活動斷層電性研究 — 以湖口、新城及山腳斷層為例;Studies of Electrical Characteristics of Hukou, Hsincheng and Sanchiao Active Faults, Northern Taiwan.

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题名:	活動斷層電性研究 — 以湖口、新城及山腳斷層為例;Studies of Electrical Characteristics of Hukou, Hsincheng and Sanchiao Active Faults, Northern Taiwan.
作者:	劉興昌;Hsin-chang Liu
贡献者:	地球物理研究所
关键词:	湖口斷層;新城斷層;台北盆地;地電阻影像剖面法;山腳斷層;RIP;Sanchiao Fault;Hukou Ffault;Hsinchen Fault;Taipei Basin
日期:	2009-05-22
上传时间:	2009-09-22 09:55:43 (UTC+8)
出版者:	國立中央大學圖書館
摘要:	桃園、新竹與台北為台灣北部重要之三大都會區，對於經過此區域三條活動斷層-湖口、新城與山腳斷層之電阻率構造與斷層位置是本研究關心與調查的重點，本研究總共在斷層沿線佈設了23條地電阻影像剖面法測線（RIP）、39處一維垂直測深測點（VES）與50個音頻大地電磁波測點（AMT）。本研究根據斷層與測線關係，以及地下電阻率分佈變化。可獲得下列成果： 1. 湖口斷層與新城斷層為逆斷層，斷層上盤為低電阻率地層，斷層下盤為高電阻率地層。斷層兩側電阻率有明顯高低區之分界。斷層兩側淺部高電阻率礫石層厚度會出現明顯落差。電阻率構造常出現不連續或是側向電阻率曲線出現急變，此現象常出現斷層上下盤交界處與斷層帶上。新城斷層常呈現均質地層中出現帶狀之異常。山腳斷層除兩側電阻率出現高低分界外，斷層帶接觸面間非常不規則。 2. 地電阻影像剖面為最佳斷層調查的方法，具有品質穩定，解析度高與短時間即可得到地下電阻率分佈的優點。缺點是都會區開發度高，無法將測線展開得到目標深度。音頻大地電磁波法在都會區施測，由於電磁場的干擾無法得到較佳之資料品質，故建議施測時輔以重力方法與鑽井資料比對，雖然無法進行詳細的地層電阻率分層，但可得到第四紀與第三紀地層高低電阻率的界面。 Taoyuan, Hsinchu, and Taipei are three major metro areas in northern Taiwan. This study attempts to survey the resistivity structures and locations of the three active faults – Hukou Fault, Hsinchen Fault, and Sanchiao Fault – passing through the three metro areas and has thus provided 23 resistivity imager profilings (RIP), 39 vertical electrical soundings (VES), and 50 audio-frequency magnetotellurics method (AMT) for this purpose. This study has examined the relationships between faults and profilings in addition to the underground resistivity and has acquired following results accordingly: 1. Both Hukou Fault and Hsincchen Fault are thrust faults wherein the hanging walls are lowly resistivity and fault footwall are highly resistivity. Discontinuous geoelectrical or lateral rapid change resistivity is shown in electrical layers, especially in the fault trace or fault zone. Anomalous bands in a homogenous layer are one of the features shown in the Hsinchen fault. In addition to a large lateral resistivity contrast shown in the Sanchiao fault, the contacts surface is very rough. 2. The advantage of RIP result has a better stability, higher resolution and less time-consuming than other resistivity sounding methods. But in the study area, surface obstacles limited the spread of some survey lines, thus the targeted depth of investigation was unattained. AMT survey can be interfered by culture EM wave; the quality of its sounding results is always severely affected, especially in the Taipei area. However, combining the AMT sounding results with the gravity result, geologic data, and formal logging information, the Sanchiao fault and the boundary between the sediment and basement of Taipei Basin can be recognized.
显示于类别:	[地球物理研究所] 博碩士論文

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