Japan Geoscience Union Meeting 2019

Presentation information

[J] Poster

S (Solid Earth Sciences ) » S-SS Seismology

[S-SS14] Fault Rheology and Earthquake Physics

Wed. May 29, 2019 5:15 PM - 6:30 PM Poster Hall (International Exhibition Hall8, Makuhari Messe)

convener:Keishi Okazaki(Japan Agency for Marine-Earth Science and Technology), Hideki Mukoyoshi(Department of Geoscience Interdisciplinary Graduate School of Science and Engineering, Shimane University), Hiroyuki Noda(Kyoto University, Disaster Prevention Research Institute), Keisuke Yoshida(Tohoku University)

[SSS14-P02] Effects of talc content on frictional properties of quartz gouge

Risako Shirahige1, Inori Tatara1, *Ken-ichi Hirauchi1, Takato Takemura2 (1.Department of Geosciences, Faculty of Science, Shizuoka University, 2.Department of Earth and Environmental Sciences, College of Humanities and Sciences, Nihon University)

Keywords:friction, stick slip, fault weakening, phyllosilicate

Phyllosilicates have low coefficients of friction and an effect of weakening fault strength. To understand effects of talc content on frictional strength and sliding stability, we conducted frictional sliding experiments on dry gouge mixtures of quartz and talc at room humidity, room temperature, a normal stress of 10 MPa and sliding velocities of 0.66–2 µm/s, using a single direct-shear apparatus. The coefficient of friction for the mixture ranged from 0.18 to 0.69 and fell between pure quartz and talc values. The overall trend was a decrease in the coefficient of friction with increasing talc content. The velocity dependence of friction, (ab), ranged from −0.0018 to 0.0039 and increased with increasing talc content. The (ab) values are highest in the mixture with a talc content of 80 wt.%. For the mixture with talc contents below 10 wt.%, the (ab) values become negative, with the occurrence of slow to fast stick-slip behavior.