Oral Session

C-6: Fluid-rock interactions during slow and fast earthquakes.

2023年8月19日(土) 09:00 〜 12:30 ROOM2 (Meeting Room 2)

Chairman:Kohtaro Ujiie(University of Tsukuba)、Asuka Yamaguchi(The University of Tokyo)、Makoto Otsubo(AIST)

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09:00 〜 09:30

[OC6-01] Trace element and isotope constraint on slab-derived fluids involved in slow and fast earthquakes

*Tsuyoshi Ishikawa¹ (1. JAMSTEC (Japan))

09:30 〜 09:45

[OC6-02] Pressure and temperature conditions of deep tremor in Nankai subduction zones and hydration and carbonation of the mantle wedge

*Tatsuhiko Kawamoto¹, Tomohiro Inukai¹, Ryoya Ikuta¹ (1. Shizuoka University (Japan))

09:45 〜 10:00

[OC6-03] Is the periodical CO₂ degassing in extensional tectonic areas depending on Lunar Declination?

*Pierpaolo Zuddas¹, Fernando Lopes (1. SORBONNE UNIVERSITE (France))

10:00 〜 10:15

[OC6-04] Geochemical evidence of seawater percolation into subducting pelagic siliceous sediments

*Asuka Yamaguchi¹, Hitomi Mizuno¹, Hanaya Okuda^1,2, Takashi Sano³, Akira Ijiri⁴, Minoru Ikehara⁵ (1. Atmosphere and Ocean Research Institute, the University of Tokyo (Japan), 2. Kochi Institute for Core Sample Research, JAMSTEC (Japan), 3. National Museum of Nature and Science,Tokyo (Japan), 4. Graduate School of Maritime Sciences, Kobe University (Japan), 5. Marine Core Research Institute, Kochi University (Japan))

10:15 〜 10:30

[OC6-05] Estimating pore fluid pressure from geometrical characteristics of extensional mineral veins

*Makoto Otsubo¹, Kohtaro Ujiie², Ayumu Miyakawa¹ (1. Geological Survey of Japan/AIST (Japan), 2. University of Tsukuba (Japan))

Coffee break (10:30 〜 10:45)

10:45 〜 11:00

[OC6-06] Slow stress-drop due to sintering of feldspar in granitoids during faulting under hydrothermal condition

*Miki Takahashi¹, Manami Kitamura¹, Norio Shigematsu¹ (1. Geological survey of Japan, National Institute of Advanced Industrial Science and Technology (Japan))

11:00 〜 11:15

[OC6-07] Experimental investigation of reaction-induced weakening and embrittlement: origin of the intermediate-depth earthquakes and the spectrum of slip behaviors at subduction zones?

*Keishi Okazaki¹ (1. Hiroshima University (Japan))

11:15 〜 11:30

[OC6-08] The role of mantle wedge alteration on seismic and aseismic behavior of subduction megathrusts

*Ken-ichi Hirauchi¹ (1. Shizuoka University (Japan))

11:30 〜 11:45

[OC6-09] Experimental constraints on the controlling mechanisms of tectonic tremors

*Timm John¹, Sandra Babinski¹, Julien Gasc², Jörn Kummerow¹, Oliver Plümper³, Alexandre Schubnel² (1. Institut für Geologische Wissenschaften, Freie Universität Berlin (Germany), 2. Laboratoire de Géologie, ecole normal supérieure paris (France), 3. Department of Earth Sciences, Utrecht University (Netherlands))

11:45 〜 12:00

[OC6-10] Dynamics of breccia formation underpin the series of co-seismic slip (EQ), elevated fluid activity, and mineralization

*Geri Agroli¹, Atsushi Okamoto¹, Masaoki Uno¹, Noriyoshi Tsuchiya¹ (1. Graduated School of Environmental Studies, Tohoku University (Japan))

12:00 〜 12:15

[OC6-11] Transient fluid flow in the subduction zone setting: Implications from the Oman Ophiolite

*Kazuki Yoshida¹, Ryosuke Oyanagi^2,3, Masao Kimura⁴, Oliver Plümper⁵, Mayuko Fukuyama⁶, Atsushi Okamoto¹ (1. Tohoku Univ. (Japan), 2. Kukoshikan Univ. (Japan), 3. Japan Agency for Marine-Earth Science and Technology (Japan), 4. High Energy Accelerator Research Organization (Japan), 5. Utrecht Univ. (Netherlands), 6. Akita Univ. (Japan))

12:15 〜 12:30

[OC6-12] Exploring the role of dynamic fluid flow along fractures in high-grade metamorphic rocks in controlling seismic events in the middle crust

*Diana Mindaleva¹, Masaoki Uno¹, Noriyoshi Tsuchiya¹ (1. GSES, Tohoku University (Japan))

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