1:45 PM - 2:00 PM
[SSS17-07] Experimental evidence for effects of heating rate on thermal maturation process of carbonaceous materials during earthquake slip
Keywords:Frictional heat, Carbonaceous materials, Heating rate, Spectrometry
In this study, we have conducted heating experiments with two different heating rate (~1 and ~100 °C s–1) on carbonaceous materials retrieved from an ancient plate-subduction fault, and carried out IR and Raman spectroscopies, and py-GC/MS analysis to examine whether heating rate could affect the maturation process of carbonaceous materials. Results showed that maturity of carbonaceous materials after heating with 100 °C s–1 is lower than that after heating with 1 °C s–1. By performing numerical simulation based on one-dimentional thermal diffusion equation, we have re-evaluated maximum temperature of the targeted fault to possibly reach 900 °C during past earthquakes, which is much higher than that estimated in the previous study (600 °C). We concluded that maturation of carbonaceous materials is strongly affected by heating rate, and such effects must be considered when we estimate maximum temperature from carbonaceous materials.