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Yamashita, Takuma*; Mitsuyasu, Yusuke*; Ono, Kenta*; Iwami, Satone*; Hayashi, Teppei*; Kino, Yasushi*; Sekine, Tsutomu*; Oka, Toshitaka; Takahashi, Atsushi*; Shimizu, Yoshinaka*; et al.
no journal, ,
no abstracts in English
Hayashi, Teppei*; Yamashita, Takuma*; Mitsuyasu, Yusuke*; Ono, Kenta*; Iwami, Satone*; Kino, Yasushi*; Sekine, Tsutomu*; Oka, Toshitaka; Takahashi, Atsushi*; Shimizu, Yoshinaka*; et al.
no journal, ,
no abstracts in English
Ishiniwa, Hiroko*; Davis, M.*; Johnson, T.*; Oka, Toshitaka
no journal, ,
no abstracts in English
Della, S. M.*; Trompier, F.*; Aboelezz, E.*; Ciesielski, B.*; D'Oca, M. C.*; Hayes, R.*; Juniewicz, M.*; Maltar-Strmecki, N.*; Marciniak, M.*; Marrale, M.*; et al.
no journal, ,
no abstracts in English
' center to seismic fault slips with various frictional power densitiesTanaka, Kiriha; Ohashi, Kiyokazu*; Muto, Jun*; Oka, Toshitaka
no journal, ,
ESR fault dating assumes that trapped charges in quartz in a fault material have been released by the last seismic fault slip (ESR signal zeroing). However, the physical condition and the underlying mechanism of the signal zeroing remain unclear. We have performed HVF experiments using ceramic host blocks with frictional power densities (FPDs) of 
, resulting in the incomplete signal zeroing for a trapped charge at the E' center. Moreover, HVF experiments with higher FPD were unsuccessful due to failures of the host blocks during the experiments. This study performed HVF experiments using tough titanium alloy host blocks for simulated quartz gouges with a slip rate of 
, a displacement of 
, and normal stresses of 
. During the experiment, temperature near a sliding surface was measured with thermocouples. ESR measurements to detect the trapped charge were conducted for gouges before and after the experiments. HVF experiments showed that the ESR intensity for the trapped charge increased with an increase in FPD of 
, followed by a decrease with a further increase of 
. The maximum temperature increased from approximately 
to 
with an increase in FPD of , followed by an increase up to 
with a further increase of . Based on previous results, it is likely that the number of the trapped charge increased due to grain fracturing, and then decreased due to larger frictional heating with increasing FPD. This study was unable to demonstrate the signal zeroing. However, the change in the number of a trapped charge by the last seismic fault slip can be quantified using FPD, suggesting that the age of the fault slip can be estimated with an assumption of incomplete signal zeroing.
Seito, Hajime*; Yokozuka, Eri*; Oka, Toshitaka; Yamasaki, Shota*; Kitatsuji, Yoshihiro; Nagasawa, Naotsugu*
no journal, ,
no abstracts in English