[U-04] 地球惑星科学における高速過程を捉える

[U04-03] 滑りの不安定化における普遍的加速過程

★招待講演

*波多野 恭弘¹ (1.東京大学地震研究所)

キーワード：地震、核形成過程、先行現象

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 laboratory scale, it is shown that slip velocity increases in a power law manner tracing 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.