Slip zone and energetics of a large earthquake from the Taiwan Chelungpu-fault Drilling Project

Kuo Fong Ma, Hidemi Tanaka, Sheng Rong Song, Chien Ying Wang, Jih Hao Hung, Yi Ben Tsai, Jim Mori, Yen Fang Song, En-Chao Yeh, Wonn Soh, Hiroki Sone, Li Wei Kuo, Hung Yu Wu

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Abstract

Determining the seismic fracture energy during an earthquake and understanding the associated creation and development of a fault zone requires a combination of both seismological and geological field data. The actual thickness of the zone that slips during the rupture of a large earthquake is not known and is a key seismological parameter in understanding energy dissipation, rupture processes and seismic efficiency. The 1999 magnitude-7.7 earthquake in Chi-Chi, Taiwan, produced large slip (8 to 10 metres) at or near the surface, which is accessible to borehole drilling and provides a rare opportunity to sample a fault that had large slip in a recent earthquake. Here we present the retrieved cores from the Taiwan Chelungpu-fault Drilling Project and identify the main slip zone associated with the Chi-Chi earthquake. The surface fracture energy estimated from grain sizes in the gouge zone of the fault sample was directly compared to the seismic fracture energy determined from near-field seismic data. From the comparison, the contribution of gouge surface energy to the earthquake breakdown work is quantified to be 6 per cent.

Original languageEnglish
Pages (from-to)473-476
Number of pages4
JournalNature
Volume444
Issue number7118
DOIs
Publication statusPublished - 2006 Nov 23

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Earthquakes
Taiwan
Rupture

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Ma, K. F., Tanaka, H., Song, S. R., Wang, C. Y., Hung, J. H., Tsai, Y. B., ... Wu, H. Y. (2006). Slip zone and energetics of a large earthquake from the Taiwan Chelungpu-fault Drilling Project. Nature, 444(7118), 473-476. https://doi.org/10.1038/nature05253

Slip zone and energetics of a large earthquake from the Taiwan Chelungpu-fault Drilling Project. / Ma, Kuo Fong; Tanaka, Hidemi; Song, Sheng Rong; Wang, Chien Ying; Hung, Jih Hao; Tsai, Yi Ben; Mori, Jim; Song, Yen Fang; Yeh, En-Chao; Soh, Wonn; Sone, Hiroki; Kuo, Li Wei; Wu, Hung Yu.

In: Nature, Vol. 444, No. 7118, 23.11.2006, p. 473-476.

Research output: Contribution to journalArticle

Ma, KF, Tanaka, H, Song, SR, Wang, CY, Hung, JH, Tsai, YB, Mori, J, Song, YF, Yeh, E-C, Soh, W, Sone, H, Kuo, LW & Wu, HY 2006, 'Slip zone and energetics of a large earthquake from the Taiwan Chelungpu-fault Drilling Project', Nature, vol. 444, no. 7118, pp. 473-476. https://doi.org/10.1038/nature05253
Ma KF, Tanaka H, Song SR, Wang CY, Hung JH, Tsai YB et al. Slip zone and energetics of a large earthquake from the Taiwan Chelungpu-fault Drilling Project. Nature. 2006 Nov 23;444(7118):473-476. https://doi.org/10.1038/nature05253
Ma, Kuo Fong ; Tanaka, Hidemi ; Song, Sheng Rong ; Wang, Chien Ying ; Hung, Jih Hao ; Tsai, Yi Ben ; Mori, Jim ; Song, Yen Fang ; Yeh, En-Chao ; Soh, Wonn ; Sone, Hiroki ; Kuo, Li Wei ; Wu, Hung Yu. / Slip zone and energetics of a large earthquake from the Taiwan Chelungpu-fault Drilling Project. In: Nature. 2006 ; Vol. 444, No. 7118. pp. 473-476.
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