講演情報
[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.