台灣西北部地區，在地震分佈上有一西北-東南向長約65公里、寬約15公里的地震密集帶（三義-埔里地震帶）。於1999年集集地震後，在其北側出現了兩群地震密集區。三義-埔里地震帶和北側的兩個地震密集區，在地表上並無與這些地震分佈相符合的構造特徵，因此研究此地區的地體構造是一個相當重要的課題。本研究使用中央氣象局所提供之三分量短週期數位地震資料，藉由地震三維層析成像（seismic tomography）、地震重新定位、震源機制以及應力反演等方法來加以討探其地體構造。研究結果顯示，三義-埔里地震帶的構造特性，主要為左移之平移斷層與台灣褶皺逆衝帶雙重影響之下的產物；另外，集集地震前（震間時期）三義-埔里地震帶淺層地震所反映之應力狀態是受到地震帶控制，其σ1方向（N97o）與地震帶走向（N140o）之夾角（43o），顯示出一弱斷層帶（weak fault zone）的特性，集集地震後應力釋放，使得三義-埔里地震帶淺層地震之σ1方向由N97o改變為N126o—與區域σ1方向（N130o）近乎平行。集集地震後於三義-埔里地震帶北側的兩個地震密集區，其構造可能屬於疊加式走向滑移構造（strike-slip duplexes）的形式，而地震密集區所反映出之構造特性為西部麓山帶與雪山山脈造山過程中所形成東西向橫移斷層的一部分；其應力狀態於地震密集區北段的σ1方向為N136o，地震密集區南段的σ1方向為N135o，此一應力狀態造成地震密集區所在位置之舊構造的再次活動。

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交通部中央氣象局地震季報，第五十卷，第四號，第1~9頁，2004。

朱傚祖、盧佳遇、李建成、林能通，擠壓、橫斷、背衝及伸張大地構造：以雪山山脈為例，地質，第15卷，第2期，第61-80頁，1996。

何春蓀，臺灣地質概論-臺灣地質圖說明書，增訂第二版，經濟部中央地質調查所出版，共164 頁，1986。

邱華燈，臺中縣大安背斜震波測勘之結果及其解釋，中國地質學會專刊，第1號，第187-188頁，1962。

林朝棨，臺灣地形，臺灣省通志稿，卷一，土地志，地理篇，第一冊，臺灣省文獻委員會，共424頁，1957。

林慶偉，阿里山-玉山地區之地質，海峽兩岸地質學術研討會-野外地質旅行書，第138-145頁，1995。

畢慶昌，台灣之另一海岸山脈，地質，第12卷，第1期，第1-12頁，1992。

經濟部中央地質調查所，九二一地震地質調查報告，共315頁，1999。

經濟部中央地質調查所，臺灣地質圖，2000。

潘國樑、王文能、胡國興、顏滄坡，台灣中部1935年地震斷層航照地質研究，工業技術研究院能源與礦業研究所，共47頁，1983。
鄧屬予，台灣地質之九-台灣的沈積岩，經濟部中央地質調查所編印，共235頁，1997。

盧佳遇、張國楨、簡文鏜、鄭富書，台灣西部的新構造運動-砂盒模型分析的啟示，台灣之第四紀第六次研討會論文集，第303-305頁，1996。

Aki, K., and P. G. Richards, Quantitative Seismology: Theory and Methods, 2nd. ed., University Science Books, California, 2002.

Angelier, J., Sur l’analyse de measures recueillies dans des sites faillé: l’utlité d’une confrontation entre les methods dynamiques et cinématiques. C. R. Acad. Sci. Paris (D), 281, 1805-1808, 1975 (Erratum: Ibid., 283, 466, 1976).

Angelier J., Determination of the mean principal direction of stresses for a given fault population, Tectonophysics, 56, T17-T26, 1979.

Angelier J., Tectonic analysis of fault slip data sets, J. Geophys. Res., 89, 5835-5848, 1984.

Angelier, J., From orientation to magnitudes in paleostress determinations using fault slip data. J. Struct. Geol., 11, 37-50, 1989.

Angelier, J., Fault slip analysis and paleostress reconstruction, In Continental Deformation, Edited by P. Hancock, pp. 53-100, Pergamon, New York, 1994.

Beroza, G. C., and G. H. R. Bokelmann, Constraints on crustal and fault-zone rheology from earthquake mechanisms, Final Technical Report 01HQGR0020, U.S. Geological Survey, 2001

Biq, C., The Yushan-Hsuehshan megashear zone in Taiwan, Proc. Geol. Soc. China, 32(1), 7-20, 1989.

Biq, C., Another coastal range on Taiwan, Ti-Chih, 12, 1-12, 1992 (in Chinese, with English abstract).
Burke, K., and C. Sengör, Tectonic escape in the evolution of the continental crust, in Reflection Seismology: the Continental Crust, edited by M. Barazani, pp. 41-53, Geodynamic Series 14, AGU, 1986.

Chang, S.L., Surface geologic study of the Taichung basin, Taiwan. Petrol. Geol. Taiwan, 8, 21-45, 1971.

Chen, W.-P., and P. Molnar, Focal depths of intracontinental and intraplate earthquakes and their implications for the thermal and mechanical properties of the lithosphere, J. Geophys. Res., 89, 4183-4213, 1983.

Chen, W.-P., and Z. Yang, Earthquakes beneath the Himalayas and Tibet: Evidence for strong lithospheric mantle, Science, 304, 1949-1952, 2004.

Chiu, H. T., Miocene stratigraphy of the Nantou area,
cental Taiwan, Petrol. Geol. Taiwan, 10, 159-177, 1972.
Chou, J.-T., Sedimentology and Paleogeography of the upper Cenozoic system of western Taiwan, Proc. Geol. Soc. China, 16, 111-143, 1973.

Davis, G. H., and S. J. Reynolds, Structural Geology of Rocks and Regions, 2nd. ed., John Wiley & Sons, Inc., New York, 1996.

Deffontaines, B., J.-C. Lee, J. Angelier, J. Carvalho, and J.-P. Rudant, New geomorphic data on the active Taiwan orogen: A multisource approach, J. Geophys. Res., 99, B10, 20243-20266, 1994.

Deffontaines, B., O. Lacombe, J. Angelier, H. T. Chu, F. Mouthereau, C. T. Lee, J. Deramond, J. F. Lee., M. S. Yu, P. M. Liew, Quaternary transfer faulting in the Taiwan Foothills: evidence from a multisource approach, Tectonophysics, 274, 61-82, 1997.

Eberhart-Phillips, D., Local earthquake tomography: earthquake source regions, in Seismic Tomography: Theory and Practice, edited by H. M. Iyer and K. Hirahara, pp. 614-643, Chapman and Hall, London, 1993.

Ellsworth, W. L., and X. Zhonghuai, Determination of the stress tensor from focal mechanism data, abstract, Eos Trans. AGU, 61, p. 1117, 1980.

Evans, J. R., D. Eberhart-Phillips, and C. H. Thurber, User’s Manual for SIMULPS12 for imaging Vp and Vp/Vs: A derivative of the “Thurber” Tomographic inversion SIMUL3 for Local Earthquakes and Explosions, Open-file Report 94-431, U.S. Geological Survey, 1994.

Gephart, J. W., and D. W. Forsyth, An improved method for determining the regional stress tensor using earthquake focal mechanism data: application to the San Fernando earthquake sequence, J. Geophys. Res., 89, 9305-9320, 1984.

Gephart, J. W., FMSI, A Fortran program for inverting fault/slickenside and earthquake focal mechanism data to obtain the regional stress tensor, Comput. and Geosci., 16, 953-989, 1990a.

Gephart, J. W., Stress and the direction of slip on fault planes, Tectonics, 9, 845-858, 1990b.

Hardebeck, J. L., and E. Hauksson, Stress orientations obtained from earthquake focal mechanisms: what are the appropriate uncertainty estimates? Bull. Seiemol. Soc. Am., 91, 250-262, 2001.

Hsiao, P. T., Seismic study of the area between the Coastal Plain and the Foothills, Yunlin, Taiwan, Petrol. Geol. Taiwan, 8, 249-263, 1971.

Husen, S., Local earthquake tomography of a convergent margin, North Chile, zur Erlangung des Doktorgrades, 129 pp., 1999.

Kao, H., and W.-P. Chen, The Chi-Chi earthquake sequence: Active, out-of-sequence thrust faulting in Taiwan, Science, 30, 2346-2349, 2000.

Kissling, E., Program VELEST USER’S GUIDE – Short Introduction, Institute of Geophysics, ETH Zuerich, 1995.

Kisslinger, C., Evaluation of S to P amplitude ratios for determining focal mechanisms from regional network observations, Bull. Seismol. Soc. Am., 70, 4, 999-1014, 1980.

Kisslinger, C., J. R. Bowman, and K. Koch, Procedures for computing focal mechanisms from regional network observations, Bull. Seismol. Soc. Am., 70, 999-1014, 1981.

Lin, C.-H., and S. W. Roecker, Deep earthquakes beneath central Taiwan: mantle shearing in an arc-continent collision, Tectonics, 12, 745-755, 1993.

Liu, J.-K., and W.-J. Yuan, Lineament analysis of Taiwan SLAR imagery, Mining Technology, 20, 95-123, 1982 (in Chinese, with English abstract).

Lu, C.-Y., Neotectonics in the foreland thrust belt of Taiwan, Petro. Geol. Taiwan, 29, 1-26, 1994.

Lu, C.-Y., and J. Malavieille, Oblique convergence, indentation and rotation tectonics in the Taiwan Mountain Belt: Insights from experimental modeling, Earth Planet. Sci. Lett., 121, 477-494, 1994.

Lu, C.-Y., H. T. Chu, and J. C. Lee, Structural evolution in the Hsuehshan Range, Taiwan, J. Geol. Soc. China, 40, 1, 261-279, 1997.

McKenzie, D. P., The relation between fault plane solutions and the directions of the principal stresses, Bull.
Seismol. Soc. Amer., 59, 591-601, 1969.

Meng, C.-Y., A conception of the evolution of the island of Taiwan and its bearing on the development of the western Neogene sedimentary basins, Petrol. Geol. Taiwan, 9, 239-258, 1971.

Michael, A. J., Determination of stress from slip data: Faults and folds, J. Geophys. Res., 89, 11517-11526, 1984.

Michael, A. J., Use of focal mechanisms to determine stress: A control study, J. Geophys. Res., 92, 357-368, 1987a.

Michael, A. J., Stress rotation during the Coalinga aftershock sequence, J. Geophys. Res., 92, 7963-7979, 1987b.

Rau, R.-J., and F. T. Wu, Tomographic imaging of lithospheric structures under Taiwan, Earth Planet. Sci. Lett., 133, 517-532, 1995.

Rau, R.-J., and F. T. Wu, Active tectonics of Taiwan orogeny from focal mechanisms of small-to-moderate-sized earthquakes, Terr. Atmos. Ocean. Sci., 9, 4, 755-778, 1998.
Rau, R.-J., F. T. Wu, and T.-C. Shin, Regional network focal mechanism determination using 3D velocity model and SH/P amplitude ratio, Bull. Seismol. Soc. Amer., 86, 5, 1270-1283, 1996.

Snoke, J. A., FOCMEC: FOcal MEChanism determinations, International Handbook of Earthquake and Engineering Seismology (W. H. K. Lee, H. Kanamori, P. C. Jennings, and C. Kisslinger, Eds.), Academic Press, San Diego, Chapter 85.12. , 2003

Suppe, J., Kinematics of arc-continent collision, flipping of subduction, and back-arc spreading near Taiwan, Mem. Geol. Soc. China, 6, 21-33, 1984.

Teng, L. S., Geotectonic evolution of Late Cenozoic arc-continent collision in Taiwan, Tectonophysics, 183, 57-76, 1990.

Tang, C. H., Late Miocene erosional unconformity of the subsurface Peikang high beneath the Chiayi-Yunlin coastal plain, Taiwan, Mem. Geol. Soc. China, 2, 155-167, 1977.

Thurber, C. H., Local earthquake tomography: Velocities and Vp/Vs – Theory, in Seismic Tomography: Theory and Practice, edited by H. M. Iyer and K. Hirahara, pp. 563-583, Chapman and Hall, London, 1993.

Yeh, Y.-H., H.-Y. Yen, and Y.-B. Tsai, A study of the 1935 earthquake faults in central Taiwan by microearthquake and gravity surveys, Bull. Geophy., National Central University, 25, 13-32, 1984.

Yu, S.-B., H.-Y. Chen, and L.-C. Kuo, Velocity field of GPS stations in the Taiwan area, Tectonophysics, 274, 41-59, 1997.

Wells, D. L., and Coppersmith, K. J., New empirical relationships among magnitude, rupture length, rupture width, rupture area, and surface displacement, Bull. Seismol. Soc. Am., 84, 974-1002, 1994.

Wiemer, S., A software package to analyze seismicity: ZMAP, Seismological Research Letters, 72, 373-382, 2001.

Woodcock, N. H., and M. Fischer, Strike-slip duplexes, J. Struct. Geol., 8, 725-735, 1986.

Wu, F. T., R.-J. Rau, and D. Salzberg, Taiwan orogeny: thin-skinned or lithospheric collision? Tectonophysics, 274, 191-200, 1997.

Zoback, M. L, First- and second-order patterns of stress in the lithosphere: The world stress map project, J. Geophys. Res., 97, 11703-11728, 1992.

Zoback, M. D., M. L. Zoback, V. S. Mount, J. Suppe, J. P. Eaton, J. H. Healy, D. Oppenheimer, P. Reasenberg, L. Jones, C. B. Raleigh, I. G. Wong, O. Scotti, and C. Wentworth, New evidence on the state of stress of the San Andreas fault system, Science, New Series, 238, 4830, 1105-1111, 1987.