault. The obtained fault images are extremely clear on the seismic profiles. By carefully comparing the reflection layers on each side, we find that the Houchiali fault is a normal fault. Tainan formation is covered on the Houchiali fault steadily. It seems that Houchiali fault may not activate after the deposition of Tainan formation.
    In addition to the fault detection, we also used fourteen short-range seismic lines arranged from the Tainan coast to the Kuanmiao area to investigate the background geology structure near the fault. After carefully reserving the characteristics of each reflector, we are able to correlate different layers on different seismic profiles and obtain a gross picture of structural variation along the east-west profile. The related structures from west to east are Tainan anticline, Tawan syncline and Chungchou anticline.
    The research obtained the following results:
    1. The fault images are extremely clear on the seismic
    profiles. The reflection layers in the eastern part of the
    fault are unbelievably flat, but the layers in the western
    part of the fault are tilted, updipping to the west. By
    carefully comparing the reflection layers on each side, we
    find that the Houchiali fault is a normal fault.
    2. Tainan formation is covered upon the Houchiali fault
    steadily. It seems that Houchiali fault may not activate
    after the deposition of Tainan formation. Because the layers
    are deformed in a consistent way, Houchiali fault probably
    occurred in a one-time process.
    3. Tainan anticline is believed due to the mud diapiric lifting
    from the Gutingkeng formation. The Erhchungchi formation
    above it formed an anticline structure after mud diapiric
    intrusion. The axis of the anticline is located west of that
    proposed by Sun (1964). Tainan anticline has an
    unsymmetrical shape, the east limb is dipper than the west
    limb.
    4. Houchiali fault is formed by the mud diapiric lifting
    together with the plate tectonic forth. The tectonic
    movement twisted the eastern limb of Tainan anticline and
    trigged the Houchiali fault along its eastern boundary.
    5. The subsurface structure in Tawan lowland is located at the
    deeper places. The shape of Tawan syncline is not obvious,
    and the Chungchou anticline is gentler than Tainan
    anticline. The Liushuang formation has entered the lowland
    and unconformably seated above the Erhchungchi formation.
    6. The research proposed an effective seismic reflection survey
    technique to detect the activity fault. The procedures
    included (1) use several seismic lines (three at least) and
    overlap (do it twice for one seismic line), to define the
    fault images carefully, (2) use areal seismic line spread to
    find the structure near the fault which may provide the
    basic structural information related to the fault. These
    procedures are proved useful to detect the fault as well as
    to find the geology setting that may induce the fault.
    Table of Content 提要i
    誌謝ii
    目錄iii
    圖目v
    表目viii
    第一章 緒論1
    1.1研究動機與目的1
    1.2文獻回顧1
    1.3本文內容8
    第二章 研究區域地質概述10
    2.1研究區內的重要構造10
    2.2地層岩性16
    第三章 淺層反射震測施測及資料處理19
    3.1淺層反射震測原理19
    3.2野外工作23
    3.2.1野外儀器設備23
    3.2.2野外施測26
    3.3資料處理流程29
    3.4廣域測線佈設與地層構造追蹤36
    第四章 震測剖面結果分析39
    4.1後甲里斷層震測結果39
    4.2廣域佈線震測結果53
    4.3廣域佈線綜合結果72
    第五章 討論與結論77
    5.1討論77
    5.2結論78
    參考文獻80
    英文摘要 82
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    Advisor
  • Chien Ying Wang(王乾盈)
  • Files No Any Full Text File.
    Date of Submission

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