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Watanabe, Tsuyoshi; Hiratsuka, Shinya*; Shimada, Koji
no journal, ,
The crustal fluid is one of the important factors in considering the seismogenic process because it reduces the fracture strength of rocks. To clarify the existence and the migration channels of such fluid will greatly contribute to disaster prevention, mitigation, and safety geological disposal. In this study, we conducted shear wave splitting analysis in the region from Fukushima to Ibaraki Prefectures to investigate the crustal fluid. As a result, we showed the spatio-temporal distributions of the crack orientations and anisotropic intensity. Then, we succeeded in capturing how crustal fluid propagated from deep to shallow areas along active faults or structures.
Murakami, Osamu
no journal, ,
In order to reveal the shear wave polarization anisotropy around the source area of the swarm earthquakes in the Noto peninsula, we applied shear-wave splitting analysis to the seismic records observed at the permanent seismic stations. The results at the station, SUZU, show the fast shear-wave polarizations almost parallel to the direction of the maximum regional compressional stress, while the ones at the station, N.SUZH, show the different direction from the direction of the maximum regional compressional stress.