Articles | Volume 11, issue 4
https://doi.org/10.5194/se-11-1399-2020
https://doi.org/10.5194/se-11-1399-2020
Research article
 | 
26 Jul 2020
Research article |  | 26 Jul 2020

Frictional slip weakening and shear-enhanced crystallinity in simulated coal fault gouges at slow slip rates

Caiyuan Fan, Jinfeng Liu, Luuk B. Hunfeld, and Christopher J. Spiers

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Latest update: 22 May 2024
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Short summary
Coal is an important source rock for natural gas recovery, and its frictional properties play a role in induced seismicity. We performed experiments to investigate the frictional properties of bituminous coal, and our results show that the frictional strength of coal became significantly weakened with slip displacement, from a peak value of 0.5 to a steady-state value of 0.3. This may be caused by the development of shear bands with internal shear-enhanced molecular structure.