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Supplementary Information item 1: Mineral composition of Aji granite

Supplementary Information item 2: Calculation of temperature and gas viscosity at slip plane during friction tests

Supplementary Information item 3: Reproducibility of our results

Supplementary Information item 4: The thermomechanical properties of Aji granite were measured by a Thermomechanical Analyzer (TMA-60, Shimazu Corporation, Japan), and the calculated thermal property was used to estimate the thermal stress from the heating test (Fig. S5). We applied 0.1 MPa of normal stress during the thermomechanical test.

gfl12091-sup-0002-FigS1.jpgimage/jpg2754KFigure S1. Model calculation of temperature and viscosity change during friction tests.
gfl12091-sup-0003-FigS2.jpgimage/jpg1950KFigure S2. (a) Permeability as a function of normal stress for an intact specimen and for simulated fault rocks. (b) Gas flow rate as a function of differential pore pressure for simulated fault rocks.
gfl12091-sup-0004-FigS3.jpgimage/jpg2209KFigure S3. (a) Friction coefficient and (b) slip velocity as a function of cumulative slip displacement for a series of successive friction tests performed on the second pair of hollow granite specimens.
gfl12091-sup-0005-FigS4.jpgimage/jpg2231KFigure S4. Relative fracture transmissivity (a)–(c) as a function of slip velocity and (d)–(e) as a function of initial transmissivity.
gfl12091-sup-0006-FigS5.jpgimage/jpg863KFigure S5. Thermal expansion of Aji granite during heating.
gfl12091-sup-0007-TableS1.pdfapplication/PDF60KTable S1. Mineral composition of Aji granite (%) determined using the RockJock program (Eberl, 2003).
gfl12091-sup-0008-TableS2.pdfapplication/PDF60KTable S2. Thermal and physical properties used for numerical modeling of the temperature distribution during friction tests.

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