Core description and characteristics of fault zones from Hole-A of the Taiwan Chelungpu-Fault Drilling Project

En-Chao Yeh, Hiroki Sone, Taichi Nakaya, Ka Hao Ian, Sheng Rong Song, Jih Hao Hung, Weiren Lin, Tetsuro Hirono, Chien Ying Wang, Kuo Fong Ma, Wonn Soh, Masataka Kinoshita

Research output: Contribution to journalArticle

40 Citations (Scopus)

Abstract

Taiwan Chelungpu-fault Drilling Project was conducted in drill site Dakeng, Taichung City of central western Taiwan during 2004 - 2005 principally to investigate the rupture mechanism in the northern segment of the Chi-Chi earthquake of 21 September 1999, and also to examine regional stratigraphy and tectonics. Core examination (500 - 1800 m) of Hole-A gave profound results aiding in illustrating the lithologic column, deformation structure, and architectural pattern of fault zones along the borehole. Lithology column of Hole-A was identified downward as the Cholan Formation (500 - 1027 m), Chinshui Shale (1027 - 1268 m), Kueichulin Formation (1268 - 1712 m), and back to the Cholan Formation (1712 - 2003 m) again. A dramatic change is observed regarding sedimentation age and deformation structure around 1712 m. Along the core, most bedding dips 30° toward N105°. Around 1785 m, bedding dip jumps up to 70° until the bottom of borehole. Five structure groups of different orientations (dip direction/dip) are observed throughout the core. Based on the orientation and sense of shear, they are categorized as thrust (105/30), left-lateral fault (015/30 - 80), right-lateral fault (195/30 - 80), normal fault (105/5 - 10), and backthrust (285/40 - 50). Ten fault zones have been recognized between 500 and 2003 m. We interpret the fault zone located at around 1111 m as being the most likely candidate for rupture deformation during Chi-Chi earthquake. The fault zone seated around 1712 m is recognized as the Sanyi fault zone which is 600 m beneath the Chelungpu fault zone. Ten fault zones including thrust faults, strike-slip faults and backthrust are classified as the Chelungpu Fault System (<1250 m) and the Sanyi Fault System (>1500 m). According to the deformation textures within fault zones, the fault zones can be categorized as three types of deformation: distinct fracture deformation, clayey-gouge deformation, and soft-rock deformation. Fracture deformation is dominant within the Chelungpu Fault System and abother two architectures prevail in the Sanyi Fault System. The fracture deformation pattern is asymmetric, which depended the shear sense of fault zone. From the core examination of TCDP Hole-A, the lithology plays an important role in controlling the location and deformation of fault zones.

Original languageEnglish
Pages (from-to)327-357
Number of pages31
JournalTerrestrial, Atmospheric and Oceanic Sciences
Volume18
Issue number2
DOIs
Publication statusPublished - 2007 Jun 1

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fault zone
drilling
dip
rupture
lithology
project
borehole
earthquake
soft rock
thrust fault
strike-slip fault
normal fault
shale
stratigraphy
thrust
texture
sedimentation
tectonics

Keywords

  • Chelungpu fault
  • Chi-Chi earthquake
  • Core description
  • Deformation structure
  • Sanyi fault

ASJC Scopus subject areas

  • Oceanography
  • Atmospheric Science
  • Earth and Planetary Sciences (miscellaneous)

Cite this

Core description and characteristics of fault zones from Hole-A of the Taiwan Chelungpu-Fault Drilling Project. / Yeh, En-Chao; Sone, Hiroki; Nakaya, Taichi; Ian, Ka Hao; Song, Sheng Rong; Hung, Jih Hao; Lin, Weiren; Hirono, Tetsuro; Wang, Chien Ying; Ma, Kuo Fong; Soh, Wonn; Kinoshita, Masataka.

In: Terrestrial, Atmospheric and Oceanic Sciences, Vol. 18, No. 2, 01.06.2007, p. 327-357.

Research output: Contribution to journalArticle

Yeh, E-C, Sone, H, Nakaya, T, Ian, KH, Song, SR, Hung, JH, Lin, W, Hirono, T, Wang, CY, Ma, KF, Soh, W & Kinoshita, M 2007, 'Core description and characteristics of fault zones from Hole-A of the Taiwan Chelungpu-Fault Drilling Project', Terrestrial, Atmospheric and Oceanic Sciences, vol. 18, no. 2, pp. 327-357. https://doi.org/10.3319/TAO.2007.18.2.327(TCDP)
Yeh, En-Chao ; Sone, Hiroki ; Nakaya, Taichi ; Ian, Ka Hao ; Song, Sheng Rong ; Hung, Jih Hao ; Lin, Weiren ; Hirono, Tetsuro ; Wang, Chien Ying ; Ma, Kuo Fong ; Soh, Wonn ; Kinoshita, Masataka. / Core description and characteristics of fault zones from Hole-A of the Taiwan Chelungpu-Fault Drilling Project. In: Terrestrial, Atmospheric and Oceanic Sciences. 2007 ; Vol. 18, No. 2. pp. 327-357.
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AU - Yeh, En-Chao

AU - Sone, Hiroki

AU - Nakaya, Taichi

AU - Ian, Ka Hao

AU - Song, Sheng Rong

AU - Hung, Jih Hao

AU - Lin, Weiren

AU - Hirono, Tetsuro

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AU - Ma, Kuo Fong

AU - Soh, Wonn

AU - Kinoshita, Masataka

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N2 - Taiwan Chelungpu-fault Drilling Project was conducted in drill site Dakeng, Taichung City of central western Taiwan during 2004 - 2005 principally to investigate the rupture mechanism in the northern segment of the Chi-Chi earthquake of 21 September 1999, and also to examine regional stratigraphy and tectonics. Core examination (500 - 1800 m) of Hole-A gave profound results aiding in illustrating the lithologic column, deformation structure, and architectural pattern of fault zones along the borehole. Lithology column of Hole-A was identified downward as the Cholan Formation (500 - 1027 m), Chinshui Shale (1027 - 1268 m), Kueichulin Formation (1268 - 1712 m), and back to the Cholan Formation (1712 - 2003 m) again. A dramatic change is observed regarding sedimentation age and deformation structure around 1712 m. Along the core, most bedding dips 30° toward N105°. Around 1785 m, bedding dip jumps up to 70° until the bottom of borehole. Five structure groups of different orientations (dip direction/dip) are observed throughout the core. Based on the orientation and sense of shear, they are categorized as thrust (105/30), left-lateral fault (015/30 - 80), right-lateral fault (195/30 - 80), normal fault (105/5 - 10), and backthrust (285/40 - 50). Ten fault zones have been recognized between 500 and 2003 m. We interpret the fault zone located at around 1111 m as being the most likely candidate for rupture deformation during Chi-Chi earthquake. The fault zone seated around 1712 m is recognized as the Sanyi fault zone which is 600 m beneath the Chelungpu fault zone. Ten fault zones including thrust faults, strike-slip faults and backthrust are classified as the Chelungpu Fault System (<1250 m) and the Sanyi Fault System (>1500 m). According to the deformation textures within fault zones, the fault zones can be categorized as three types of deformation: distinct fracture deformation, clayey-gouge deformation, and soft-rock deformation. Fracture deformation is dominant within the Chelungpu Fault System and abother two architectures prevail in the Sanyi Fault System. The fracture deformation pattern is asymmetric, which depended the shear sense of fault zone. From the core examination of TCDP Hole-A, the lithology plays an important role in controlling the location and deformation of fault zones.

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KW - Chelungpu fault

KW - Chi-Chi earthquake

KW - Core description

KW - Deformation structure

KW - Sanyi fault

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