Nondestructive continuous physical property measurements of core samples recovered from hole B, Taiwan Chelungpu-Fault Drilling Project

Tetsuro Hirono, En Chao Yeh, Weiren Lin, Hiroki Sone, Toshiaki Mishima, Wonn Soh, Yoshitaka Hashimoto, 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, Tomomi Kondo, Masahiro Nishimura, Soichi MoriyaTomoyuki Tanaka, Toru Fujiki, Lena Maeda, Hiroaki Muraki, Toshikatsu Kuramoto, Kazuhiro Sugiyama, Toshikatsu Sugawara

Research output: Contribution to journalArticlepeer-review

38 Citations (Scopus)


The Taiwan Chelungpu-Fault Drilling Project was undertaken in 2002 to investigate the faulting mechanism of the 1999 Mw 7.6 Taiwan Chi-Chi earthquake. Hole B penetrated the Chelungpu fault, and core samples were recovered from between 948.42- and 1352.60-m depth. Three major zones, designated FZB1136 (fault zone at 1136-m depth in hole B), FZB1194, and FZB1243, were recognized in the core samples as active fault zones within the Chelungpu fault. Nondestructive continuous physical property measurements, conducted on all core samples, revealed that the three major fault zones were characterized by low gamma ray attenuation (GRA) densities and high magnetic susceptibilities. Extensive fracturing and cracks within the fault zones and/or loss of atoms with high atomic number, but not a measurement artifact, might have caused the low GRA densities, whereas the high magnetic susceptibility values might have resulted from the formation of magnetic minerals from paramagnetic minerals by frictional heating. Minor fault zones were characterized by low GRA densities and no change in magnetic susceptibility, and the latter may indicate that these minor zones experienced relatively low frictional heating. Magnetic susceptibility in a fault zone may be key to the determination that frictional heating occurred during an earthquake on the fault.

Original languageEnglish
Article numberB07404
JournalJournal of Geophysical Research: Solid Earth
Issue number7
Publication statusPublished - 2007 Jul 4

ASJC Scopus subject areas

  • Geophysics
  • Geochemistry and Petrology
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science


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