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Fault Mechanics Research Group

Investigation of the physico-chemical processes within a fault zone during an earthquake is of fundamental importance for understanding earthquake mechanics and faulting. The Fault Mechanics Research Group is aiming at clarifying co-seismic processes in earthquake faults, rupture propagation mechanisms and stress conditions around the fault by using core samples obtained from scientific drilling programs such as Taiwan Chelungpu-fault Drilling Project (TCDP) and Nankai Trough Seismogenic Zone Experiment (NanTroSEIZE).

Advanced research on physical property of core sample

The group is currently focusing on the studies of coseismic frictional behavior of a fault, measurements of various physical properties such as permeability, porosity and thermal conductivity at high-pressure and high-temperature conditions, estimations of three-dimensional in-situ stress, as well as cutting-edge geo-chemical analyses of natural and experimental fault rocks.

Development of advanced apparatus for physical-property measurements

We design and modify deformation and fluid flow apparatuses to try reproducing deformation conditions in nature as possible as we can and to determine physical properties of core samples more precisely.

Joint research and education

We collaborate with Graduate School of Science, Hiroshima University and China University of Geosciences in research and education for rock mechanics and fluid flow.


Group Leader
Weiren Lin
Deputy Group Leader
Takehiro Hirose
Senior Scientist
Wataru Tanikawa
Yohei Hamada



  • Tanikawa, W., Sakaguchi, M., Tadai, O., HIrose, T.(2010) Influence of fault slip rate on shear-induced permeability. Journal of Geophysical Research, in press. doi:10.1029/2009JB007013.
  • Han, R., HIrose, T., Shimamoto, T.(2010) Strong velocity-weakening and powder lubrication of simulated carbonate faults at seismic slip-rates. Journal of Geophysical Research, 115. B03412. doi:10.1029/2008JB006136.
  • Byrne, T. B. Lin, W., Tsutsumi, A., Yamamoto, Y., Lewis, J.C., Kanagawa, K., Kitamura, Y., Yamaguchi, A., Kimura, G.(2009), Anelastic strain recovery reveals extension across SW Japan subduction zone, Geophysical Research Letters. Vol. 36, L23310. doi:10.029/2009GL040749.
    • Stunitz, H., Keulen, N., Hirose, T., Heilbronner, R. (2010) Grain size distribution and microstructures of experimentally sheared granitoid gouge at coseismic slip rates criteria to distinguish seismic and aseismic faults? Journal of Structural Geology, Vol. 32, Issue 1, 59-69. doi:10.1016/j.jsg.2009.08.002.
    • Lin, W., Yeh, E.-C., Hung, J.-H., Haimson, B., Hirono, T. (2010) Localized rotation of principal stress faults and fractures determined from borehole breakouts in hole B of the Taiwan Chelungpu-fault Drilling Project (TCDP). Tectonophysics, Vol. 482, Issues 1-4, 82-91. doi:10.1016/j.tecto.2009.06.020.
    • Bezalel. H., Lin, W., Oku, H., Hung, J.-H., Song, S.-R. (2010) Integrating borehole breakout dimensions, strength criteria, and leak-off test results, to constrain the state of stress across the Chelungpu Fault, Taiwan. Tectonophysics, Vol. 482, Issues 1-4, 65-72. doi:10.1016/j.tecto.2009.05.016.


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