Japan Geoscience Union Meeting 2022

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[J] Oral

S (Solid Earth Sciences ) » S-CG Complex & General

[S-CG49] Rheology, fracture and friction in Earth and planetary sciences

Wed. May 25, 2022 3:30 PM - 5:00 PM 304 (International Conference Hall, Makuhari Messe)

convener:Shintaro Azuma(Department of Earth and Planetary Sciences, School of Science, Tokyo Institute of Technology), convener:Miki Tasaka(Shizuoka University), Ichiko Shimizu(Division of Earth and Planetary Sciences, Graduate School of Science, Kyoto University), convener:Osamu Kuwano(Japan Agency for Marine-Earth Science and Technology), Chairperson:Miki Tasaka(Shizuoka University)

4:00 PM - 4:15 PM

[SCG49-03] Simultaneous measurements of electrical resistivity and elastic-wave velocity of Aji granite during triaxial deformation until failure occurs

*Ikuo Katayama1, Yu Aoi1, Kazumasa Tanimoto1, Yuya Akamatsu1 (1.Department of Earth and Planetary Systems Science, Hiroshima University)

Keywords:Electrical resistivity, Elastic-wave velocity, Deformation experiment

We developed a simultaneous measurement system of electrical resistivity and elastic-wave velocity, and applied to Aji granite during triaxial deformation experiments. Experiments were carried out at confining pressure of 20-40 MPa, pore fluid pressure of 10 MPa and strain-rate of ~10-6 s-1. Electrical resistivity was measured by two-electrodes using impedance analyzer at frequency ranging from 10 Hz to 1 MHz, and elastic-wave velocities (Vp, Vs) were measured by the pulse transmission method at a resonant frequency of 2 MHz. Both resistivity and velocity change systematical during deformation, which is related to closure and developments of microcracks. In this presentation, I’d like to discuss how these physical properties are related to crack density and connectivity during deformation.