Earthquake is slip on the fault. Recent dense and high-sensitivity observations have revealed that there is diversity in the seismic phenomena.

• Regular Earthquake → Earthquakes which we sometimes feel.
• Tsunami Earthquake → Earthquakes which generate larger tsunami than expected from the radiation of seismic wave.
• Afterslip → After occurrences of regular earthquakes, surrounding fault slips slowly decaying with time.
• Slow Earthquake → Spontaneous slow slip on the fault, which lasts from weeks to years.

Those diverse seismic phenomena occurs in subduction zones being interacted each other. For accurate understanding of seismicity in subduction zone, we need to understand the physical mechanism of this diversity. My research themes have been raised from following two fundamental questions.

1. What is the physical mechanism of slip diversity on the fault?
2. Which geological condition on the fault affects slip behavior?

I think we can discuss the possibility of probabilistic earthquake forecasting only after answering those fundamental questions. To explore answers for those questions, I have worked on following topic from various aspects.

Quantifications of Slow Earthquake Activity

Tectonic Environment Around the Plate Interface

Constructing a Unified Seismic Source Model

Possibilities for Probabilistic Earthquake Forecasting