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GEOPHYSICAL RESEARCH LETTERS,
VOL. 36,
L06301,
6 PP., 2009
doi:10.1029/2008GL036772
Energy taken up by co-seismic chemical reactions during a large earthquake: An example from the 1999 Taiwan Chi-Chi earthquake
Department of Earth and Space Science, Graduate School of Science, Osaka University, Toyonaka, Japan
Department of Earth and Space Science, Graduate School of Science, Osaka University, Toyonaka, Japan
Kochi Institute for Core Sample Research, Japan Agency for Marine-Earth Science and Technology, Nankoku, Japan
Kochi Institute for Core Sample Research, Japan Agency for Marine-Earth Science and Technology, Nankoku, Japan
Department of Geosciences, National Taiwan University, Taipei, Taiwan
Frictional heat in a fault zone during earthquake slip transiently induces chemical reactions that may use energy released during the earthquake. We estimated the energy used by such reactions (E C ) by a numerical analysis incorporating frictional heat, thermal diffusion, chemical kinetics, and energy conservation, and found that E C has an auto-feedback effect that inhibits temperature rise in fault zone. During the 1999 Taiwan Chi-Chi earthquake, estimated E C was 0.43 MJ/m2, corresponding to 0.79% of the frictional heat generated. This low percentage probably reflects the low initial concentrations of reactive materials. However, in the case of a fault with abundant reactive materials, E C could reach >50% of the frictional heat and the auto-feedback effect could be large. At this case E C is a nonnegligible component on earthquake energy budget and can affect fault mechanics.
Received 24 November 2008; accepted 22 January 2009; published 17 March 2009.
Citation: (2009), Energy taken up by co-seismic chemical reactions during a large earthquake: An example from the 1999 Taiwan Chi-Chi earthquake, Geophys. Res. Lett., 36, L06301, doi:10.1029/2008GL036772.
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