臺灣博碩士論文加值系統

摘 要
本研究使用台灣地區崙坪觀測臺自1988年1月至2000年12月的地磁場觀測資料，經過傅立葉轉換後以單位向量法﹙unit vector method﹚計算地磁場轉換函數﹙transfer functions﹚Au、Av、Bu及Bv值與可能偏差﹙likely error﹚值，並計算轉換函數向量橢圓的長、短軸長度與長軸的方向。
轉換函數值會受到太陽照射的影響而產生季節變化，台灣地區會受到影響的是頻率低於2 cycles/hour﹙相當於週期高於30分鐘﹚的部份。Au值和Bu值都是春秋低而夏冬高，Av值是冬低夏高而Bv值是冬高夏低。此外，在太陽黑子活動的極小期，Au值的高頻部份會有比較明顯的變化產生。
台灣地區在2、3、4及6 cycles/hour 四個頻率﹙週期相當於30、20、15及10分鐘﹚上會持續出現訊號，主要是因為附近地底電導率異常所產生。這四個頻率的轉換函數值，除了Au值會隨著時間慢慢上升，但在某些時段會突然下降然後再回到上升趨勢中之外，Av值、Bu值與Bv值長期來說大致呈水平趨勢。

目 錄
誌謝 …………………………………………………………… I
摘要 …………………………………………………………... II
圖目 …………………………………………………………... V
表目 ……………………………………………………….…VII
第一章 緒論 ………………………………………………... 1
第二章 研究方法 …………………………………………... 5
2.1 轉換函數計算方法 …………………………………... 5
2.2 以向量表示轉換函數 ………………………………... 7
第三章 資料處理 ………………………………………….. 11
3.1 資料來源 …………………………………………….. 11
3.2 處理程序 …………………………………………….. 13
3.3 程式測試 …………………………………………….. 15
3.4 資料時間 …………………………………………….. 17
第四章 結果與討論 ……………………………………….. 25
4.1轉換函數值在頻率域的變化 ………………………… 25
4.2轉換函數值的長期特性 ……………………………… 27
4.3特徵頻率之轉換函數值與向量橢圓 ………………… 30
第五章 結論 ………………………………………………... 68
參考文獻 ……………………………………………………... 70

參考文獻
BRIGHAM, E. O., 1988, The fast Fourier transform and its applications, 178-188.
CHEN, P. F., 1981, A search for correlation between time change in transfer functions and seismic activity in north Taiwan, J. Geomag. Geoelectr., 33, 635-643.
CHEN, P. F. and P. C. W. FUNG, 1990, Time changes in complex transfer functions at Lunping and the 1986 earthquake (MS=7.6) near Hualian, in Proceedings of the International Symposium on Geomagnetism, edited by the Organizing Committee of Conference, pp. 81-85, Seismological Bureau of Shanghai, China.
CHEN, P. F. and P. C. W. FUNG, 1993, Time changes in geomagnetic transfer functions at Lunping before and after the 1986 Hualian earthquake (MS=7.6), J. Geomag. Geoelectr., 45, 251-259.
COLSE, R. L., G. J. Van Beek and L. R. Newitt, 1987, Annual report for the magnetic observatories and repeat ststions 1985, paper 86-25, Geomagnetic series No. 31, Geological survey of Canada.
EVERETT, J. E. and R. D. HYNDMAN, 1967, Geomagnetic variations and electrical conductivity structure in southwestern Australia, Phys. Earth Planet. Int., 1, 24-34.
FUJITA, S., 1990, Monitoring of time changes of conductivity anomaly transfer functions at Japanese magnetic observatory network, Mem. Kakioka Mag. Obs., 23, 53-87.
GONG, S. J., 1985, Anomalous changes in transfer functions and the 1976 Tangshan earthquake (MS = 7.8), J. Geomag. Geoelectr., 37, 503-508.
HONKURA, Y., 1979, Observations of short-period geomagnetic variation at Nakaizu (2): Changes in transfer functions associated with the Izu-Oshima-Kinkai earthquake of 1978, Bull. Earthq. Res. Inst., Tokyo, 54, 477-490.
HUANG, Y. N., 1970, Geomagnetic variations at Lunping, Taiwan, Bulletin of Institute Geophysics, 8, 259-273.
HUANG, Y. N., 1990, On the digital geomagnetic observatory at Lunping, Taiwan, Physics of Earth and Planetary Interiors, 59, 66-77.
MIYAKOSHI, J., 1975, Secular variation of Parkinson vectors in a seismically active region of Middle Asia, J. Faculty Gen. Education, Tottori Univ., 8, 209-218.
OLHOEFT, G. R., 1981, Electrical properties of granite with implications for the lower crust, J. Geophys. Res., 86, B2, 931-936.
PARKINSON, W. D. 1959, Directions of rapid geomagnetic fluctuations, The Geophysical Journal of the Royal Astronomical Society, 2, 1-14.
PARKINSON, W. D. 1962, The influence of continents and oceans on geomagnetic variations, The Geophysical Journal of the Royal Astronomical Society, 6, 441-449.
PRESS, W. H., B. P. Flannery, S. A. Teukolsky and W. T. Vetterlimg, 1986, NUMERICAL RECIPES The Art of Scientific Computing, Cambridge university press, 390-395.
RIKITAKE, T. and I. YOKOYAMA, 1955, The anomalous behaviour of geomagnetic variations of short period in Japan and its relation to the subterranean structure, part 6 Bull. Earthquake Research Inst. 33, 297.
RIKITAKE, T., 1979, Changes in the direction of magnetic vector of short-period geomagnetic variations before the 1972 Sitka, Alaska, earthquake, J. Geomag. Geoelectr., 31, 441-448.
SANO, Y., 1980, Time changes of transfer functions at Kakioka related to earthquake occurrences (I), Mem. Kakioka Mag. Obs., 39, No. 2, 1-25.
SATOSHI, F. and T. Hiroaki, 1996, Geomagnetic transfer functions in Japan obtained by first order geomagnetic survey, J. Geomag. Geoelectr., 48, 1071-1101.
SCHMUCKER, U., 1970, Anomalies of geomagnetic variations in the south-western United State, Bull. Scripps Inst. Oceanogr., 13, 1-165.
SCHOLTZ, C. H., L. R. SYKES, and Y. P. AGGARWAL, 1973, Earthquake prediction: a physical basis, Science, 181, 803-810.
SCHOLTZ. C. H. and R. KRANZ, 1974, Notes on dilatancy recovery, J. Geophys. Res., 79, 2132-2135.
SHIRAKI, M., 1980, Monitoring of the time change in transfer functions in the central Japan conductivity anomaly, J. Geomag. Geoelectr., 32, 637-648.
WIESE, H., 1962, Geomagnetishe tiefentellurik Teil II: Die streichrichtung der untergrundstrukturen des elektrischen widerstandes, erschlossen aus geomagnetischen variation, Geofis. Pura Appl., 52, 83-103.
WYSS, M. et al., 1977, Tectonomagnetism and magnetic changes in rocks prior to failure, Proceedings of Conference II Experimental Studies of Rock Friction with Application to Earthquake Prediction, April 28-30, 449-489.
YANAGIHARA, K., 1972, Secular variation of the electrical conductivity anomaly in the central part of Japan, Mem. Kakioka Mag. Obs., 15, 1-11.
YANAGIHARA, K. and T. NAGANO, 1976, Time change of transfer function in the central Japan anomaly of conductivity with special reference to earthquake occurrences, J. Geomag. Geoelectr., 28, 157-163.
YOSHIMORI, H., 1978, Observations of short-period geomagnetic variations at Nakaizu (2): Changes in transfer functions associated with the Izu-Oshima-Kinkai, Bulletin of the Earthquake Research Institute, 54, 477-490.
丁鑒海, 盧振業, 黃雪香, 1993, 地震地磁學, 268-288.