Japan Geoscience Union Meeting 2016

Presentation information


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

[S-CG63] Dynamics in mobile belts

Mon. May 23, 2016 5:15 PM - 6:30 PM Poster Hall (International Exhibition Hall HALL6)

Convener:*Yukitoshi Fukahata(Disaster Prevention Research Institute, Kyoto University), Norio Shigematsu(Research Institute of Earthquake and Volcano Geology, Geological Survey of Japan, National Institute of Advanced Industrial Science and Technology), Aitaro Kato(Graduate School of Environmental Studies, Nagoya University), Hikaru Iwamori(Geochemical Evolution Research Program, Japan Agency for Marine-Earth Science and Technology), Yasutaka Ikeda(Department of Earth and Planetary Science, Graduate School of Science, University of Tokyo), Toru Takeshita(Department of Natural History Sciences, Graduate School of Science, Hokkaido University)

5:15 PM - 6:30 PM

[SCG63-P16] Characteristics of dependency of frictional properties on after-slip propagation speed

*Keisuke Ariyoshi1, Toru Matsuzawa2, Akira Hasegawa2, Ryota Hino2, Takane Hori1 (1.Research and Development Center for Earthquake and Tsunami, Earthquake and Tsunami Forecasting System Research Group, Japan Agency for Marine-Earth Science and Technology (JAMSTEC), 2.Research Center for Prediction of Earthquakes and Volcanic Eruptions, Graduate School of Science, Tohoku University)

Keywords:rate- and state-dependent friction, effective normal stress, numerical modeling

We have investigated relations between the after-slip process, effective normal stress, and friction parameters for a rate- and state-dependent friction (RSF) law from the view of theoretical analysis. For Nagata-law of RSF, the results show that the after-slip propagation speed (APS) increases exponentially with the higher value of A(=aσ), where ‘a’ is a frictional parameter of RSF and σ is the effective normal stress. APS is approximately positive and negative proportional to the value of b and dc, respectively, where ‘b’ and ‘dc’ is also frictional parameter of RSF. We also check the dependency of frictional parameter ‘c’ of Nagata’s RSF law.