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Our research includes the study on earthquake, seismic wave propagation, and earth's internal structure as a division of the earth science. We most recently conducted a study on the short-wavelength structural heterogeneities in the crust and the upper mantle that cause the scattering and attenuation of high-frequency seismic waves. Seismology, which deals with the scientific and engineering topics relating to earthquake phenomena, including such as strong ground motions and long-period motions, is a key earth science in Japan where the tectonic activity is very high.