Characterization of slip zone associated with the 1999 Taiwan Chi-Chi earthquake: X-ray CT image analyses and microstructural observations of the Taiwan Chelungpu fault

Tetsuro Hirono; Masumi Sakaguchi; Kenshiro Otsuki; Hiroki Sone; Koichiro Fujimoto; Toshiaki Mishima; Weiren Lin; Wataru Tanikawa; Masaharu Tanimizu; Wonn Soh; En Chao Yeh; Sheng Rong Song

doi:10.1016/j.tecto.2007.12.002

Characterization of slip zone associated with the 1999 Taiwan Chi-Chi earthquake: X-ray CT image analyses and microstructural observations of the Taiwan Chelungpu fault

Tetsuro Hirono^*, Masumi Sakaguchi, Kenshiro Otsuki, Hiroki Sone, Koichiro Fujimoto, Toshiaki Mishima, Weiren Lin, Wataru Tanikawa, Masaharu Tanimizu, Wonn Soh, En Chao Yeh, Sheng Rong Song

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

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Abstract

To characterize the fault-related rocks within the Chelungpu fault, we performed X-ray computed tomography (CT) image analyses and microstructural observations of Hole B core samples from the Taiwan Chelungpu-fault Drilling Project. We identified the slip zone associated with the 1999 Chi-Chi earthquake, within the black gouge zone in the shallowest major fault zone, by comparison with previous reports. The slip zone was characterized by low CT number, cataclastic (or ultracataclastic) texture, and high possibility to have experienced a mechanically fluidized state. Taking these characteristics and previous reports of frictional heating in the slip zone into consideration, we suggested that thermal pressurization was the most likely dynamic weakening mechanism during the earthquake.

Original language	English
Pages (from-to)	63-84
Number of pages	22
Journal	Tectonophysics
Volume	449
Issue number	1-4
DOIs	https://doi.org/10.1016/j.tecto.2007.12.002
Publication status	Published - 2008 Mar 13
Externally published	Yes

Keywords

Chelungpu fault
Chi-Chi earthquake
Fault zone
Microstructure
X-ray CT

ASJC Scopus subject areas

Geophysics
Earth-Surface Processes

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10.1016/j.tecto.2007.12.002

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Hirono, T., Sakaguchi, M., Otsuki, K., Sone, H., Fujimoto, K., Mishima, T., Lin, W., Tanikawa, W., Tanimizu, M., Soh, W., Yeh, E. C., & Song, S. R. (2008). Characterization of slip zone associated with the 1999 Taiwan Chi-Chi earthquake: X-ray CT image analyses and microstructural observations of the Taiwan Chelungpu fault. Tectonophysics, 449(1-4), 63-84. https://doi.org/10.1016/j.tecto.2007.12.002

Hirono, T, Sakaguchi, M, Otsuki, K, Sone, H, Fujimoto, K, Mishima, T, Lin, W, Tanikawa, W, Tanimizu, M, Soh, W, Yeh, EC & Song, SR 2008, 'Characterization of slip zone associated with the 1999 Taiwan Chi-Chi earthquake: X-ray CT image analyses and microstructural observations of the Taiwan Chelungpu fault', Tectonophysics, vol. 449, no. 1-4, pp. 63-84. https://doi.org/10.1016/j.tecto.2007.12.002

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abstract = "To characterize the fault-related rocks within the Chelungpu fault, we performed X-ray computed tomography (CT) image analyses and microstructural observations of Hole B core samples from the Taiwan Chelungpu-fault Drilling Project. We identified the slip zone associated with the 1999 Chi-Chi earthquake, within the black gouge zone in the shallowest major fault zone, by comparison with previous reports. The slip zone was characterized by low CT number, cataclastic (or ultracataclastic) texture, and high possibility to have experienced a mechanically fluidized state. Taking these characteristics and previous reports of frictional heating in the slip zone into consideration, we suggested that thermal pressurization was the most likely dynamic weakening mechanism during the earthquake.",

keywords = "Chelungpu fault, Chi-Chi earthquake, Fault zone, Microstructure, X-ray CT",

author = "Tetsuro Hirono and Masumi Sakaguchi and Kenshiro Otsuki and Hiroki Sone and Koichiro Fujimoto and Toshiaki Mishima and Weiren Lin and Wataru Tanikawa and Masaharu Tanimizu and Wonn Soh and Yeh, {En Chao} and Song, {Sheng Rong}",

note = "Funding Information: We thank Kuo-Fong Ma, Jih-Hao Hung, and Chien-Ying Wang for their support in our analyses of Hole B core samples. We greatly thank Anne-Marie Boullier and one anonymous reviewer for their constructive comments, and we also thank Editor Kevin P Furlong and Mike Sandiford for editing this paper. This research was supported by the Japan Ministry of Education, Science, Sports and Culture, Grant-in-Aid for Young Scientists (B) 18740323, 2007. ",

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T1 - Characterization of slip zone associated with the 1999 Taiwan Chi-Chi earthquake

T2 - X-ray CT image analyses and microstructural observations of the Taiwan Chelungpu fault

AU - Hirono, Tetsuro

AU - Sakaguchi, Masumi

AU - Otsuki, Kenshiro

AU - Sone, Hiroki

AU - Fujimoto, Koichiro

AU - Mishima, Toshiaki

AU - Lin, Weiren

AU - Tanikawa, Wataru

AU - Tanimizu, Masaharu

AU - Soh, Wonn

AU - Yeh, En Chao

AU - Song, Sheng Rong

N1 - Funding Information: We thank Kuo-Fong Ma, Jih-Hao Hung, and Chien-Ying Wang for their support in our analyses of Hole B core samples. We greatly thank Anne-Marie Boullier and one anonymous reviewer for their constructive comments, and we also thank Editor Kevin P Furlong and Mike Sandiford for editing this paper. This research was supported by the Japan Ministry of Education, Science, Sports and Culture, Grant-in-Aid for Young Scientists (B) 18740323, 2007.

PY - 2008/3/13

Y1 - 2008/3/13

N2 - To characterize the fault-related rocks within the Chelungpu fault, we performed X-ray computed tomography (CT) image analyses and microstructural observations of Hole B core samples from the Taiwan Chelungpu-fault Drilling Project. We identified the slip zone associated with the 1999 Chi-Chi earthquake, within the black gouge zone in the shallowest major fault zone, by comparison with previous reports. The slip zone was characterized by low CT number, cataclastic (or ultracataclastic) texture, and high possibility to have experienced a mechanically fluidized state. Taking these characteristics and previous reports of frictional heating in the slip zone into consideration, we suggested that thermal pressurization was the most likely dynamic weakening mechanism during the earthquake.

AB - To characterize the fault-related rocks within the Chelungpu fault, we performed X-ray computed tomography (CT) image analyses and microstructural observations of Hole B core samples from the Taiwan Chelungpu-fault Drilling Project. We identified the slip zone associated with the 1999 Chi-Chi earthquake, within the black gouge zone in the shallowest major fault zone, by comparison with previous reports. The slip zone was characterized by low CT number, cataclastic (or ultracataclastic) texture, and high possibility to have experienced a mechanically fluidized state. Taking these characteristics and previous reports of frictional heating in the slip zone into consideration, we suggested that thermal pressurization was the most likely dynamic weakening mechanism during the earthquake.

KW - Chelungpu fault

KW - Chi-Chi earthquake

KW - Fault zone

KW - Microstructure

KW - X-ray CT

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Characterization of slip zone associated with the 1999 Taiwan Chi-Chi earthquake: X-ray CT image analyses and microstructural observations of the Taiwan Chelungpu fault

Abstract

Keywords

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