Japan Geoscience Union Meeting 2019

Presentation information

[J] Oral

U (Union ) » Union

[U-04] Capture the fast process in Earth and planetary science

Wed. May 29, 2019 1:45 PM - 3:15 PM 103 (1F)

convener:Takashi Yoshino(Institute for Planetary Materials, Okayama University), Yoshinori Tange(Japan Synchrotron Radiation Research Institute), Chairperson:Takashi Yoshino(Okayama University), Yoshio Kono(愛媛大学地球深部ダイナミクスセンター), Yoshinori Tange

2:15 PM - 2:30 PM

[U04-03] Universal aspects of acceleration process toward unstable fast rupture

★Invited Papers

*Takahiro Hatano1 (1.Earthquake Research Institute, University of Tokyo)

Keywords:earthquake, slip nucleation, precursory phenomena

In this talk, we will elaborate the acceleration process of unstable slip on a model of earthquake fault. based on an empirical friction law that has been verified in the lab scale, it is shown that slip velocity increases in a power law manner resembling the inverse Omori law. This acceleration process has been known empirically, and is derivable theoretically for a class of simple systems. We will show that this power-law acceleration is realized in a wider class of systems including non-planer faults and random brittle media. Analysis on a mean-field model indicates saddle node bifurcation is responsible for the power law behavior.