Title

花東縱谷斷層南段地表變形及斷層運動學分析

Translated Titles

Analyses of Crustal Deformation and Fault Kinematics in the Southern Part of Longitudinal Valley Fault,Eastern Taiwan

Authors

姜彥麟

Key Words

地表變形 ; 利吉斷層 ; 鹿野斷層 ; 台東地震 ; 大地測量 ; Crustal deformation ; Lichi fault ; Luyeh fault ; Taitung earthquake ; Geodetic survey.

PublicationName

臺灣師範大學地球科學系學位論文

Volume or Term/Year and Month of Publication

2006年

Academic Degree Category

碩士

Advisor

李通藝 博士;李建成 博士

Content Language

繁體中文

Chinese Abstract

摘 要 為了分析花東縱谷南段更詳細的地殼變形、斷層活動行為特性,鹿野斷層及利吉斷層的個別活動特性、更詳細的斷層可能的幾何形貌,本研究於台東縱谷南段卑南山附近地區,由北至南設置四條密集橫跨斷層的水準與GPS測線。本研究在研究期間內(2005-2007),分別實施四次的大地測量調查。由於2006年4月1日在研究地區發生規模6.1之台東地震,本研究將大地測量觀測資料的分析結果區分為(一)震前時期、(二)跨地震時期、(三)震後時期,三個時期來分析解釋地殼變形及相關的構造作用。在花東縱谷南段,除了利吉斷層和鹿野斷層有明顯的活動之外,亦有中央山脈東緣的Y斷層(台東地震發震構造)、可能沿著鹿野溪約東西走向的Z剪切帶及卑南山向斜軸部的活動。在海岸山脈和中央山脈之間的縱谷南段地區,受前述構造活動影響,呈現非剛體變形的模式,本研究解釋為地下地質為岩性較不均一的礫石層影響。受台東地震影響,引發利吉斷層和鹿野斷層活動或更活動,且在近斷層皆以褶皺變形為主,代表斷層在地下某一深度為鎖定或部份鎖定。而近斷層褶皺變形帶及跨越褶皺變形帶斷層的活動行為特性在台東地震數個月間即有改變。震前時期利吉斷層有明顯的逆衝和左移活動;鹿野斷層無明顯的變形;Y斷層北端有少許左移和壓縮的活動、南端則有右移和正斷層活動。跨地震時期利吉斷層兼具左移走向滑移和水平擠壓活動但近地表以褶皺變形作用為主。鹿野斷層則是以逆衝活動為主,帶非常少左移分量。震後時期利吉斷層和鹿野斷層的活動特性有回復到震前時期的跡象。利吉斷層有明顯的水平擠壓並帶少許左移走滑,鹿野斷層則無明顯變形。根據跨地震時期測量資料,利吉斷層的抬升量約15.5 mm,水平擠壓量約5 mm;鹿野斷層的抬升量約10 ~ 11 mm,水平擠壓縮量約13 mm,估算可得利吉斷層近地表的傾角約70度,鹿野斷層近地表傾角約35 ~ 40度。震前時期的Y斷層的南半段有反向滑移的作用,可能為台東地震的地震前兆。而鹿野斷層在台東地震震後半年至震後一年間,又開始有明顯的抬升運動,本研究解釋震前時期與震後時期鹿野斷層近地表鎖定不動為一短暫的現象。亦即受到Y斷層對鹿野斷層的效應,其影響時間約在震前半年至震後半年間。 關鍵詞: 地表變形、利吉斷層、鹿野斷層、台東地震、大地測量

English Abstract

ABSTRACT In order to analyze detailed crustal deformation, behaviors of fault activity, specifically the Luyeh fault and the Lichi fault, in the southern part of the Longitudinal Valley,eastern Taiwan, four leveling and GPS survey lines were set up and periodically measured across the faults near the Pinanshan area. During the study period (2005-2007), four geodetic surveys were carried out. Based on the Mw 6.1 earthquake that occurred on April 1st, 2006 near Taitung, the acquired geodetic survey data can be divided into: (1) pre-seismic period (2) inter-seismic period (3) post-seismic period for analyzing crustal deformation and structural effect. In the southern part of the Longitudinal Valley, there are the Y fault which is located at the eastern part of Central Range, the Z shear zone which strikes along the Luyeh river, and the folding deformation of the Pinanshan syncline. The area between the Central Range and the Coastal Range displays non-rigid deformation due to the heterogeneous nature of the conglomerate strata. Due to the 2006 Taitung Earthquake, the Lichi fault and the Luyeh fault became active, and show folding deformation near the fault, which may indicate that the faults have locked or partially locked near the surface. The characteristics of the fault activity have changed in a few months during the Taitung earthquake. At the pre-seismic period, the Lichi fault shows thrusting with left-lateral strike-slip component, and the Luyeh fault shows little or no deformation. The northern part of the Y fault shows a few left-lateral strike-slip with a thrusting component, while the southern part of the Y fault shows right-lateral strike-slip with a normal component. During the inter-seismic period, the Lichi fault shows thrusting and left-lateral strike-slips near the fault with folding deformation. The Luyeh fault shows thrusting and some left-lateral strike-slip component. At the post-seismic period, the activity characteristics of the Lichi fault and the Luyeh fault have returned to characteristics of the pre-seismic period. The Lichi fault shows shortening with some left-lateral strike-slip component. The Luyeh fault shows little or no deformation. According to the inter-seismic period data, the Lichi fault displaced 15.5 mm in uplift and 5 mm in shortening. The Luyeh fault displaced 10~11 mm in uplift and 13 mm in shortening. The study, therefore, estimates that the dip angle of the Lichi fault is about 70?and the dip angle of the Luyeh fault is 35?~ 40?.The Y fault back-slipped in the pre-seismic period, which may be interpreted as a precursor of the Taitung earthquake. The Luyeh fault shows uplift half a year upto one year after the Taitung earthquake. This study indicates that the locking of the Luyeh fault is a temporary phenomenon and that the Y fault influenced the activity of the Luyeh fault half a year before the earthquake and half a year after the earthquake. Key words: Crustal deformation, Lichi fault, Luyeh fault, Taitung earthquake, Geodetic survey.

Topic Category 基礎與應用科學 > 地球科學與地質學
理學院 > 地球科學系
Reference
  1. 紀權窅 (2006) 南段花東縱谷之新期構造研究-利吉斷層與鹿野斷層的活動特性。國立台灣大學地質科學所碩士論文,共84頁。
    連結:
  2. 楊貴三 (1986) 台灣活斷層的地形學研究—特論活斷層與地形面的關係,私立中國文化大學地學研究所博士論文,共178頁。
    連結:
  3. Barrier, E., Angelier, J. (1986) Active collision in eastern Taiwan. the Coastal Range. Memoir of the Geol. Soc. China, 7, 135-159.
    連結:
  4. Chang, C. P., Angelier, J., Huang, C. Y., Liu, C. S. (2001) Structural evolution and significance of a m?lange in a collision belt:the Lichi M?lange and the Taiwan arc–continent collision. Geol. Mag. 138 (6), 633-651.
    連結:
  5. Chen, H. Y., Hsu Y. J., Lee, J. C., Yu, S. B., Kuo, L. C., Liu C. C., Tsai, C. S. (2007) Coseismic Displacements and Slip Distribution Iferred form GPS and Leveling Observations for the 2006 Peinan Earthquake (Mw 6.1) in Southeastern Taiwan. Inpublication.
    連結:
  6. Hu, J. C., Angelier, J., Homberg, C., Lee, J. C., and Chu, H. T., (2001) Three-dimoensional modeling of the behavior of the oblique convergent boundary of southern Taiwan: fricrion and strain partitioning. Tectonophysics, 333, 261-276.
    連結:
  7. Hu, J. C., Cheng L. W., Chen, H. Y., Wu Y. M., Lee, J. C., Chen, G. C., Lin, K. C., Rau, R. J., Kuochen, H., Chen, H. H., Yu, S. B. and Angelier, J. (2007) Coseismic deformation revealed by inversion of strong motion and GPS data:the 2003 Chengkung earthquake in eastern Taiwan. Geophys. 169, 667-674.
    連結:
  8. Lee, J. C., Angelier, J., Chu, H. T., Yu, S. B. and Hu, J. C. (1998) Plate-boundary strain partitioning along the sinistral collision suture of the Philippine and Eurasian plates: analysis of geodetic data and geological observation. Tectonics, 17, 859-871.
    連結:
  9. Lee, J. C., Chu, H. T., Angelier, J., Hu, J. C., Chen, H. Y. amd Yu, S. B. (2006) Quantitative analysis of surface coseismic faulting and postseismic creep accompanying the 2003, Mw = 6.5, Chengkung earthquake in eastern Taiwan. J. Geophys. Res., 111, B02405, doi:10. 1029/2005JB003612.
    連結:
  10. Shyu J. B. H., Sieh, K., Chen, Y. G., Liu, C. S. (2005) Neotectonic architecture of Taiwan and its implications for future large earthquakes.Geophys. Res., 110, B08402, doi:10.1029/2004JB003251,2005
    連結:
  11. Wu, Y. M., Chen, Y. G., Chang, C. H., Chung, L. H., Teng, T. L., Wu, Francis T., Wu, C. F. (2006) Seismogenic structure in a tectonic zone: With new constraints form 2006 Mw 6.1 Taitung earthquake. Geophysical Research Letters, 33, L22305, doi:10.1029/2006GL027572, 2006.
    連結:
  12. Yu, S. B. and Liu, C. C. (1989) Fault creep on the central segment of the longitudinal valley fault, Eastern Taiwan. Proc. Geol. Soc. China, 32 (3), 209-231.
    連結:
  13. Yu, S. B. and Yu, G. K. (1991) Present-day crustal deformation in the Longitudinal Valley area, eastern Taiwan. TAICRUST Workshop Proc., Taipei, pp. 185-195.
    連結:
  14. Yu, S. B., Yu, G. K., Kuo, L. C., Lee, C. (1992) Crustal deformation in the southern Longitudinal Valley area, eastern Taiwan. Geol. Soc. China, 35, 219-230.
    連結:
  15. Yu, S. B., Chen, H. Y., Kuo, L. C., (1997) Velocity filed of GPS station in the Taiwan aera. Tectonophysics, 274, 41-59.
    連結:
  16. Yu, S. B., Kuo, L. C., (2001) Present-day crustal motion along the Longitudinal Valley aera, eastern Taiwan. Tectonophysics, 333, 199-217.
    連結:
  17. 參考文獻
  18. 內政部 (2001) 一等水準測量作業規範,內政部,共26頁。
  19. 石再添、張瑞津、黃朝恩、石慶得、楊貴三、孫林耀明 (1983) 台灣北部與東部活動斷層的地形學研究。台灣師範大學地理學研究報告,9,20-72頁。
  20. 朱傚祖和游明聖 (1997) 台東縱谷地震與斷層關係之研究。行政院國家科學委員會專題研究計畫成果報告,NSC-86-2116-M-047-002,共133頁。
  21. 余水倍 (1989) 台東縱谷斷層之地殼變形研究。國立中央大學地球物理研究所博士論文,共117頁。
  22. 李建成、朱傚祖、安朔葉、胡植慶 (2004) 台灣東部縱谷斷層的快速潛移特性及地質災害。2004年台灣活動斷層與地震災害研討會摘要,國立成功大學,11-18頁。
  23. 林啟文,石瑞銓,林燕慧 (2004) 台東縱谷南段的活動斷層特性研究。經濟部中央地質調查所特刊,第15號,161?-174頁。
  24. 徐鐵良 (1956) 台灣東部海岸山脈地質。台灣省地質調查所彙刊,第八號,15-41頁。
  25. 張嘉強 (1987) 精密水準測量中重力與大氣折射之系統誤差研究,國立成功大學測量工程研究所論文,共60頁。
  26. 國立成功大學(2001) 一等一級水準網測量督導查核工作總報告書。
  27. 陳文山 (1996) 臺灣東部海岸山脈地質。經濟部中央地質調查所出版,共101頁。
  28. 曾清涼、儲慶美 (1999) GPS衛星測量原理與應用,第二版,國立成功大學資訊研究中心。
  29. 劉啟清 (1986) 精密水準測量之系統誤差,第五屆測量學術及應用研討會論文集,F1-F25頁
  30. 鐘惠玲、劉慶怡、紀南光、姜彥麟、詹瑜璋、李建成 (2004) 台東鹿野斷區河階變形特徵與斷層活動之關係, 「台灣之第四紀」第十屆研討會。
  31. Barrier, E., Angelier, J., Chu, H. T., Teng, L. S. (1982) Tectonic analysis of compressional structure in an active collision zone: the deformation of the Pinanshan conglomerates, eastern Taiwan. Proceedings of the Geol. Soc. China, 25, 123-138.
  32. Lee, J. C., Angelier, J. (1993) Localisation des d?formations active et traitements des donn?es g?od?siques: ? example de la faille de la Vall?e Longitudinal, Ta?wan. Bull. Soc. G?ol. Fr. 164, 533-570.
  33. Ooe, G. (1939) Geologic map of Taiwan: Taito sheet: Government General of Taiwan.
  34. Yu, S. B. and Liu, C. C. (1986) Coseismic deformation associated with the May 1986 Hualien earthquake. Bull. Inst. Earth Sci., Acad. Sin., 6, 73-84.
  35. Zhang, P. Z., Shen, Z., Wang, M., Gan., W, M., Gan, W., B?rgmann, R., Molnar, P., Wang, Q., Niu, Z., Sun, J., Wu, J., Hanrong, S., Xinzhao, Y. (2004) Continuous deformation of the Tibetan Plateau from global positioning system data. Geology, 32 (9) , 809-812.
Times Cited
  1. 黎偉聖(2011)。評估及應用GPS瞬時解於池上區域地殼變形監測。臺灣大學地質科學研究所學位論文。2011。1-131。 
  2. 顏郁捷(2008)。利用寬頻線性地震網資料研究2006年台東地震之發震構造與地震活動。臺灣大學地質科學研究所學位論文。2008。1-82。