[S-SS12] Fault Rheology and Earthquake Physics

Mon. May 25, 2026 9:00 AM - 10:30 AM Exhibition Hall Special Setting (7) (Exhibition Hall 7&8, Makuhari Messe)

Chairperson:Sawai Michiyo(Chiba University), Okubo Kurama(National Research Institute for Earth Science and Disaster Resilience)

The goal of this session is to integrate theoretical, experimental, observational, and numerical perspectives from various fields such as seismology, geodesy, geology, mineralogy, and so on, to define what is known about earthquake source processes and the physical and chemical elementary processes of faulting. This session welcomes studies that address such issues as pre-, co-, and post-seismic processes, the rheology of seismogenic faults and fault rocks, laboratory experiments on elementary processes, numerical models based on frictional laws, and estimates of the stress field in the seismogenic zones. We also welcome studies on fault-zone drilling projects and in situ stress measurements. Through discussions in both Japanese and English, this session promotes the mutual understanding among research fields and interdisciplinary research across all generations. We also encourage participants to communicate and present in English for international interactions. Therefore, presentations may be given in either English or Japanese, although all slides/posters must be written in English (with optional Japanese annotation).

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9:00 AM - 9:15 AM

[SSS12-13] A Calibrated Comparison of Methylene Blue Adsorption and XRD RockJock Methods Using Kunigel V1 Bentonite to Quantify Smectite in Neodani Fault Gouge: Evaluating methods to measure clay minerals in fault zones.

*Auxilio Bosco de Sousa¹, Tomoyuki Ohtani² (1. Graduate School of Science and Engineering, Gifu University, 2. Department of Civil Engineering, Gifu University)

9:15 AM - 9:30 AM

[SSS12-14] Effects of Microbial Fe(III) Reduction on Frictional Strength of Fe-rich Smectite

*Jiho Ahn¹, Insung Kang¹, Takehiro Hirose², Jinwook Kim¹ (1. Department of Earth System Sciences, Yonsei University, Seoul, 03722, Korea, 2. Kochi Institute for Core Sample Research(X-star), Japan Agency for Marine-Earth Science and Technology (JAMSTEC), Nankoku, Japan)

9:30 AM - 9:45 AM

[SSS12-15] Effect of Diagenesis on the frictional and hydraulic properties of Subducting Sediments in the Japan Trench

*Hayato Ito¹, Keishi Okazaki^1,2, Mizuki Ueda³, Yohei Hamada², Asuka Yamaguchi⁴ (1. Hiroshima University, 2. JAMSTEC, 3. University of Tsukuba, 4. Atmosphere and Ocean Research Institute, The University of Tokyo)

9:45 AM - 10:00 AM

[SSS12-16] Temperature and Pressure Dependence of the Frictional Properties of Limestone from Seamounts

*Mayuko Sekikawa¹, Hanaya Okuda², Manami Kitamura³, Miki Takahashi³, Asuka Yamaguchi⁴, Takehiro Hirose², Michiyo Sawai¹ (1. Graduate School of Science and Engineering, Chiba University, 2. Kochi Institute for Core Sample Research, Japan Agency for Marine-Earth Science and Technology, 3. National Institute of Advanced Industrial Science and Technology, 4. Atmosphere and Ocean Research Institute, The University of Tokyo)

10:00 AM - 10:15 AM

[SSS12-17] Imaging SAFOD Fault Gouge in Action: New insights on microstructural controls of Rate-and-State Friction through 4D Synchrotron Microtomography

*Nick Harpers¹, Eranga Gayanath Jayawickrama¹, Leander Fox¹, Arthur Ng¹, David Storz¹, Berit Schwichtenberg², Roberto Emanuele Rizzo³, Benoit Cordonnier⁴, Florian Fusseis¹ (1. Department of Geoscience and Geography, RWTH Aachen University, Germany, 2. Institute of Geosciences, The University of Bern, Switzerland, 3. Department of Earth Sciences, Utrecht University, the Netherlands, 4. Structure of Material Group, Experimental Division, European Synchrotron Radiation Facility, Grenoble, France)

10:15 AM - 10:30 AM

[SSS12-18] Observing the transition from flow to failure and shear localization in fault rock analogu through synchrotron X-ray operando shear experiments

*Miki Takahashi¹, Jun Muto², Sando Sawa², Masato Hoshino³, Kentaro Uesugi³ (1. Institute of Earthquake and Volcano Geology, Geological Survey of Japan, AIST, 2. Department of Earth Science, Graduate School of Science, Tohoku University, 3. Japan Synchrotron Radiation Research Institute)

Session information