摘要(英) |
GPS (Globe Positioning System) is widely used to measure crustal deformation in recent years. Besides tectonic movement, environmental factors also contribute a considerable portion of measured deformation. The influence of environmental factors on altitude variation is significant. Especially, Taiwan is an island easily affected by tides, air temperature, air pressure and water-storage loading etc. The surveyed altitude data with continuous GPS stations built by IES (Institute of Earth Sciences in Academia Sinica) and MOI (Ministry of Interior) from January 1994 to middle of 1999 were used in this study.10 local weather observation stations that are adjacent to the GPS stations we also collected. Additional, we used ground water leveling data of Laupi to analyze if height of S23R is affected by ground water change.
We apply three different methods to understand the relationship between continuous altitude variations and environmental factors. (1) We separated data into IES, MOI and five local regions then employed PCA (Principle Component Analysis) to understand principle modes of height variation in time series. (2) We employed FFT (Fast Fourier Transform) to know cycling change of each station. (3) First, we used simple regression and statistic test to interpret influence of particular factor. Then we employed forward selecting and MRA (multiple regressions analysis) to build up the influenced model of environmental factors.
Conclusion of this study can be summarized as follows: Except in north region, annual and semiannual period can be analyzed in GPS height variation by PCA. Because data lengths are not long enough, we can only detect 14, 28 days and else smaller than 200 days periods signal by FFT. Approximately, the effect of environment factors listed according to magnitude include Sa tide, air temperature, Mf tide, air pressure, relative humility, Ssa tide, rainfall and Mm tide. Average amplitude affected by Sa, Ssa, Mm, Mf tides are 4.56, 3.39, 2.19, 5.46mm, respectively, and 0.44mm/℃, -0.40mm/mb by air temperature and pressure. It means ocean tide correction still is not enough either in island or near coast. Concrete, soil thermal expansion and atmosphere loading may cause vertical displacement. There are other geophysical sources that are not considered in this study should be investigated in future. |
參考文獻 |
余水倍(1999)活動斷層及地盤下陷水準測量。中央地質調查所報告第88-005號,第6-15頁,共59頁。
林真真、鄒幼涵(1990)迴歸分析。華泰書局,第215頁,共371頁。
周耀鑾(1982)混凝土施工(THE ADVANCED CONCRETE CONSTRUCTION METHODS)。科教圖書出版社,第25頁,共581頁。
郭隆晨(2001)高精度GPS衛星測量在地殼變形觀測之研究。國立交通大學土木工程學系博士論文,共203頁。
黃兆龍(1997)混凝土性質與行為。詹式建築書局,初版二刷,第550頁,共933頁。
秦啟文、鄭立新、林文勝、楊舜行(2000)屏東地下水資源之研究。經濟部八十九年度研究發展專題,經濟部水資源局,第35頁,共128頁。
張瑞剛(2000)GPS衛星測量學。菁雲文化有限公司,二版,第11頁,共419頁。
曾清涼、余致義、林宏麟(1988)公分級精度GPS衛星測量研究(Ⅰ)。國科會專題研究報告NSC77-04110-E006-28,共158頁。
劉啓清(1999)台灣地區驗潮站及高程基準網之監測及計算工作。中央研究院地球科學研究所專題研究計畫成果報告,共70頁。
E. Oran Brigham、黎文明譯(1991)快速傅立葉變換(THE FAST FOURIER TRANSFORM)。復漢出版社,第1-57頁,二刷,共266頁。
Angelier, J., E. Barrier, H. T. Chu (1986) Plate collision and paleostress trajectories in a fold-thrust belt: the Foothills of Taiwan. Tectonophysics. Vol.125, 161-178.
Angelier, J. (1986) Preface to the special issue on “Geodynamics of the Eurasian-Philippine Sea Plate Boundary”. Tectonophysics, Vol.125, pp. IX-X.
Aoki, S., T. Ozawa, K. Doi, K. Shibuya (2000) GPS observation of the sea level variation in Lutzow-Holm Bay, Antarctica. Geophysical Research Letters. Vol.27, No.15, 2285-2288.
Aoki, S., K. Shibuya, A. Masuyama, T. Ozawa, K. Doi (2002) Evaluation of seasonal sea level variation at Syowa Station, Antarctica, using GPS observations. Journal of Oceanography. Vol.58, No.3, 519-523.
Aoki, Y., C.H. Scholz (2003) Vertical deformation of Japanese island, 1996-1999. Journal of Geophysical Research B, Solid Earth and Planets. Vol.108, NO.B5, ETG 10-1-12.
Bawden, G. W., W. Thatcher, R. S. Stein, K. W. Hudnut, G. Peltzer (2001) Tectonic contraction across Los Angeles after removal of groundwater pumping effects. Nature. Vol.412, No.6849, 812-815.
Bouma, H. R., B. Stoew (2001) GPS Observations of Daily Variations in the Atmospheric Water Vapor Content. Phys. Chem. Earth. Vol.26, No.6-8, 389-392.
Dong, D., P. Fang, Y. Bock, M. K. Cheng, S. Miyazaki (2002) Anatomy of apparent seasonal variations from GPS derived site position time series. Journal of Geophysical Research, B, Solid Earth and Planets, Vol.107, No.B4, ETG 9-1-16.
Douglas, W. B., R. S. Anderson (2001) Tectonic Geomorphology Chapter 5: Short-Term Deformation: Geodesy. 85-103.
Dragert, H., T. S. James, A. Lambert (2000) Ocean Loading Corrections for Continuous GPS: A Case Study at the Canadian Coastal Site Holberg. Geophysical Research Letters. Vol.27, No.14, 2045-2048.
http:// www.iers.org/
http:// maia.usno.navy.mil/conventions.html
Hugentobler, U., S. Schaer, and P. Fridez (2001) (Eds.) Bernese GPS Software Version 4.2, 511pp, Astronomical Institute, University of Berne, Switzerland, February.
Kumar, K.V., K. Miyashita, J.X. Li (2002) Secular crustal deformation in central Japan, based on the wavelet analysis of GPS time-series data. Earth Planets and Space. Vol.54, No.2, 133-139.
Lallemand, S., Y. Font, H. Bijwaard, H. Kao (2001) New insight on 3-D plates interaction near Taiwan from tomography and tectonic implications. Tectonophysics Vol.335, 229-253.
Liu, C. C. (1989) Impact of crust deformation on tide gauge records. Proceeding of the Geological Society of China. Vol.32, No.4, 321-338.
Rothacher, M., and L. Mervart (Eds.) (1996) Bernese GPS Software V4.0 Documentation, Univ. Bern, Switzerland, 418 pp.
Savage, J. C. (1988) Principal Component Analysis of Geodetically Measured Deformation in Long Valley Caldera, Eastern California, 1983-1987. Journal of Geophysical Research B, Solid Earth and Planets. Vol.93, No.11, 13,297-13,305.
Savage, J. C., W. Thatcher (1992) Interseismic deformation at the Nankai Trough, Japan, subduction zone. Journal of Geophysical Research, B, Solid Earth and Planets. Vol.97, No.7 11,117-11,135.
Savage, J. C. (1995) Principal component analysis of interseismic deformation in Southern California. Journal of Geophysical Research, B, Solid Earth and Planets, Vol.100, No.7,12,691-12,701.
Seno, T. (1977) The instantaneous rotation vector of the Philippine Sea plate relative to the Eurasian plate. Tectonophysics. Vol.42, 209-226.
Shoji, Y., H. Nakamura, K. Aonashi, A. Ichiki, H. Seko (2000) Semi-diurnal and diurnal variation of errors in GPS precipitable water vapor at Tsukuba, Japan caused by site displacement due to ocean tidal loading. Eearth Planets and Space. Vol.52, No.10, 685-690.
Van Dam, T., J. Wahr, P. C. D. Milly, A. B. Shmakin, G. Blewitt, D. Lavallee, K. M. Larson (2001) Crustal displacements due to continental water loading. Geophysical Research Letters. Vol.28, No.4, 651-654.
Yu, S. B., H. Y. Chen (1994) Global Positioning System Measurement of Crustal Deformation in the Taiwan Arc-Collision Zone. TAO. Vol.5, No4, 477-498.
Yu, S. B., H. Y. Chen, L. C. Kuo (1997) Velocity field of GPS stations in the Taiwan area. Tectonophysics. Vol.274, 41-59.
Yu, S. B., L. C. Kuo, R. S. Punongbayan and E. G. Ramos (1999) GPS observation of crustal motion in the Taiwan-Luzon region. Geophys. Res. Lett., 26, 923-926.
Zerbini, S., B. Richter, M. Negusini, C. Romagnoli, D. Simon, F. Domenichini, W. Schwahn (2001) Height and gravity variations by continuous GPS, gravity and environmental parameter observations in the southern Po Plain, near Bologna, Italy. Eearth and Planetary Science Letters. Vol.192, No.3, 267-279. |