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研究生: 林銘駿
Ming-Chiun Lin
論文名稱: 甚低頻電磁法之淺層探勘
Application of VLF-EM methods in the shallow exploration
指導教授: 鄭懌
Jeng, Yih
學位類別: 碩士
Master
系所名稱: 地球科學系
Department of Earth Sciences
論文出版年: 2000
畢業學年度: 88
語文別: 中文
論文頁數: 72
中文關鍵詞: 甚低頻電磁法集膚深度淺層探勘電磁波
英文關鍵詞: VLF-EM, VLF, skin depth
論文種類: 學術論文
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  • 本研究利用加拿大SCINTREX公司1997年發展出來的ENVI地球物理探勘系統中之ENVI-VLF測勘儀,取得地下構造的參數,分析地下低導電性導體所引發的電性異常。本研究先在師大分部歐洲公園埋設一磚體模型,利用澳洲的發射塔台作為電磁波的源場,進行模擬測勘。所得的原始資料分成in-phase 和quadrature兩部份, 經過 Fraser 濾波處理以濾除地表雜訊所引起的異常,再將處理過的資料做2-D的等值圖分析,以瞭解地下構造異常體的分布位置,再由Karous和Hjelt 線性濾波逆推地下異常地質體的等效電流密度,經由等效電流密度的剖面推測異常體的深度。
    由於低導電性(low-conductivity)的模型在未固結的雜亂回填土壤中產生許多淺部甚低頻電磁波的異常反應,所以必須經濾波平滑處理後模型的反應才顯現。實測案例中,測線的安排橫切過地層對比明顯的斷層帶,VLF電磁波探勘能清楚解析斷層帶所造成的異常,經由濾波處理後的擬似剖面圖更能確定斷層帶的地下分布。VLF的淺層地質構造測勘確有其快速簡便的優點,而適當的濾波處理更能提高此法定量解析的可信度。

    第一章 緒論……………………………………………………… 1 第二章 理論基礎……………………………………………… 7 2-1 甚低頻電磁波的傳播………………………………… 7 2-2 集膚深度……………………………………………… 8 2-3 原生與次生磁場的來源……………………………… 13 2-4 導體位置的確定……………………………………… 18 2-5 導體深度的判定……………………………………… 20 第三章 研究方法……………………………………………… 24 3-1 ENVI-VLF系統簡介…………………………………… 24 3-2 模型的建立…………………………………………… 25 3-3 模型的試驗…………………………………………… 25 3-4 實測案例-車籠埔斷層……………………………… 29 第四章 資料處理……………………………………………… 32 4-1 參數分析……………………………………………… 32 4-2 野外工作和資料收集………………………………… 32 4-3 Fraser 濾波處理與應用…………………………… 34 4-4 逆推地下等效電流…………………………………… 34 4-5 資料解釋流程………………………………………… 37 第五章 結果與討論…………………………………………… 38 5-1 歐洲公園的試驗……………………………………… 38 5-2 實測案例……………………………………………… 58 第六章 結論…………………………………………………… 67 參考文獻………………………………………………………… 69

    李建成, 安朔葉, 朱傚祖, 胡植慶, 詹瑜璋, 1999, 集集大地震特輯, 921大地震地表斷層破裂特性: 斷層幾何型態與運動學分析: 交通部氣象局中國地球物理協會。
    賴典章 1997, 車籠埔斷層調查研究: 台灣省政府住宅及都市發展處研究報告。

    Abdul-Malik, M. M., Myers, J. O., and McFarlane, J., 1985, Model studies of topographic noise in VLF-EM data: accounting for the direction of morphological strike relative to survey line and magnetic field direction: Geoexploration, 23, 217-225.
    Aina, A., and Emofurieta, W. O., 1991, VLF anomalies at contacts between Precambrian rocks in southwestern Nigeria: Geoexploration, 28, 55-65.
    Baker, H. A., and Myers, J. O., 1979, VLF-EM model studies and some simple quantitative applications to field results: Geoexploration, 17, 55-63.
    Bendat, J. S., and Piersol, A. G., 1985, Random Data: Analysis and measurement procedures, 2nd, :John Wiley & Sons, Inc.
    Benson, A. K., Payne, K. L., and Stubben, M. A., 1997, Mapping groundwater contamination using dc resistivity and VLF geophysical methods – A case study: Geophysics, 62, 80-86.
    Bernard, J., and Valla, P., 1991, Groundwater exploration in fissured media with electrical and VLF methods: Geoexploration, 27, 81-91.
    Chouteau, M., Zhang, P., and Chaprllier, D., 1996, Computation of apparent resistivity profiles from VLF-EM data using linear filtering: Geophysical Prospecting, 44, 215-232.
    Coney, D. P., 1977, Model studies of the VLF-EM method of geophysical prospecting: Geoexploration, 15, 19-35.
    Eppelbaum, L. V., 1991, Examples of terrain corrections in the VLF method in the Caucasian region, USSR: Geoexploration, 28, 67-75.
    Fischer, G., Le Quang, B. V., and Müller, I., 1983, VLF ground surveys, a powerful tool for this study of shallow two-dimensional structures: Geophysical Prospecting, 31, 977-991.
    Fraser, D. C., 1969, Contouring of VLF-EM data: Geophysics, 34, 958-967.
    Gharibi, M., and Pedersen, L. B., 1999, Transformation of VLF data into apparent resistivities and phases: Geophysics, 64, 1393-1402.
    Guerin, R., and Benderitter, Y., 1995, Shallow karst exploration using MT-VLF and DC resistivity methods: Geophysical Prospecting, 43, 635-653.
    Jeng, Y., 1995 Shallow seismic investigation of a site with poor reflection quality: Geophysics, 60, 1715-1726.
    Kaikkonen, P., 1979, Numerical VLF modeling: Geophysical Prospecting, 27, 815-834.
    Karous, M. R., 1979, Effect of relief in EM methods with vary distant source: Geoexploration, 17, 33-42.
    ------ and Hjelt, S. E., 1983, Linear filtering of VLF dip-angle measurements: Geophysical Prospecting, 31, 782-794.
    Labson, V. F., and Becker, A., 1987, Natural-field and very low-frequency tipper profile interpretation of contacts: Geophysics, 52, 1697-1707.
    Lajoir, J. J., and West, G. F., 1976, The electromagnetic response of a conductive inhomogeneity in a layered earth: Geophysics, 41, 1133-1156.
    Nobes, D. C., 1999, Geophysical surveys of burial sites: A case study of the Oaro urupa: Geophysics, 64, 357-367.
    Ogilvy, R. D., and Lee, A. C., 1991, Interpretation of VLF-EM in-phase data using current density pseudosections: Geophysical Prospecting, 39, 567-580.
    Paál, G., 1965, Ore prospecting based on VLF-radio signals: Geoexploration, 3, 139-147.
    Parry, J. R., and Ward, S. H., 1971, Electromagnetic scattering from cylinders of arbitrary cross-section in a conductive half-space: Geophysics, 36, 67-100.
    Paterson N. R., and Ronka, V., 1971, Five years of surverying with the very low frequency-electro magnetics method: Geoexploration, 9, 7-26.
    Phillips, W. J., and Richards, W. E., 1975, A study of the effectiveness of the VLF method for the location of narrow-mineralized fault zone: Geoexploration, 13, 215-226
    Poddar, M., 1982, Very low-frequency electromagnetic response of a perfectly conducting half-plane in a layered half-space: Geophysics, 47, 1059-1067.
    Saydam, A. S., 1981, Very low-frequency electromagnetic interpretation using tilt angle and ellipticity measurements: Geophysics, 46, 1594-1605.
    Scintrex, 1997, ENVI geophysical system operations manual: Scintrex.
    Telford, W. M., Geldart, L. P., and Sheriff, R. E., 1990, Applied Geophysics, 2nd: Cambridge University Press.
    Thiel, D. V., 1979, Relative wave tilt measurement at VLF: Geoexploration, 17, 285-292.
    ------, D. V., and Chant, I. J., 1982, Ionospheric induced very low-frequency electric field wavetilt changes: Geophysics , 47, 60-62.
    Vallée, M. A., Michel C., and Palacky, G. J., 1992, Effect of temporal and spatial variations of the primary signal on VLF total-field surveys: Geophysics, 57, 97-105.
    ------, A., Michel, C., and Palacky, G. J., 1992, Variations of the VLF-EM primary field: Analysis of airbrone survey data, New Brunswick, Canada: Geophysics, 57, 181-186.
    Verma, O. P., Gaur, V. K., 1975, Transformation of electromagnetic anomalies brought about by a conducting host rock: Geophysics, 40, 473-489.
    Vozoff, K., 1971, The effect of overburden on vertical component anomalies in AFMAG and VLF exploration: A computer model study: Geophysics, 36, 53-57.
    Wait, J. R., 1970, Electromagnetic waves in stratified media, 2nd ed.: Oxford, New York, Pergamon Press.
    Won, I. J., 1980, A wide-band electromagnetic exploration method – Some theoretical and experimental results: Geophysics, 45, 928-940.

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