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Earthquake Source Physics, Seismotectonics
Earthquake generation processes are one of the most dynamic activities in the sold earth system, having a wide spectrum in space and time. We aim to develop a unified framework to physically describe the entire earthquake processes including stress accumulation and breaking of faults and deformations of interior and surfaces of the earth. We often uses numerical modeling and simulations to describe observed phenomena with underlying basic elements. We have been recently successful in development of a simple model that can describe a wide variety of slow earthquake phenomena. We also address underlying physical mechanisms in apparently complicated earthquakes phenomena such as triggering of large earthquakes, interactions between earthquakes and volcanic activities and geometrical structures of natural faults.
On the other hand, it is important to clarify histories of earthquakes occurred in the past to forecast earthquake generation in the future. We collaborate with geomorphologists and geologists to excavate paleo-seismological records by utilizing the numerical simulations studies based on the earthquake source physics.