A seismic source model, which can explain diverse seismic phenomena including regular earthquake and slow earthquake, is being constructed. Geological observations have revealed that the structure and geometry of faults are spatially heterogeneous. Seismic observations have also revealed that slip distribution of regular earthquake is heterogeneous in various spatial scales. These observation implies that frictional property on the fault is spatial heterogeneous, which could be a key to explain diversity of seismic phenomena. Furthermore, result in the topic 1 is qualitatively consistent with the frictionally heterogeneous fault model. I'm studying the slip behavior of a frictionally heterogeneous fault.

① Modeling slow earthquake ： Yabe and Ide (2017, JGR)

Constructing a model, which can quantitatively explain from tectonic tremor to slow slip events.

② Modeling regular seismicity：Yabe and Ide (2018, GRL), Yabe and Ide (2018, EPS)

Because the frictionally heterogeneous fault mode can explain the regular earthquake as well, aftershocks and foreshocks are modeled with this model. Classical model, in which seismic patch for a event is represented by homogeneous frictional property, cannot explain those activities because some of them occur within the mainshock rupture area, which requires hierarchical nature in the frictional property. The frictional heterogeneity will be one of candidates explaining this hierarchical nature.