Shear wave splitting analysis for the crust in Iwaki area, Fukushima Prefecture, northeast Japan, 2

Watanabe, Tsuyoshi ; Hiratsuka, Shinya*; Shimada, Koji   

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.