High magnetic susceptibility of fault gouge within Taiwan Chelungpu fault: Nondestructive continuous measurements of physical and chemical properties in fault rocks recovered from Hole B, TCDP

Tetsuro Hirono, Weiren Lin, En Chao Yeh, Wonn Soh, Yoshitaka Hashimoto, Hiroki Sone, Osamu Matsubayashi, Kan Aoike, Hisao Ito, Masataka Kinoshita, Masafumi Murayama, Sheng Rong Song, Kuo Fong Ma, Jih Hao Hung, Chien Ying Wang, Yi Ben Tsai

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Abstract

The Taiwan Chelungpu-fault Drilling Project (TCDP) was undertaken in 2002 to investigate the faulting mechanism of the 1999 Taiwan Chi-Chi earthquake. Hole B penetrated the Chelungpu fault, and recovered core samples from between 948.42 m and 1352.60 m depth. Three zones, marked 1136mFZ, 1194mFZ and 1243mFZ, were recognized in the core samples as active fault-zones within the Chelungpu fault. Multi-Sensor Core Logger measurements revealed lower densities and higher magnetic susceptibilities within the black gouge zones in all three fault zones. Even though the fault zone that slipped during the 1999 earthquake has not been identified, higher magnetic susceptibilities indicate that frictional heating has taken place in the Chelungpu fault.

Original languageEnglish
Article numberL15303
JournalGeophysical Research Letters
Volume33
Issue number15
DOIs
Publication statusPublished - 2006 Aug 1

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ASJC Scopus subject areas

  • Geophysics
  • Earth and Planetary Sciences(all)

Cite this

Hirono, T., Lin, W., Yeh, E. C., Soh, W., Hashimoto, Y., Sone, H., Matsubayashi, O., Aoike, K., Ito, H., Kinoshita, M., Murayama, M., Song, S. R., Ma, K. F., Hung, J. H., Wang, C. Y., & Tsai, Y. B. (2006). High magnetic susceptibility of fault gouge within Taiwan Chelungpu fault: Nondestructive continuous measurements of physical and chemical properties in fault rocks recovered from Hole B, TCDP. Geophysical Research Letters, 33(15), [L15303]. https://doi.org/10.1029/2006GL026133