[O-01] Earth and Planetary Science Top Seminar

[O01-01] Earthquakes without shaking

★Invited Papers

*Satoshi Ide¹ (1.Department of Earth an Planetary Science, University of Tokyo)

Keywords:Earthquake, Slow Earthquake

Earthquake shaking originates from the fracturing and rapid slip of deep underground rocks. However, slip can also occur slowly. Such slow slip phenomena are referred to as 'slow slip events' or, when they generate small vibrations, 'tremors.' Collectively, these phenomena are sometimes called 'slow earthquakes.' The signals from slow earthquakes are extremely weak, and it was only in this century that we developed the capability to detect and analyze them. Initially discovered as a strange phenomenon, slow earthquakes have been found, through continued research, to be more widespread than regular earthquakes (which we may refer to as 'fast earthquakes') in the context of Earth's deformation processes. Furthermore, slow and fast earthquakes tend to occur in distinct regions, with slow earthquakes often surrounding areas where large earthquakes occur. This suggests that understanding slow earthquakes is essential for understanding and potentially forecasting large earthquakes. In this talk, I will introduce the discovery of slow earthquakes, our current understanding of them, and their relationship with large earthquakes."