JpGU-AGU Joint Meeting 2020

Presentation information

[J] Poster

S (Solid Earth Sciences ) » S-SS Seismology

[S-SS15] Fault Rheology and Earthquake Physics

convener:Keisuke Yoshida(Tohoku University), Keishi Okazaki(Japan Agency for Marine-Earth Science and Technology), Shunya Kaneki(Disaster Prevention Research Institute, Kyoto University), Hiroyuki Noda(Kyoto University, Disaster Prevention Research Institute)

[SSS15-P05] Evaluation of reactivity under hydrous condition on thermal maturity of carbonaceous materials as a proxy of seismic slip

*Keita Iwagaki1, Tetsuro Hirono1 (1.Department of Earth and Space Science, Graduate School of Science, Osaka University)

Keywords:carbonaceous material, IR spectrometry, Raman spectrometry

The thermal maturity of carbonaceous materials (CM) is often used for evaluation of the frictional heat recorded in faults. However, despite the fault is filled with water, the effect of water on the maturity of CM have not yet been investigated. Thus, here we performed heat treatments on lignite and bituminous coal with some different conditions of CM-water ratio, target temperature, heating rate, and heating holding time, and then evaluated the effect of water. The spectroscopic features by IR and Raman on the heated CMs with various conditions indicated no difference on the maturation (e.g., thermal breaking of aromatic C-H and graphitization). Therefore, the thermal maturation of CM as a proxy for frictional heating in faults is not necessary to consider the presence of water.