JpGU-AGU Joint Meeting 2017

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[JJ] Oral

S (Solid Earth Sciences) » S-SS Seismology

[S-SS17] [JJ] Fault Rheology and Earthquake Physics

Sat. May 20, 2017 1:45 PM - 3:15 PM A09 (Tokyo Bay Makuhari Hall)

convener:Takanori Matsuzawa(National Research Institute for Earth Science and Disaster Resilience), Takeshi Iinuma(National Research and Development Agency Japan Agency for Marine-Earth Science and Technology), Wataru Tanikawa(Japan Agency for Marine-Earth Science and Technology, Kochi Instutute for Core Sample Research), Hideki Mukoyoshi(Department of Geoscience Interdisciplinary Graduate School of Science and Engineering, Shimane University), Chairperson:Takeshi Iinuma(National Research and Development Agency Japan Agency for Marine-Earth Science and Technology), Chairperson:Tetsuro Hirono(Department of Earth and Space Science, Graduate School of Science, Osaka University)

2:15 PM - 2:30 PM

[SSS17-09] Sintering on a fault during an earthquake

TONOIKE NAOYA1, *Tetsuro Hirono1 (1.Department of Earth and Space Science, Graduate School of Science, Osaka University)

Keywords:Sintering, Fault

Frictional heating on a fault during earthquale slip induces various phenomena such as melting, thermal decomposition, and so on. In the case of the Taiwan Chelungpu fault which slipped at the 1999 Chi-Chi earthquake, disk-shaped black material was discovered within the fault zone, and was considered as a pseudotachylite on the basis of the development of hourglass and bubble structures. However, such structures are commonly observed in ceramisc. Here we demonstrated experimentary the sintering phenomenon on the syntetic and natural samples (montmorillonite, illite, and sedimentary host rock nearby the Chelungpu fault). We observed similar structure in the sample that heated at 800 C to those in the fault material. Thus, frictional heating induces not only melting but also sintering, which might affect the frictional behavior and strength recovery of a fault.